BD8158FVM Ver la hoja de datos (PDF) - ROHM Semiconductor
Número de pieza
componentes Descripción
Fabricante
BD8158FVM Datasheet PDF : 18 Pages
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BD8152FVM, BD8158FVM
Technical Note
(4) SEPIC type application
When it is intended to compose the step-up type DC/DC converter, the SEPIC type application is recommended. Since the
switching voltage is generated by the value of input voltage + output voltage, pay utmost attention to the withstand voltage
of SW pin.
L1 10uH
4.7uF
D1
RB161M-20
VCC
Vo
10uH
10uF
C1
10uF
C2
0.01uF
8
SS
SLOPE
+
SOFT
START
7
FCLK
OSC
6
VCC
5
SW
CURRENT
SENSE
Set LOGIC DRV
Reset
SDW N
P+W-M
OCP
E- R+R
UVLO/TSD
1.245V
VREF
COMP
1
FB
2
ENB
3
GND
4
R3
5.1kǡ
C3
3300pF
R1
110kǡ
R2
18kǡ
Fig. 33 SEPIC Application Circuit Diagram Example
(5) When the Supply Voltage is over 4.0 V (BD8158FVM only)
The Capacitor C4 is inserted to COMP pin, and it operates when the Supply Voltage is over 4.0 V.
In this case, Switching Frequency is limited to 600kHz.
D1
L1 10uH
RB161M-20
Vo
C1
10uF
C2
0.01uF
8
SS
SLOPE
+
SOFT
START
7
FCLK
OSC
6
VCC
5
SW
CURRENT
SENSE
Set LOGIC DRV
Reset
SDW N
P+W-M
OCP
E- R+R
UVLO/TSD
1.245V
VREF
COMP
1
FB
2
ENB
3
GND
4
10uF
C4
100pF
R3
5.1kǡ
C3
3300pF
R1
110kǡ
R2
18kǡ
Fig.34 Circuit Diagram Example(Supply Voltage over 4.0 V )
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13/17
2011.08 - Rev.C
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