Rohm BD7F100HFN-LB User manual

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© 2017 ROHM Co., Ltd.
No. 60AP001E Rev.001
2017.4
© 2017 ROHM Co., Ltd.
No. 60UG032E Rev.002
NOV.2018
User’s Guide
Switching Regulator Series
Isolated Flyback DC/DC Converter
BD7F100HFN-LB Evaluation Board
BD7F100HFN-EVK-002 (24V→5V, 1A)
BD7F100HFN-EVK-002 Evaluation board delivers an output 5 volts from an input 24 volts using BD7F100HFN-LB, Isolated Flyback DC/DC
converter integratedcircuit,with outputcurrent rating of maximum1A.
Performance specification
Thesearerepresentative values, and it is nota guaranteedagainstthe characteristics.
VIN = 24V,VOUT = 5V,Unless otherwisespecified.
Parameter
Min
Typ
Max
Units
Conditions
Input Voltage
24.0
V
Output Voltage
5.0
V
R4=3.9kΩ, R5=80.6kΩ
Output CurrentRange
13.8
1000
mA
Maximum OutputPower：5W
Operating Frequency
400
kHz
Maximum Efficiency
77.5
%
IO= 1000mA
Evaluation Board
PCB size: 70mm×50mm×1.6mm
Figure 1. BD7F100HFN-EVK-002 Evaluation Board Figure 2. BD7F100HFN-EVK-002 Evaluation Board
Top View Bottom View

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User’s Guide
BD7F100HFN-EVK-002
© 2017 ROHM Co., Ltd.
No. 60UG032E Rev.002
NOV.2018
Operation Procedures
1. Necessary equipments
(1) DC power-supply of 24V / 0.5A
(2) Maximum 1A load
(3) DC voltmeter
2. Connecting the equipments
(1) DC power-supply presets to 24V and then the power output turns off.
(2) The maximum load should be set at 1A and over it will be disabled.
(3) Connect positive-terminal of power-supply to VIN terminal and negative-terminal to GND terminal with a pair of wires.
(4) Connect load’s positive-terminal to VOUT+ terminal and negative-terminal to VOUT-terminal with a pair of wires.
(5) Connect positive-terminal of DC voltmeter 1 to VIN and negative-terminal to GND for input-voltage measurement.
(6) Connect positive-terminal of DC voltmeter 2 to VOUT+ and negative-terminal to VOUT- for output-voltage measurement.
(7) DC power-supply output is turned ON.
(8) Check DC voltmeter 2 displays 5V.
(9) The load is enabled.
Figure 3. Connection Diagram
DC Voltmeter 1
DC Voltmeter 2
-
+
-
+
-
DC Power
+
-
Load
+
V
V

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User’s Guide
BD7F100HFN-EVK-002
© 2017 ROHM Co., Ltd.
No. 60UG032E Rev.002
NOV.2018
Circuit Diagram
VIN = 24V, VOUT = 5V
Figure 4. BD7F100HFN-EVK-002 Circuit Diagram
Bill of Materials
C6
C5
R6
D3
C7 R7 D4
GND
R1
R2
VOUT-
VOUT+
SDX/EN
C8
CN1 +
-
-CN2
+
T1
4,5 1,2 6,7 9,10
U1
AGND
1
SDX/EN
2
COMP
3
REF
4
FIN
9
VIN 8
SW 7
PGND 6
FB 5
D1
D2
C3 C2C1
R4R3C4
R5
VIN
No. Value Description Size Part Number / Series Manufactuer
C1 1μF Capacitor, Chip, 50V, X7R 2012 GRM21BR71H105KA12L MURATA
C2 4.7μF Capacitor, Chip, 50V, X7R 3216 GRM31CR71H475KA12L MURATA
C3 - Notinstalled - - -
C4 - Notinstalled - - -
C5 1000pF Capacitor, Chip, 50V, CH 1608 GRM1882C1H102JA01 MURATA
C6 - Notinstalled - - -
C7 47μF Capacitor, Chip, 10V, X7R 3225 GRM32ER71A476KE15 MURATA
C8 - Notinstalled - - -
D1 RB160MM-40 Diode, Schottky 3516 RB160MM-40 ROHM
D2 TFZ20B Diode, Zener, Vz=18.63～19.59V 2514 TFZ20B ROHM
D3 RB160MM-40 Diode, Schottky 3516 RB160MM-40 ROHM
D4 - Notinstalled - - -
R1 1MΩResistor, Chip, 1/16W, 1% 1005 MCR01MZPF1004 ROHM
R2 120kΩResistor, Chip, 1/16W, 1% 1005 MCR01MZPF1203 ROHM
R3 - Short - - -
R4 3.9kΩResistor, Chip, 1/16W, 1% 1005 MCR01MZPF3901 ROHM
R5 80.6kΩResistor, Chip, 1/16W, 1% 1005 MCR01MZPF8062 ROHM
R6 1kΩResistor, Chip, 2/5W, 1% 2012 ESR10EZPF1001 ROHM
R7 330ΩResistor, Chip, 1/10W, 1% 1608 MCR03EZPFX3300 ROHM
T1 63μHTransformer, Np:Ns=3:1, ±20% 13.5 x 20.0 x 12.5mm CEP1311D-2405051R sumida
U1 BD7F100HFN I.C. BD7F100HFN HSON8 BD7F100HFN ROHM

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User’s Guide
BD7F100HFN-EVK-002
© 2017 ROHM Co., Ltd.
No. 60UG032E Rev.002
NOV.2018
Layout
Figure 5. Top Silk Screen and Layout Figure 6 . Bottom Silk Screen and Layout
(Top View) (Top View)
Figure 7. Top Side Layout Figure 8. Middle Layer1 Layout
(Top View) (Top View)
Figure 9. Middle Layer2 Layout Figure 10. Bottom Side Layer Layout
(Top View) (Top View)

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User’s Guide
BD7F100HFN-EVK-002
© 2017 ROHM Co., Ltd.
No. 60UG032E Rev.002
NOV.2018
Reference Application Data
VIN = 24V, VOUT = 5V
Figure 11. Efficiency vs Load Current
Figure 12. Load Regulation
0
10
20
30
40
50
60
70
80
90
0.0 0.2 0.4 0.6 0.8 1.0
Efficiency[%]
IOUT[A]
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
0.0 0.2 0.4 0.6 0.8 1.0
VOUT[V]
IOUT[A]