User’s Guide
Switching Regulator Series
Step-Down DC/DC Converter
BD9E101FJ-LB Evaluation Board
BD9E101FJ-EVK-001
BD9E101FJ-EVK-001 Evaluation board delivers an output 5.0 volts from an input 7.2 to 36 volts using BD9E101FJ-LB, a synchronous rectification
step-down DC/DC converter integrated circuit, with output current rating of maximum 1A. The output voltage can be set by changing the external
parts of circuit and the loop-response characteristics also can be adjusted by the phase compensation circuit.
Performance specification
These are representative values, and it is not a guaranteed against the characteristics.
V
IN
= 24V, V
OUT
= 5.0V, Unless otherwise specified.
Parameter
Input Voltage Range
Output Voltage
Output Voltage Setting Range
Output Current Range
Loop Band Width
Phase Margin
Input Ripple Voltage
Output Ripple Voltage
Output Rising Time
Operating Frequency
Maximum Efficiency
V
IN
×0.0855
0
31.6
77.1
90
60
3
570
85.4
(NOTE2)
Min
7.0
(NOTE1)
Typ
Max
36
Units
V
V
Conditions
5.0
V
IN
×0.7
1
R1=12kΩ, R2=3kΩ
V
A
kHz
degrees
mVpp
mVpp
ms
kHz
%
I
O
= 0.85A
I
O
= 1A
I
O
= 1A
(NOTE1) When the output voltage is 5.0V, it is 7.2V by limiting ratio of the maximum duty.
(NOTE2) However, (V
IN
×0.0855) ≥ 1.0V
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No. 60UG012E Rev.003
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BD9E101FJ-EVK-001
Operation Procedures
1. Necessary equipments
(1) DC power-supply of 7.2V to 36V/1A
(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) Check Jumper pin of SW1 is short, between intermediate-terminal and OFF-side terminal.
User’s Guide
(4) Connect positive-terminal of power-supply to VIN+ terminal and negative-terminal to GND-terminal with a pair of wires.
(5) Connect load’s positive-terminal to VOUT+ terminal and negative-terminal to GND-terminal with a pair of wires.
(6) Connect positive-terminal of DC voltmeter 1 to TP1 and negative-terminal to TP2 for input-voltage measurement.
(7) Connect positive-terminal of DC voltmeter 2 to TP3 and negative-terminal to TP4 for output-voltage measurement.
(8) DC power-supply output is turned ON.
(9) IC is enable (EN) by shorting Jumper-pin of SW1 between intermediate-terminal and ON-side terminal.
(10) Check DC voltmeter 2 displays 5.0V.
(11) The load is enabled.
(12) Check at DC voltmeter 1 whether the voltage-drop (loss) is not caused by the wire’s resistance.
+
Load
-
+
DC Voltmeter 1
V
-
-
DC Power
+
V
DC Voltmeter 2
-
+
Figure 1. Connection Diagram
Enable-Pin
To minimize current consumption during standby-mode and normal operation, Enable-mode can be switched by controlling EN pin
(3pin) of the IC. Standby-mode is enabled by shorting Jumper-pin of SW1 between intermediate-terminal and OFF-side terminal
and normal-mode operation by shorting between intermediate-terminal and ON-side terminal.
It also can be switched between standby-mode and normal-mode operation by removing Jumper-pin and controlling the voltage
between EN and GND-terminal. Standby-mode is enabled when the voltage of EN is under 0.8V, and normal-mode operation
when it is over 2.5V.
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No. 60UG012E Rev.003
APR.2017
BD9E101FJ-EVK-001
Circuit Diagram
V
IN
= 7.2V to 36V, V
OUT
= 5.0V
R4
C7
User’s Guide
U1
BD9E101FJ-LB
TP1
J1
VIN
GND
TP2
SW1
ON
7 PGND
3 EN
C3 C2 C1
1 BOOT
2 VIN
TP5
TP3
L1
SW 8
COMP 6
C6
C4 C5
J2
VOUT
GND
TP4
R3
TP6
R1
FB 5
OFF
4 AGND
R2
C8
Figure 2. BD9E101FJ-EVK-001 Circuit Diagram
Bill of Materials
Count
2
1
0
1
0
1
1
1
1
1
1
1
1
1
2
1
Reference
Designator
C1, C7
C2
C3
C4
C5
C6
C8
L1
R1
R2
R3
R4
SW1
U1
J1, J2
-
Type
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Value
Description
Manufacturer
Part Number
GRM188B31H104MA92
GRM32EB31H106KA12
-
GRM31CB31A226KE19
-
GRM188B11H222KA01
GRM1882C1H101JA01
CLF7045T-4R7N
MCR03EZPFX1202
MCR03EZPFX3001
MCR03EZPFX2402
MCR03EZPJ000
PH-1x03SG
61300311121
BD9E101FJ-LB
TB111-2-2-U-1-1
OSTTC022162
MJ254-6BK
969102-0000-DA
Manufacturer
MURATA
MURATA
-
MURATA
-
MURATA
MURATA
TDK
ROHM
ROHM
ROHM
ROHM
USECONN
Wurth Electronics Inc.
Configuration
(mm)
1608
3225
3225
3216
3216
1608
1608
7269
1608
1608
1608
1608
-
-
SOP-J8
-
-
-
-
0.1µF 50V, B, ±20%
10µF
-
22µF
-
50V, B, ±10%
Not installed
10V, B, ±10%
Not installed
Ceramic Capacitor 2200pF 50V, B, ±10%
Ceramic Capacitor
Inductor
Resistor
Resistor
Resistor
Resistor
Pin header
IC
Terminal Block
Jumper
100pF 50V, CH, ±5%
4.7µH ±30%, DCR=26mΩmax, 4.1A
12kΩ
3kΩ
24kΩ
0Ω
-
-
-
-
1/10W, 50V, 1%
1/10W, 50V, 1%
1/10W, 50V, 1%
Jumper
2.54mm × 3 contacts
Buck DC/DC Converter
2 contacts, 15A, 14 to 22AWG
Jumper pin for SW1
ROHM
Alphaplus Connectors & Cables
On Shore Technology Inc
USECONN
3M
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No. 60UG012E Rev.003
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BD9E101FJ-EVK-001
Layout
PCB size: 50mm×50mm×1.6mm
User’s Guide
Figure 3. Top Silk Screen (Top view)
Figure 4. Top Silk Screen and Layout (Top view)
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No. 60UG012E Rev.003
APR.2017
BD9E101FJ-EVK-001
User’s Guide
Figure 5. Top Side Layout (Top view)
Figure 6. L2 Layout (Top view)
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No. 60UG012E Rev.003
APR.2017
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