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This version (16 Jan 2014 03:06) was approved by Irvin.The Previously approved version (19 Dec 2013 03:03) is available.Diff

Using the ADP1051 Eighth Brick Power Module Reference Design

Features

Standard eighth (1/8) brick size
High power density
Full digital control
Compatible with DOSA second 1/8 brick digital connector
PMBus communication
Graphical user interface (GUI) software supported
Delayed hiccup overcurrent protection (OCP), overtemperature protection (OTP), overvoltage protection (OVP), and undervoltage lockout (UVLO)
Input voltage range: 36 V to 75 V
Output voltage: 12 V
Maximum output current: 20 A
Efficiency: typical 94.5% at full load

Applications

48 V telecom dc to dc power supply
Servers
Telecommunications systems

General Description

The eighth (1/8) brick power module is designed based on the standardized 1/8 brick format defined by the Distributed-power Open Systems Alliance (DOSA). This reference design implements the ADP1051, a digital controller for isolated power supply with PMBus Interface, to control the energy conversion from input to output. Because of the excellent performance of the ADP1051, this 1/8 brick power module achieves high reliability, efficiency, and integration.

This 1/8 brick power module offers a series of housekeeping functions, such as IOUT_OC, VOUT_OV, OT, VOUT_UV defined by PMBus, input UVLO, reverse current protection, short-circuit protection, and so forth.

Figure 1.

Figure 1. Eighth Brick Power Module

Power Module Specifications

Table 1.

Parameter Symbol Min Typ Max Unit Test Conditions
Input VoltageVIN364875V dc
Turn On Input VoltageVION 34 V dc
Turn Off Input VoltageVIOFF 32 V dc
Output Voltage Initial SettingVOI 12 V dc VIN = 48 V and IO = 20 A
OVP 14 V dc
Output Voltage Ripple 120 mV
Load Current IO 20A
Load Current Limit Threshold 22 A
Operation Temperature 2585ºCAirflow = 200 LFM or higher
OT 114 ºC
Efficiencyη 94.5 %VIN = 48 V and IO = 20 A
Switching FrequencyfSW 223 kHz
External Capacitance 330 10,000μF


List of Terminals


Table 2.

Terminal Name Description
JP1VIN+Input terminal for input power.
JP3VINGround for input power.
JP4VOUT+Positive terminal of output power.
JP8VOUTNegative terminal of output power.
JP7ON/OFFControl pin of the 1/8 brick. Negative logic.
JP10.5VOUTNegative sensing point. Connect to VOUT−.
JP10.6NCNot connected.
JP10.7VSENS+ Positive sensing point.
JP10.9NCNot connected.
JP10.10AGNDGround for control circuit.
JP10.11SDAData bus of the PMBus interface.
JP10.12PGPower-good signal pin. This pin (low level voltage) indicates that the unit is functioning abnormally. Open-drain ouput.
JP10.13SCLClock bus of the PMBus interface.
JP10.1410V_SEC10 V auxiliary power on the output side.
JP10.15ADDAddress selection pin. Follow the specification listed in the ADP1051 data sheet.

Test Setup

Test Equipment

The following equipment is required to complete the test procedure:

  • DC voltage source: an adjustable dc source that is capable of outputting 36 V dc to 75 V dc, with a minimum power rating of 300 W or greater.
  • DC multimeter: a four digits multimeter that is capable of handling an input voltage of 0 V dc to 80 V dc or higher.
  • Output load: a dc load that is capable of receiving 0 V dc to 16 V dc, 0 mA to 25 A, and 0 W to 300 W or greater.
  • Oscilloscope: 500 MHz full bandwidth is recommended.
  • Fan: 200 LFM forced air cooling.

Figure 4.|

Figure 4. Eighth Brick Power Module Recommended Setup



Figure 5. |

Figure 5. Outlook of the Eighth Brick Power Module (Top View, Not to Size)



Figure 6. |

Figure 6. Outlook of the Eighth Brick Power Module (Bottom View, Not to Size)


Test Procedure

Use the following steps to conduct the test procedure:

  1. Power up the brick.
    1. Connect the input terminals (JP1, JP3) to the input source and connect the output terminals (JP4, JP8) to the load.
    2. Place the resistor between the ADD pin (JP10.15) and AGND (JP10.10). Select the resistance based on the specification of the ADP1051 (see the ADP5051 data sheet).
    3. (Optional) Add a pull-up resistor (2.2 kΩ typical) between the PG pin (JP10.12) and an external dc source. The dc voltage of this dc source must not exceed 3.6 V.
    4. (Optional) Connect the SDA pin (JP10.11), SCL pin (JP10.13), and the AGND pin (JP10.10) to the PMBus interface if communication from the PMBus interface to other PMBus devices is necessary.
    5. Place an external aluminum capacitor of 330 μF (or greater) between the output terminals (JP4, JP8).
    6. Connect the ON/OFF pin (JP7) to ground for input power (JP3).
    7. Apply a dc voltage source (36 V dc ~ 75 V dc) between the input terminals (JP1, JP3).
  2. Shut down the brick.
    1. Shut down the input dc voltage source.
    2. Shut down the load.


Schematic, Bill of Materials, and PCB Layout

Figure 7. Schematic

Bill of Materials

Table 3. Bill of Materials

QuantityPart ReferencePart No.ValueDescriptionManufacturerPackage
5 C1, C2, C3, C4, C36 12061Z475KAT2A4.7 µF4.7 µF/100 V X7S MLCC AVX C1206
1 C5 C0402C101J1GACTU100 pF100 pF/100 V COG MLCC Kemet C0402
1 C6GRM188R72A104KA35100 nF100 nF/100 V X7R MLCCMurataC0603
6 C7, C8, C9, C11, C46, C51C1005X7R1C104KT100 nF100 nF/16 V X7R MLCCTDK C0402
6 C10, C14, C15, C18, C29, C49C1608X7R1C105KT1 µF1 µF/16 V X7R MLCCTDK C0603
1 C12 C1005C0G1H101JT100 pF100 pF/50 V COG MLCCTDKC0402
3 C16, C20, C30 C3216X7R1C106KT10 µF10 µF/16 V X7R MLCCTDKC1206
3 C17, C19, C25C3225X7R1C226K250AC22 µF22 µF/16V X7R MLCCTDKC1210
2 C21, C22GRM15XR71C472KA864.7 nF4.7 nF/16 V X7R MLCCMurataC0402
2 C23, C24C0603C333K1RACTU33 nF33 nF/100 V X7R MLCCKemetC0603
1 C26C1005X7S0J225K050BC2.2 µF2.2 µF/6.3 V X7S MLCCTDKC0402
1 C27C1005X7S0J474K050BB470 nF470 nF/6.3 V X7S MLCCTDKC0402
1 C28NCNCMLCCTDKC0402
1 C32GRM155R72A102KA011 nF1 nF/100 V X7R MLCCMurataC0402
2 C34, C35GRM155R71H103KA8810 nF10 nF/50 V X7R MLCCMurataC0402
2C43, C48C1608X6S1C475K080AC4.7 µF4.7 µF/16V X6S MLCCTDKC0603
1C47GRM155R71A683KA0168 nF68 nF/10 V X7R MLCCMurataC0402
1C50GRM155R71H821KA01820 pF820 pF/50 V X7R MLCCMurataC0402
1C52202R18W102KV4E1000 pF1000 pF/2000 V X7R MLCCJohanson Dielectrics, Inc.C1206
1C53C1005X7R1H221KT220 pF220 pF/50 V X7R MLCCTDKC0402
1C54GRM155R71H472KA012.2 nF2.2 nF/50 V X7R MLCCMurataC0402
2C59, C60C1005X7R1H102KT1 nF1 nF/50 V X7R MLCCTDKC0402
1C117GRM155R70J105KA121 µF1 µF/6.3 V X7R MLCCMurataC0402
4D1, D2, D27, D28BAS516BAS516100 V/0.25 A high speed diodeNXPSOD523
1D3PMEG2010AEBPMEG2010AEB20 V/1 A ultralow VF MEGA Schottky diodeNXPSOD523
1D18BZX585-B5V1BZX585-B5V15.1 V Zener diode, 2% NXPSOD523
2D21, D23MUH1PBMUH1PB100 V/1 A ultrafast diodeVishayMicroSMP
2D25, D26XBS053V15R XBS053V15R30 V/0.5 A Schottky diodeTOREXSOD523
1JP1 VIN+Pin
1JP3 VIN-Pin
1JP4 VOUT+Pin
1JP7 ON/OFFPin
1JP8 VOUT-Pin
1JP9 SHORTPINPin
1JP10 Pin Connector
1L1SPM5030-R20M0.20 µH0.20 µH/21 A inductorTDK5.2 mm × 5.0 mm × 3 mm
2L3, T6PC95RM6PC95RM6Embeded inductor, total 10 mm height, 0.34 mm airgapTDK
2M1, M5FDMS86350FDMS8635080 V/2.4 mR/80 A power MOSFETFairchildPower 56
4Q1, Q2, Q3, Q4FDMS86150FDMS86150100 V/4.85 mR/60 A power MOSFETFairchildPower 56
1Q5PEMZ1PEMZ150 V/0.1 A NPN/PNP general-purpose transistorsNXPSOT666
2Q7, Q8Si2337DSSi2337DS80 V/0.27 R/2.2 A P-channel power MOSFETVishaySOT-23
4R2, R4, R6, R8RC0402JR-0710KL10 kΩ10 kΩ 0402 SMD 5% generic resistorYageoR0402
5R15, R16, R52, R56, R64RC0402JR-075K1L5.1 kΩ5.1 kΩ 0402 SMD 5% generic resistorYageoR0402
2R19, R20RC0603JR-070RL0 Ω0 Ω 0603 SMD 5% generic resistorYageoR0603
1R21CSNL1206FT1L000.001 Ω1 mΩ 1206 SMD 1% current sensing resistorStackpole Electronics, Inc.R1206
1R23RC0402JR-070R0L0 Ω0 Ω 0402 SMD generic resistorYageoR0402
1R24RC0402FR-0711KL11 kΩ11 kΩ 0402 SMD 1% generic resistorYageoR0402
1R26RC0402FR-0723K2L23.2 kΩ23.2 kΩ 0402 SMD 1% generic resistorYageoR0402
4R27, R36, R39, R40RC0402JR-0712K2L2.2 kΩ2.2 kΩ 0402 SMD 5% generic resistorYageoR0402
2R28, R31PCF0402R4K99BT14.99 kΩ4.99 kΩ 0402 SMD 0.1% ultraprecision resistorWelwynR0402
1R29RC0402FR-0723K7L23.7 kΩ23.7 kΩ 0402 SMD 1% generic resistorYageoR0402
1R30RC0402FR-071R3L 1.3 Ω1.3 Ω 0402 SMD 1% generic resistorYageoR0402
2R32, R33RC0402FR-071KL1 kΩ1 kΩ 0402 SMD 1% generic resistorYageoR0402
2R34, R80RC0402JR-07680RL680 Ω680 Ω 0402 SMD 5% generic resistorYageoR0402
1R35RE0402DRE0711KL11 kΩ11 kΩ 0402 SMD 0.5% generic resistorYageoR0402
1R37RE0402DRE071KL1 kΩ1 kΩ 0402 SMD 0.5% generic resistorYageoR0402
3R38, R47, R55RC0402JR-071KL1 kΩ1 kΩ 0402 SMD 5% generic resistorYageoR0402
1R42PCF0402R10K0BT1 10 kΩ 10 kΩ 0402 SMD 0.1% ultraprecision resistorWelwynR0402
1R43RC0402FR-0716K5L16.5 kΩ16.5 kΩ 0402 SMD 1% generic resistorYageoR0402
1R46RC0402FR-078220KL220 kΩ220 kΩ 0402 SMD 1% generic resistorYageoR0402
1R49RC0402FR-0710KL 10 kΩ10 kΩ 0402 SMD 1% generic resistorYageoR0402
3R50, R54, R84,RC0402FR-07149K9L49.9 kΩ49.9 kΩ 0402 SMD 1% generic resistorYageoR0402
1R51RC0402FR-078K2L 8.2 kΩ8.2 kΩ 0402 SMD 1% generic resistorYageoR0402
1R53RC0402FR-075K1L 5.1 kΩ5.1 kΩ 0402 SMD 1% generic resistorYageoR0402
2R78, R81RC0402FR-07374KL374 kΩ374 kΩ 0402 SMD 1% generic resistorYageoR0402
1R79RC0402FR-0715KL15 kΩ15 kΩ 0402 SMD 1% generic resistorYageoR0402
1R82RC0402FR-074K64L4.64 kΩ4.64 kΩ0402 SMD 1% generic resistorYageoR0402
1R83RC0402FR-072K49L2.49 kΩ2.49 kΩ 0402 SMD 1% generic resistorYageoR0402
1R85RC0402FR-0751RL 51 Ω51 Ω 0402 SMD 1% generic resistorYageoR0402
1R86RC0402FR-071K5L1.5 kΩ1.5 kΩ 0402 SMD 1% generic resistorYageoR0402
1RT1NCP15WF104F03RC 100 kΩ100 kΩ 0402 SMD NTC resistorMurataR0402
1T1MA5401-AEMA5401-AEFlyback/buck transformer, 1:1CoilcraftSMT
1T4CU8965-ALCU8965-AL1:100 20 A CT, 1500VDC insulation voltageCoilcraftSMT
2U1, U4UCC27211DRMUCC27211120 V/4 A high-side and low-side gate driverTexas InstrumentsSON-8
1U2ADuM3210TRZADuM3210Dual-channel digital isolator, 2 inputsAnalog Devices, Inc.SOIC_N
2U3, U5ADP3654ARHZRLADP3654Dual 4 A MOSFET driverAnalog DevicesMINI_SO_EP
1U6UCC25230DRMTUCC2523012 V to 100 V input, 0.2 A output switching converterTexas InstrumentsSON-8
1U7PS2911-1PS2911-14-pin, ultrasmall package, flat lead optocouplerNEC4.6 mm × 2.5 mm × 2.1 mm
1U8MIC5213-3.3YC5MIC5213-3.3YC50.08 A/3.3 V LDOMicrelSC70-5
1U9TL431AQDCKTTL431AQDCKTVREF = 2.5 V; 1%Texas InstrumentsSC70
1U11ADP1051ACPZADP1051Digital controllerAnalog Devices, Inc.LFCSP



Printed Circuit Board (PCB) Layout

Figure 8. Top Layer


Figure 9. Layer 2


Figure 10. Layer 3


Figure 11. Layer 4


Figure 12. Layer 5


Figure 13. Layer 6


Figure 14. Layer 7


Figure 15. Layer 8


Figure 16. Layer 9


Figure 17. Layer 10


Figure 18. Layer 11


Figure 19. Layer 12


Figure 20. Layer 13


Figure 21. Layer 14


Figure 22. Layer 15


Figure 23. Bottom Layer

Standard DC-to-DC Test Report

Test Items Summary Tables

The specification in the test form is defined under 25°C and pass/fail is according to the specification. The characterizations derived using the following equipment:

  • Programmable power supply: Chroma 62012P-100-50
  • DC electronic load: Chroma 6314A and Chroma 63016A
  • Digital phosphor oscilloscope: Tektronix DPO4054
  • Current probe: Tektronix TCP0030
  • Multimeter: Agilent 34410A and FLUKE 117C


Table 4. Input Characteristics

Test Item Specification Result
Efficiency >94.5% when VIN = 48 V and IO = 20 APass
>94.5% when VIN = 48 V and IO = 10 APass
>91.5% VIN = 48 V and IO = 6 APass
Maximum Input Current <10 A when VIN = 36 V and IO = 20 APass
Input Idling Power <4 W when VIN = 48 V and IO = 0 A


Table 5. Output Characterization

Test Item Specification Result
Output Voltage Setpoint 11.88 V to 12.12 V Pass
Output Voltage Range 11.64 V to 12.36 V with VIN = 40 V to 75 V and IO = 0 A to 20 A Pass
Line Regulation <±2% with VIN = 40 V to 75 V and IO = 20 A Pass
Load Regulation <±3% with VIN = 48 V and IO = 0 A to 20 A Pass
Output Ripple and Noise <250 mV with 20 MHz bandwidth, VIN = 36 V to 75 V and IO = 0 A to 20 A
<500 mV with 1 GHz bandwidth, VIN = 48 V and IO = 20 A
Dynamic Load Response ΔVO < 600 mV and TSET < 200 µs with IO changes at a step of 10 A, 15 A, 10 A and a speed of 0.1 A/µsPass
ΔVO < 600 mV and TSET < 300 µs with IO changes at a step of 10 A, 15 A, 10 A and a speed of 1 A/µsPass
ΔVO < 600 mV and TSET < 200 µs with IO changes at a step of 2 A, 20 A, 2 A and a speed of 0.1 A/µsPass
Turn-On Transient TDSTART < 100 ms,TSTART < 100 ms, and ΔVOSHOOT < 5% VO with VIN = 36 V to 75 V and IO = 0 A to 20 A Pass
Turn-Off Transient Not specified Pass


Table 6. Protection

Test Item Specification Result
Input Undervoltage Protection Turns on the unit with VIN = 31 V to 35.5 V Pass
Turns off the unit with VIN = 30 V to 35 V Pass
Hysteresis between turn on and turn off should be higher than 1 VPass
Output Overvoltage Protection (OVP) Enable hiccup mode when VO triggers the OVP setting point within 14 V to 16 V with VIN = 48 VPass
Output Overcurrent Protection (OVC) Enable hiccup mode when IO triggers the OCP setting point within 22 A to 28 A with VIN = 36 V to 75 VPass
Output Short-Circuit Protection Ensure IO < 5 A and the output can be shorting continuously with enable hiccup mode Pass
Overtemperature Protection (OTP) Pass


Table 7. Monitoring

Test Item Specification Result
Input Voltage Detected Precision < ±1 V with VIN = 36 V to 75 V, IO = 0 A to 20 A Pass
Input Current Detected Precision < ±0.5 A with VIN = 36 V to 75 V, IO = 0 A to 20 A
Input Power Detected Precision < ±12 W with VIN = 36 V to 75 V, IO = 5 A to 20 A
Output Voltage Detected Precision < ±0.2 V with VIN = 36 V to 75 V, IO = 0 A to 20 A Pass
Output Current Detected Precision < ±1 A with VIN = 36 V to 75 V, IO = 0 A to 20 A Pass
Output Power Detected Precision < ±1 W with VIN = 36 V to 75 V, IO = 0 A to 20 A Pass
Board Thermal

Input Characterization

Input characterization data is available in Table 4.

Efficiency

Test Conditions

The unit operates under full input voltage and load range. Efficiency was measured or computed after warming up for a minimum of 10 minutes.

Pass/Fail Criteria

With VIN = 48 V and VO = 12 V, η > 94% when IO = 20 A.

Test result: Pass

Table 8. Efficiency

Specification (%)

Test Results (%)

Item VIN (V) Load (A) -40°C+25°C+85°C -40°C+25°C+85°C
Efficiency 48 20 >94 94.468

Figure 24. Eighth Brick Efficiency, ADP5051


Table 9.

VIN (V) IIN (A) VO (V) IO (A) η (%) VIN (V) IIN (A) VO (V) IO (A) η (%)
36.009 0.110 12.010 0.000 0.000 48.018 0.105 12.012 0.000 0.000
35.988 0.433 12.009 0.968 74.527 48.001 0.346 12.012 0.967 69.849
35.966 0.768 12.009 1.959 85.228 47.983 0.597 12.012 1.958 82.138
35.943 1.117 12.009 2.983 89.269 47.967 0.858 12.012 2.983 87.077
35.920 1.457 12.008 3.973 91.147 47.950 1.111 12.010 3.973 89.588
35.896 1.801 12.008 4.967 92.268 47.932 1.367 12.010 4.967 91.008
35.870 2.159 12.008 5.994 92.942 47.913 1.635 12.009 5.994 91.882
35.847 2.508 12.007 6.987 93.326 47.898 1.897 12.009 6.983 92.290
35.822 2.849 12.006 7.976 93.849 47.880 2.159 12.008 7.976 92.653
35.799 3.205 12.007 9.002 94.206 47.859 2.427 12.008 9.002 93.045
35.776 3.549 12.006 9.994 94.502 47.844 2.686 12.008 9.994 93.389
35.752 3.883 12.005 10.953 94.707 47.826 2.934 12.006 10.953 93.708
35.725 4.246 12.005 11.981 94.832 47.805 3.203 12.007 11.981 93.962
35.700 4.592 12.004 12.967 94.952 47.790 3.462 12.005 12.967 94.102
35.673 4.944 12.004 13.963 95.041 47.772 3.721 12.002 13.963 94.278
35.645 5.309 12.004 14.988 95.077 47.753 3.991 12.001 14.990 94.390
35.618 5.664 12.003 15.982 95.089 47.732 4.253 12.000 15.982 94.466
35.589 6.020 12.002 16.976 95.099 47.715 4.517 11.999 16.974 94.490
35.568 6.393 12.000 18.000 94.993 47.696 4.791 11.999 17.998 94.510
35.532 6.752 11.999 18.990 94.977 47.675 5.057 11.996 18.991 94.503
35.505 7.115 11.997 19.983 94.901 47.656 5.324 11.993 19.985 94.468
60.030 0.104 12.010 0.000 0.000 75.040 0.095 12.006 0.000 0.000
60.010 0.292 12.009 0.964 66.068 75.030 0.245 12.006 0.964 62.968
60.000 0.490 12.008 1.956 79.906 75.020 0.405 12.006 1.958 77.447
59.980 0.698 12.008 2.981 85.543 75.000 0.571 12.005 2.981 83.571
59.980 0.901 12.007 3.971 88.242 74.990 0.734 12.005 3.973 86.702
59.960 1.107 12.009 4.963 89.811 74.980 0.898 12.005 4.965 88.484
59.940 1.321 12.008 5.988 90.775 74.970 1.071 12.005 5.993 89.630
59.930 1.531 12.007 6.979 91.325 74.960 1.238 12.003 6.971 90.130
59.910 1.742 12.005 7.971 91.687 74.950 1.408 12.002 7.973 90.672
59.900 1.961 12.004 8.996 91.935 74.930 1.585 12.001 9.000 90.938
59.880 2.169 12.003 9.991 92.312 74.920 1.756 11.999 9.994 91.159
59.870 2.369 12.002 10.950 92.680 74.910 1.917 11.998 10.953 91.532
59.860 2.582 12.001 11.973 92.981 74.900 2.087 11.996 11.977 91.900
59.850 2.788 12.000 12.963 93.218 74.890 2.253 11.994 12.967 92.193
59.830 2.996 12.000 13.959 93.452 74.880 2.419 11.994 13.961 92.429
59.810 3.210 11.997 14.985 93.626 74.870 2.591 11.991 14.988 92.653
59.800 3.420 11.997 15.978 93.736 74.860 2.758 11.990 15.980 92.791
59.780 3.630 11.994 16.972 93.815 74.850 2.926 11.988 16.972 92.906
59.770 3.847 11.992 17.996 93.849 74.830 3.100 11.987 17.996 92.996
59.750 4.059 11.992 18.988 93.887 74.820 3.270 11.985 18.990 93.030
59.730 4.272 11.990 19.981 93.900 74.810 3.440 11.981 19.983 93.038


Maximum Input Current

Test Conditions

The unit was set at maximum load and the input voltage was set to the minimum value.

Pass/Fail Criteria

With IIN = 10 A when VIN = 36 V and IO = 20 A.

Test result: Pass

Table 10. Maximum Input Current

Specification (A)

Test Results (A)

Item VIN (V) Load (A) -40°C+25°C+85°C -40°C+25°C+85°C
IIN <36 20 <10 <10 <10 7.115

Input Idling Power

Test Conditions

The unit was set at no load with rated input voltage.

Pass/Fail Criteria

Pin <4 W when VIN = 48 V and IO = 0 A.

Test result:

Table 11. Input Idling Power

Specification (W)

Test Results (W)

Item VIN (V) Load (A) -40°C+25°C+85°C -40°C+25°C+85°C
PO <36 0 Not specified 3.957
PO 48 0 <4 5.018
PO 60 0 Not specified 6.243
PO 75 0 Not specified 7.091


Output Characterization

The test items summary for Output Characterization specifications is available in Table 4.

Output Voltage Setpoint

Test Condition

The unit was set at full load with rated input voltage.

Pass/Fail Criteria

11.88 V < VO < 12.12 V when VIN = 48 V and IO = 20 A.

Test result: Pass

Table 12. Output Voltage Setpoint

Specification (V)

Test Results (V)

Item VIN (V) Load (A) -40°C+25°C+85°C -40°C+25°C+85°C
VO 48 20 11.88 to 12.12 11.993

Output Voltage Range

Test Condition

The unit was operating under full input voltage and load range.

Pass/Fail Criteria

11.64 V < VO < 12.36 V when VIN = 36 V to75 V and IO = 0 A to 20 A.

Test result: Pass

Table 13. Output Voltage Range

Specification (V)

Test Results (V)

Item VIN (V) Load (A) -40°C+25°C+85°C -40°C+25°C+85°C
VO 36 0 11.64 to 12.36 12.010
VO 36 20 11.64 to 12.36 11.997
VO 48 0 11.64 to 12.36 12.012
VO 48 20 11.64 to 12.36 11.993
VO 60 0 11.64 to 12.36 12.010
VO 60 20 11.64 to 12.36 11.990
VO 75 0 11.64 to 12.36 12.006
VO 75 20 11.64 to 12.36 11.981

Line Regulation

Test Condition

The unit was operating under full input voltage range and maximum load.

Pass/Fail Criteria

11.76 V < VO < 12.24 V when VIN = 36 V to 75 V and IO = 20 A.

Test result: Pass

Table 14. Line Regulation

Specification (V)

Test Results (V)

Item VIN (V) Load (A) -40°C+25°C+85°C -40°C+25°C+85°C
VO 36 20 11.64 to 12.36 11.997
VO 48 20 11.64 to 12.36 11.993
VO 60 20 11.64 to 12.36 11.990
VO 75 20 11.64 to 12.36 11.981

Figure 25. Eighth Brick Line Regulation

Load Regulation

Test Condition

The unit was operating under rated input voltage range and full load range.

Pass/Fail Criteria

11.64 V < VO < 12.36 V when VIN = 36 V to 75 V and IO = 0 A to 20 A.

Test result: Pass

Table 15. Load Regulation

Specification (V)

Test Results (V)

Item VIN (V) Load (A) -40°C+25°C+85°C -40°C+25°C+85°C
VO 36 0 11.64 to 12.36 12.01
VO 36 2 11.64 to 12.36 12.009
VO 36 4 11.64 to 12.36 12.008
VO 36 6 11.64 to 12.36 12.008
VO 36 8 11.64 to 12.36 12.006
VO 36 10 11.64 to 12.36 12.006
VO 36 12 11.64 to 12.36 12.005
VO 36 14 11.64 to 12.36 12.004
VO 36 16 11.64 to 12.36 12.003
VO 36 18 11.64 to 12.36 12.000
VO 36 20 11.64 to 12.36 11.997
VO 48 0 11.64 to 12.36 12.012
VO 48 2 11.64 to 12.36 12.012
VO 48 4 11.64 to 12.36 12.010
VO 48 6 11.64 to 12.36 12.009
VO 48 8 11.64 to 12.36 12.008
VO 48 10 11.64 to 12.36 12.008
VO 48 12 11.64 to 12.36 12.007
VO 48 14 11.64 to 12.36 12.002
VO 48 16 11.64 to 12.36 12.001
VO 48 18 11.64 to 12.36 11.999
VO 48 20 11.64 to 12.36 11.993
VO 60 0 11.64 to 12.36 12.010
VO 60 2 11.64 to 12.36 12.008
VO 60 4 11.64 to 12.36 12.007
VO 60 6 11.64 to 12.36 12.008
VO 60 8 11.64 to 12.36 12.005
VO 60 10 11.64 to 12.36 12.003
VO 60 12 11.64 to 12.36 12.002
VO 60 14 11.64 to 12.36 12.000
VO 60 16 11.64 to 12.36 11.997
VO 60 18 11.64 to 12.36 11.994
VO 60 20 11.64 to 12.36 11.992
VO 75 0 11.64 to 12.36 12.006
VO 75 2 11.64 to 12.36 12.006
VO 75 4 11.64 to 12.36 12.005
VO 75 6 11.64 to 12.36 12.005
VO 75 8 11.64 to 12.36 12.002
VO 75 10 11.64 to 12.36 11.999
VO 75 12 11.64 to 12.36 11.996
VO 75 14 11.64 to 12.36 11.994
VO 75 16 11.64 to 12.36 11.990
VO 75 18 11.64 to 12.36 11.987
VO 75 20 11.64 to 12.36 11.981

Figure 26. Eighth Brick Load Regulation

Constant Current

Test Condition

Apply a CR load at the output terminals and decrease the loaded resistor.

Pass/Fail Criteria

Load current should limit under the IOUT_OC_LIMIT.

Figure 27. Eighth Brick Constant Current Mode

Output Ripple and Noise

Test Condition

Ripple voltage and noise were measured at the pins of the mating connector of which each output was decoupled by a ceramic (X7R) capacitor and an aluminum capacitor, as shown in following figure.

Figure 28. Decoupled Eighth Brick Power Module

Pass/Fail Criteria

VO p-p < 250 mV with 20 MHz signal bandwidth when VIN = 36 V to 75 V and IO = 0 A to 20 A; VO p-p < 500 mV with 1 GHz signal bandwidth when VIN = 48 V and IO = 20 A.

Test result: Pass

Table 16. Output Ripple and Noise

Specification (V)

Test Results (V)

Item VIN (V) Load (A) -40°C +25°C +85°C -40°C +25°C +85°C
VO p-p with 20 MHz Bandwidth 36 0 <250 <250 <250 58
VO p-p with 20 MHz Bandwidth 48 0 <250 <250 <250 92
VO p-p with 20 MHz Bandwidth 60 0 <250 <250 <250 120
VO p-p with 20 MHz Bandwidth 75 0 <250 <250 <250 126
VO p-p with 20 MHz Bandwidth 36 20 <250 <250 <250 58
VO p-p with 20 MHz Bandwidth 48 20 <250 <250 <250 86
VO p-p with 20 MHz Bandwidth 60 20 <250 <250 <250 104
VO p-p with 20 MHz Bandwidth 75 20 <250 <250 <250 122
VO p-p with 500 MHz Bandwidth 48 20 <500 110

Channel 1: VO AC-Coupled


500 MHz Signal Bandwidth when VIN = 48 V

Dynamic Load Response

Test Condition

The dynamic load response was evaluated by measuring the overshoot/undershoot (ΔVO) and the settling time (TSET) with load changes at the specified step and speed in full input voltage range.

Pass/Fail Criteria

ΔVO < 600 mV and TSET < 200 µs when Io changes at a step of 10 A, 15 A,10 A and a speed of 0.1 A/µs; ΔVO < 600 mV and TSET < 300 µs when Io changes at a step of 10 A, 15 A, 10 A and a speed of 1 A/µs; ΔVO < 600 mV when IO changes at a step of 2 A, 20 A, 2 A and a speed of 0.1 A/µs.

Test result: Pass

Table 17. Dynamic Load Response, Load Current Slew Rate is 0.1 A/µs

Specification (mV/µs)

Test Results (mV/µs)

Item VIN (V) Load (%) -40°C +25°C +85°C -40°C +25°C +85°C
ΔVO/TSET 36 50% to >75% 600/200 222/74
ΔVO/TSET 36 75% to >50% 600/200 234/77
ΔVO/TSET 48 50% to >75% 600/200 222/125
ΔVO/TSET 48 75% to >50% 600/200 222/115
ΔVO/TSET 60 50% to >75% 600/200 226/126
ΔVO/TSET 60 75% to >50% 600/200 214/133
ΔVO/TSET 75 50% to >75% 600/200 222/115
ΔVO/TSET 75 75% to >50% 600/200 210/132


Table 18. Dynamic Load Response, Load Current Slew Rate is 1 A/µs

Specification (mV/µs)

Test Results (mV/µs)

Item VIN (V) Load (%) -40°C +25°C +85°C -40°C +25°C +85°C
ΔVO/TSET 36 50% to >75% 600/300 278/60
ΔVO/TSET 36 75% to >50% 600/300 286/57
ΔVO/TSET 48 50% to >75% 600/300 302/109
ΔVO/TSET 48 75% to >50% 600/300 290/100
ΔVO/TSET 60 50% to >75% 600/300 302/107
ΔVO/TSET 60 75% to >50% 600/300 298/106
ΔVO/TSET 75 50% to >75% 600/300 318/105
ΔVO/TSET 75 75% to >50% 600/300 298/137



Table 19. Dynamic Load Response, Load Current Slew Rate is 0.1 A/µs

Specification (mV/µs)

Test Results (mV/µs)

Item VIN (V) Load (%) -40°C +25°C +85°C -40°C +25°C +85°C
ΔVO/TSET 36 10% to >100% 600/not specified 404/not specified
ΔVO/TSET 36 100% to >10% 600/not specified 340/not specified
ΔVO/TSET 48 10% to >100% 600/not specified 388/not specified
ΔVO/TSET 48 100% to >10% 600/not specified 324/not specified
ΔVO/TSET 60 10% to >100% 600/not specified 372/not specified
ΔVO/TSET 60 100% to >10% 600/not specified 324/not specified
ΔVO/TSET 75 10% to >100% 600/not specified 356/not specified
ΔVO/TSET 75 100% to >10% 600/not specified 316/not specified


Channel 1 (Blue): VO (AC-Coupled); Channel 4 (Green): IO Load Step = 10 A, 15 A, 10 A with a slew rate of 0.1 A/µs


Load Step: 10 A, 15 A, 10 A with a Slew Rate of 1 A/µs


Load Step: 2 A, 20 A, 2 A with a Slew Rate of 1 A/µs

Turn-On Transient

Test Condition

The unit was tested when the input voltage is applied.

Pass/Fail Criteria

TDSTART (start delay time from when the VIN is applied to when the output voltage starts to ramp up) < 100 ms when VIN = 36 V to 75 V and IO = 0 A to 20 A; TSTART (start-up time when the output voltage increases from 0 V to 12 V) < 100 ms when VIN = 36 V to 75 V and IO = 0 A to 20 A.

Test result: Pass

Table 20. Turn-On Transient, TDSTART

Specification (ms)

Test Results (ms)

Item VIN (V) Load (A) -40°C +25°C +85°C -40°C +25°C +85°C
TDSTART 36 0 <100 13.4
TDSTART36 20 <100 13.4
TDSTART 48 0 <100 12.5
TDSTART48 20 <100 12.9
TDSTART 60 0 <100 13.1
TDSTART 60 20 <100 12.8
TDSTART75 0 <100 12.8
TDSTART 75 20 <100 12.5


TDSTART; Channel 1 (Blue): VO, Channel 2 (Cyan): VIN, Channel 4 (Green): IO


Table 21. Turn-On Transient, TSTART

Specification (ms)

Test Results (ms)

Item VIN (V) Load (A) -40°C +25°C +85°C -40°C +25°C +85°C
TSTART 36 0 <100 13.1
TSTART36 20 <100 13.1
TSTART 48 0 <100 12.5
TSTART48 20 <100 12.2
TSTART 60 0 <100 11.5
TSTART 60 20 <100 11.5
TSTART75 0 <100 11.1
TSTART 75 20 <100 11


TSTART Channel 1 (Blue): VO, Channel 2 (Cyan): VIN, Channel 4 (Green): IO

Prebias Start

Test Condition

The unit is shut down for a while by the on/off pin and restarts.

Pass/Fail Criteria

No output voltage drop under such start condition.

Test result: Pass

Channel 1 (Blue): VO, Channel 3 (Purple): On/Off

Turn-Off Transient

Test Condition

The unit was tested when the input voltage is removed.

Pass/Fail Criteria

Output voltage drops with monotonic slew rate and no negative current when VIN = 36 V to 75 V and IO = 0 A to 20 A.

Test result: Pass

Table 22. VO and IO at 36 V, 48 V, 60 V, and 75 V

Load (A) Specification at -40°C, +25°C, and +85°C Pass or Fail at 25°C
0 Monotonic drop and no negative current Pass
20 Monotonic drop and no negative current Pass


Channel 1 (Blue): VO, Channel 2 (Cyan): VIN, Channel 4 (Green): IO

Protection

See Table 5 for Protection specifications.

Input Undervoltage Lockout (UVLO)

Test Condition

Adjust the input voltage and turn on and turn off the unit.

Pass/Fail Criteria

Turns on the unit when VIN = 31 V to 35.5 V and IO = 0 A to 20 A. Turns off the unit when VIN = 30 V to 35 V and IO = 0 A to 20 A. Hysteresis between turn on and turn off should be higher than 1 V.

Test result: Pass

Table 23. Input UVLO

Specification (V) Test Results (V)
Item Load (A) −40°C +25°C +85°C −40°C +25°C +85°C
Turn-On Input Voltage 0 and 20 31 to 35.5 34
Turn-Off Input Voltage 0 30 to 35 31.9
Turn-Off Input Voltage 20 30 to 35 32
Hysteresis 0 >1 2.1
Hysteresis 20 >1 2

Note that for auxiliary power turn-on input voltage, auxiliary power turn-off input voltage, and hysteresis, all specifications are not specified and test results are to be determined.

Output Overvoltage Protection (Output OVP)

Test Condition

Set the VOUT_COMMAND to a value which exceeds the VOUT_OV_LIMIT.

Pass/Fail Criteria

The actual output voltage cannot exceed 15 V.

Test result: Pass

Table 24. OVP Setting Point with Enable Hiccup Mode (Y)

Specification (V) Test Results (V)
Item VIN (V) Load (A) −40°C +25°C +85°C −40°C +25°C +85°C
OVP with EHM (Y) 48 0 15 14.5
OVP with EHM (Y) 48 20 15 14.3

Channel 1 (Blue): VO, Channel 4 (Green): IO

Output Overcurrent Protection (Output OCP)

Test Condition

Apply a 23 A CC load at the output terminals.

Pass/Fail Criteria

The unit should be able to shut down the power conversion and restart after a certain time.

Test result: Pass

Channel 1 (Blue): VO, Channel 4 (Green): IO

Output Short-Circuit Protection (Output SCP)

Test Condition

A shorted load whose load current is up to 50 A is applied at the output terminals.

Pass/Fail Criteria

No device is damaged in this test. Testing at 36 V, 48 V, 60 V, and 75 V determined that IO and output can be shorting continuously (Y) with enable hiccup mode (Y) with no device damage specified at −40°C, +25°C, or +85°C; test results = pass for these voltage levels at 25°C.

Test result: Pass

Channel 1 (Blue): VO, Channel 4 (Green): IO

Monitoring

For full specifications listing, see Table 5.

Input Voltage Detected Precision

Test Condition

Measure VIN within full input voltage and load range.

Pass/Fail Criteria

EVIN (error of VIN) < ±2 V when VIN = 36 V to 75 V and IO = 0 A to 20 A.

Test result: Pass

Figure 101. Input Voltage Reading Error

Input Current Detected Precision

Test Condition

Measure IIN within full input voltage and load range.

Pass/Fail Criteria

EIIN (error of IIN) < ±0.5 A when VIN = 36 V to 75 V and IO = 5 A to 20 A.

Test result: Pass

Figure 102. Input Current Reading Error

Input Power Detected Precision

Test Condition

Measure PIN within full input voltage and load range.

Pass/Fail Criteria

EPIN (error of PIN) < ±12 W when VIN = 36 V to 75 V and IO = 5 A to 20 A.

Test result:

Figure 103. Input Power Reading Error

Output Voltage Detected Precision

Test Condition

Measure VO within full input voltage and load range.

Pass/Fail Criteria

EVO (error of VO) < ±0.2 V when VIN = 36 V to 75 V and IO = 0 A to 20 A.

Test result: Pass

Figure 104. Output Voltage Reading Error

Output Current Detected Precision

Test Condition

Measure IO within full input voltage and load range.

Pass/Fail Criteria

EIO (error of IO) < ±1 A when VIN = 36 V to 75 V and IO = 0 A to 20 A.

Test result: Pass

Figure 105. Output Current Reading Error

Output Power Detected Precision

Test Condition

Measure PO within full input voltage and load range.

Pass/Fail Criteria

EPO (error of PO) < ±6 W when VIN = 36 V to 75 V and IO = 0 A to 20 A.

Test result: Pass

Figure 106. Output Power Reading Error

Board Thermal

Figure 107. Board Thermal, Ambient Temperature = 25°C