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Rohm BD9E304FP4-EVK-002 User Manual

Buck converter with integrated fet
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Switching Regulator Series
Buck Converter with Integrated FET
BD9E304FP4-LBZ EVK
BD9E304FP4-EVK-002 (24V→12V, 3.0A)
Introduction
This user's guide provides the necessary steps to operate the EVK of ROHM's BD9E304FP4-LBZ 1-channel Buck DC/DC
converter. This includes the external parts, operating procedures, and application data.
Description
This EVK has been developed for ROHM's synchronous buck DC/DC converter customers evaluating BD9E304FP4-LBZ
and outputs 12V from 24V input voltage. The BD9E304FP4-LBZ accepts a power supply input range of 4.5V to 36V and
generates an output voltage ranging from (0.1 x V
fixed at 300 kHz. The Light Load Mode control provides good efficiency characteristics in light load conditions, which is
ideal for applications that needs to lessen the standby power. The current mode control DC/DC converter provides high-
speed transient response performance. Additional protection functions include a built-in soft start function to prevent inrush
current at startup, UVLO (Under Voltage Lock Out), TSD (Thermal Shutdown Detection), SCP (Short Current Protection),
OCP (Over Current Protection), and OVP (Over Voltage Protection).
Application
Industrial Products as Factory Automation
Secondary power supply and adapter equipment
Telecommunication Devices
Operating Limits
Parameter
Input Voltage
Output Voltage
Output Current Range
Operating Frequency
Maximum Efficiency
UVLO Detect Voltage
UVLO Hysteresis Width
© 2022 ROHM Co., Ltd.
or 0.7V) to 0.8 x V
IN
Min
Typ
Max
18.0
24.0
36.0
12.0
3.0
300
96.5
3.9
350
1/9
User's Guide
using external resistors. The operating frequency is
IN
Units
V
V
A
kHz
%
Vin=24V, Iout=0.6A
V
Vin sweep down
mV
Conditions
No. 64UG041E Rev.001
2022.2

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Summary of Contents for Rohm BD9E304FP4-EVK-002

  • Page 1 BD9E304FP4-LBZ EVK BD9E304FP4-EVK-002 (24V→12V, 3.0A) Introduction This user’s guide provides the necessary steps to operate the EVK of ROHM’s BD9E304FP4-LBZ 1-channel Buck DC/DC converter. This includes the external parts, operating procedures, and application data. Description This EVK has been developed for ROHM’s synchronous buck DC/DC converter customers evaluating BD9E304FP4-LBZ and outputs 12V from 24V input voltage.

  • Page 2: Operating Procedure

    Figure 1. BD9E304FP4-EVK-002(Top View) EVK Schematic -LBZ Figure 2. BD9E304FP4-EVK-002 Circuit Diagram Operating Procedure Turn off the DC power supply and connect the GND terminal of the power supply to the GND_F terminal (left side in EVK) of the EVK.
  • Page 3 Short Soldering Shorted by Solder Open Short Soldering Shorted by Solder VIN_S,VIN_F, GND_Fx2, GND_Sx2, Test Pin 1mm Hole ST-2-2 Mac8 VOUT_S, VOUT_F SW_EN Header 68000-103HLF Amphenol FCi SW_EN Jumper QPC02SXGN-RC SULLINS © 2022 ROHM Co., Ltd. No. 64UG041E Rev.001 2022.2...

  • Page 4: Board Layout

    Material Board Size Copper Thickness FR-4 67.5mm x 67.5mm x 1.6mmt 1oz (35μm) The layout of BD9E304FP4-EVK-002 is shown below. Figure 3. Top Layer Layout Figure 4. Middle1 Layer Layout (Top View) (Top View) Figure 5. Middle2 Layer Layout Figure 6. Bottom Layer Layout...
  • Page 5 Figure 8. Switching Frequency vs Input Voltage （V =12V, I =3A) =24V, V =12V, I =0A） VIN=18V VIN=24V VIN=36V 1000 10000 Output Current: I [mA] Figure 9. Efficiency vs Output Current (V =12V) © 2022 ROHM Co., Ltd. No. 64UG041E Rev.001 2022.2...
  • Page 6 VIN (20Vdiv) VIN (20V/div) EN (20V/div) EN (20V/div) VOUT (10V/div) VOUT (10V/div) SW (20V/div) SW (20V/div) 2ms/div 2ms/div Figure 12. Rise-up Waveform Figure 13. Shut-down Waveform =0V→24V, I =3A) =24V→0V, I =3A) © 2022 ROHM Co., Ltd. No. 64UG041E Rev.001 2022.2...
  • Page 7 10µs/div Figure 14. SW Waveform Figure 15. SW Waveform （V =24V, V =12V, I =3A) =24V, V =12V, I =30ｍA） =5 V/div Figure 16. Frequency Response =24V, V =12V, I =3A) © 2022 ROHM Co., Ltd. No. 64UG041E Rev.001 2022.2...
  • Page 8 24V of DC bias voltage. (The data shown in Figure 17 is for reference only. Please check with the capacitor manufacturer for the DC bias characteristics of ceramic capacitors.) DC bias characteristics P/N:GRM23EC72A106KE05 C-DC bias capchange,25degC,AC1mVrms DC Bias:24.0V Cap.Change Rate:-45.5% Figure 17. GRM32EC72A106KE05 (Murata) DC bias characteristics © 2022 ROHM Co., Ltd. No. 64UG041E Rev.001 2022.2...

  • Page 9: Revision History

    BD9E304FP4-EVK-002 User’s Guide Revision History Revision Date Description Number 14.Feb.2022 Initial release © 2022 ROHM Co., Ltd. No. 64UG041E Rev.001 2022.2...
  • Page 10 Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM or any other parties. ROHM shall have no responsibility whatsoever for any dispute arising out of the use of such technical information.

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