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Linear ANALOG DEVICES DC2631A Demo Manual
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Linear ANALOG DEVICES DC2631A Demo Manual

Linear ANALOG DEVICES DC2631A Demo Manual

For ltc7852 high efficiency 6-phase step-down converter
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High Efficiency 6-Phase Step-Down Converter
DESCRIPTION
Demonstration circuit 2631A features the
high output current, high efficiency step down converters
each with its own assembly type. The converter for the -A
assembly provides two 3-phase outputs of 1.0V/100A and
1.5V/100A. The -B assembly provides a single 6-phase
1.0V/200A output. Block diagrams are shown in Figure 3.
Both converters operate over a 7V to 14V input voltage
range at a switching frequency of 400kHz.
The power stage for each phase consists of a 5mm ×
5mm DrMOS and 11.3mm × 11.0mm 0.25µH ferrite
inductor with a DCR of 0.32mΩ typical. The LTC7852
employs a peak current mode architecture which allows
accurate DCR sensing and sharing with sub-mOhm DCR
inductors. The LTC7852 provides a three-state compatible
PWM output for each DrMOS.
Additional features of the DC2631A include:
Differential sensing for the output voltages of V
l
and V
OUT2
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
V
OUT1
I
OUT1
V
Typical Efficiency (See Figure 4)
OUT1
V
OUT2
I
OUT2
V
Typical Efficiency (See Figure 5)
OUT2
Nominal Switching Frequency
IMON pins to monitor the inductor current of each rail.
LTC
7852
in two
®
l
Optional resistors and jumpers to change the phase
l
arrangement for V
Optional resistors and jumpers to parallel V
l
and V
RUN, PGOOD, PLLIN and CLKOUT pins
l
The LTC7852 data sheet provides a complete descrip-
tion of the IC operation and application information. The
data sheet must be read in conjunction with the quick
start guide.
Design files for this circuit board are
OUT1
All registered trademarks and trademarks are the property of their respective owners.
Specifications are at T
CONDITIONS
V
= 7V to 14V, I
= 0A to 100A
IN
OUT1
V
= 7V to 14V, V
= 1.0V
IN
OUT1
V
= 12V, I
= 100A
IN
OUT1
V
= 7V to 14V, I
= 0A to 100A
IN
OUT2
V
= 7V to 14V, V
= 1.5V
IN
OUT2
V
= 12V, I
= 100A
IN
OUT2
DEMO MANUAL
DC2631A-A/DC2631A-B
and V
OUT1
V
: 4ph, V
: 2ph
OUT1
OUT2
q
V
: 5ph, V
: 1ph
OUT1
OUT2
q
Note, the default arrangement is:
q
V
: 3ph, V
: 3ph
OUT1
OUT2
.
OUT2
= 25°C, for the -A Assembly
A
VALUE
7V to 14V
1.0V ± 1.5%
100A
90.3% Typical
1.5V ± 2%
100A
93.3% Typical
400kHz
LTC7852
:
OUT2
OUT1
available.
Rev. 0
1

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Summary of Contents for Linear ANALOG DEVICES DC2631A

  • Page 1 DEMO MANUAL DC2631A-A/DC2631A-B LTC7852 High Efficiency 6-Phase Step-Down Converter DESCRIPTION IMON pins to monitor the inductor current of each rail. Demonstration circuit 2631A features the 7852 in two ® high output current, high efficiency step down converters Optional resistors and jumpers to change the phase each with its own assembly type.

  • Page 2: Performance Summary

    DEMO MANUAL DC2631A-A/DC2631A-B PERFORMANCE SUMMARY Specifications are at T = 25°C, for the -B Assembly PARAMETER CONDITIONS VALUE Input Voltage Range 7V to 14V = 7V to 14V, I = 0A to 200A 1.0V ± 1.5% OUT1 OUT1 = 7V to 14V, V = 1.0V 200A OUT1...
  • Page 3 DEMO MANUAL DC2631A-A/DC2631A-B QUICK START PROCEDURE OUT2 LOAD #2 – OUT2 – SUPPLY – OUT1 – LOAD #1 OUT1 DC2631A-A FO1a NOTE: FOR ACCURATE EFFICIENCY MEASUREMENTS, MONITOR V ACROSS THE CERAMIC AT C OUT1 OUT1 ± AND V ACROSS THE CERAMIC AT C .
  • Page 4 DEMO MANUAL DC2631A-A/DC2631A-B QUICK START PROCEDURE PULSE GENERATOR DC2631A-A F02 TO OSCILLOSCOPE Figure 2. Setup of the Dynamic Load Circuits PHASE 1 PHASE 1 0° 0° PHASE 2 PHASE 2 OUT1 120° 120° 1.0V/100A PHASE 3 PHASE 3 240° 240° OUT1 7V to 14V 7V to 14V 1.0V/200A...
  • Page 5 DEMO MANUAL DC2631A-A/DC2631A-B QUICK START PROCEDURE 100% COMPONENTS/CONDITIONS: • DrMOS = FDMF5820DC • f = 400KHZ • L = WURTH 744301025 (0.25µH, 0.32MΩ) • OTHER RAIL DISABLED • EXTERNAL 5V BIAS APPLIED (EFFICIENCY INCLUDES BIAS POWER) = 7V = 10V •...
  • Page 6 DEMO MANUAL DC2631A-A/DC2631A-B QUICK START PROCEDURE Inductors DrMOS CinBulk #1 CinBulk #2 Airflow Figure 7. Thermal Image of the 1.0V/100A 3-Phase and 1.5V/100A 3-Phase Converter (DC2631A-A) at V = 12V, Full Load on Both Outputs. Tambient = 24°C with 200 LFM Airflow. Hot Spot is DrMOS of Phase 4. DrMOS = FDMF5820DC, L = Wurth 744301025, f = 400kHz.
  • Page 7 DEMO MANUAL DC2631A-A/DC2631A-B QUICK START PROCEDURE OUT1(AC) 50mV/DIV 100A LOAD STEP 50A/DIV DC2631A-A F09 50µsec/DIV Figure 9. 50% to 100% Load Step Response of the 1.0V/100A 3-Phase Rail of the DC2631A A. V = 12V. = 9x (330µF, 9mΩ) || 3x (220µF, X5R, 1210), f = 400kHz OUT2(AC) 50mV/DIV...

  • Page 8: Parts List

    DEMO MANUAL DC2631A-A/DC2631A-B PARTS LIST DEMO CIRCUIT 2631A-A ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Component DC2631A-A C1, C2, C5, C6, C18, C19, C24, C25, CAP ., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867 C28, C29, C32, C33, C36, C37 KEMET, C0603C225K4PACTU C3, C4, C8, C9, C10, C11, C12, C13, CAP ., 0.22µF, X5R, 25V, 10%, 0603...
  • Page 9 DEMO MANUAL DC2631A-A/DC2631A-B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R37, R50, R64, R76 RES., 10 Ω, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA NIC, NRC06F10R0TRF PANASONIC, ERJ3EKF10R0V Rohm, MCR03EZPFX10R0 YAGEO, RC0603FR-0710RL R4, R6, R28, R30, R42, R47, R48 RES., AEC-Q200, 1Ω, 5%, 1/10W, 0603 VISHAY, CRCW06031R00JNEA RES., 37.4kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060337K4FKEA...
  • Page 10 PANASONIC, ERJ3EKF1004V R128 RES., AEC-Q200, 162kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603162KFKEA PANASONIC, ERJ3EKF1623V ROHM, MCR03EZPFX1623 IC, LDO uPWR LINEAR REG., MSOP-8 ANALOG DEVICES, LT3010EMS8E#PBF ANALOG DEVICES, LT3010EMS8E#TRPBF Additional Components C26, C27, C38, C39, C52, C53, C54, CAP ., OPTION, 0603...
  • Page 11 DEMO MANUAL DC2631A-A/DC2631A-B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R13, R15, R35, R36, R43, R45, R53, RES., OPTION, 0603 R56, R57, R58, R59, R60, R61, R62, R63, R65, R70, R71, R77, R80, R81, R82, R83, R106, R107, R108, R109, R111, R112, R114, R115, R117, R118, R120, R121, R123, R124...
  • Page 12 DEMO MANUAL DC2631A-A/DC2631A-B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Component DC2631A-B C1, C2, C5, C6, C18, C19, C24, C25, CAP ., 2.2µF, X5R, 16V, 10%, 0603 KEMET, C0603C225K4PAC7867 C28, C29, C32, C33, C36, C37 KEMET, C0603C225K4PACTU C3, C4, C8, C9, C10, C11, C12, C13, CAP ., 0.22µF, X5R, 25V, 10%, 0603 AVX, 06033D224KAT2A...
  • Page 13 DEMO MANUAL DC2631A-A/DC2631A-B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R37, R50, R64, R76 RES., 10Ω, 1%, 1/10W, 0603 VISHAY PANASONIC Rohm YAGEO R4, R6, R28, R30, R42, R47, R48 RES., AEC-Q200, 1Ω, 5%, 1/10W, 0603 VISHAY, CRCW06031R00JNEA RES., 37.4kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060337K4FKEA R72, R73 RES., AEC-Q200, 39.2kΩ, 1%, 1/10W, 0603...
  • Page 14 NIC, NRC06F1004TRF R128 RES., AEC-Q200, 162kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603162KFKEA PANASONIC, ERJ3EKF1623V ROHM, MCR03EZPFX1623 IC, LDO uPWR LINEAR REG., MSOP-8 ANALOG DEVICES, LT3010EMS8E#PBF ANALOG DEVICES, LT3010EMS8E#TRPBF Additional Components C26, C27, C38, C39, C52, C53, C54, CAP ., OPTION, 0603...
  • Page 15 DEMO MANUAL DC2631A-A/DC2631A-B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R13, R15, R35, R36, R43, R45, R53, RES., OPTION, 0603 R56, R57, R58, R59, R60, R61, R62, R63, R65, R70, R71, R106, R107, R108, R109, R111, R112, R114, R115, R117, R118, R120, R121, R123, R124, RB2, RT2, RITH2 Hardware...

  • Page 16: Schematic Diagram

    DEMO MANUAL DC2631A-A/DC2631A-B SCHEMATIC DIAGRAM Rev. 0...
  • Page 17 DEMO MANUAL DC2631A-A/DC2631A-B SCHEMATIC DIAGRAM Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice.
  • Page 18 DEMO MANUAL DC2631A-A/DC2631A-B ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern.

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