R1280D002X Datasheet, PDF (24/26 Pages) RICOH electronics devices division – 2CH PWM DC/DC Controller

External Components
Inductor L1,2: 6.8µH, LDR655312T(TDK)
Diode: FS1J3 (Origin Electronics)
NMOS: IR7601 (International Rectifier)
PMOS: Si3443 (Siliconix)
Resistors: R1, R2, R3, R4 for Setting Output Voltage. Recommendation values are R1+R2≤100kΩ or R3+R4≤100kΩ
R5=43kΩ, R6=10kΩ
Capacitors: Ceramic Capacitor
(Example)
C1=C2=10µF, C3=4.7µF, C4=0.33µF, C5=0.33µF, C6=120pF, C7=50pF, C8=1µF
Note: Maximum voltage tolerance of each component should be considered. With the transistor shown above is
appropriate to set up to ±15V as output voltage.
s APPLICATION EXAMPLE
q R1280D002A/C
C10
VOUT1
VOUT3
C11
L1
C1
R1
R2
C3
C6 ^NMOS
C9
R7
R5
C4 _R8
R11
EXT1^EXT2
GND _VIN
AMPOUT1
Vrefout
DTC1 DTC2
C5
V_FB1 V_FB2
R9
R10
C7
R6
PMOS
C8
L2
R3
Diode
R4
VOUT2
C2
External Components
Inductor L1,2: 6.8µH, LDR655312T(TDK) for A version, 22µH for R1280D002C
Diode: FS1J3 (Origin Electronics)
NMOS: IR7601 (International Rectifier)
PMOS: Si3443 (Siliconix)
Resistors: R1, R2, R3, R4 for Setting Output Voltage. Recommendation values are R1+R2≤100kΩ or R3+R4≤100kΩ
R5=43kΩ, R6=10kΩ, R7=R9=22kΩ, R8=R10=43kΩ, R11=220kΩ
Capacitors: Ceramic Capacitor
(Example)
R1280D002A: C1=C2=10µF, C3=4.7µF, C4=0.22µF, 5=0.47µF,C6=120pF,C7=50pF,C8=C10=C11=1µF,C9=1000pF
R1280D002C:C1=C2=10µF,C3=4.7µF, C4=0.22µF,C5=0.47µF,C6=220pF,C7=330pF,C8=C10=C11=1µF,C9=1000pF
This IC can be used 3 Output TFT Bias Circuit as shown above. VOUT3=2×VOUT1-Vf
Note: Maximum voltage tolerance of each component should be considered. With the transistor shown above is
appropriate to set up to +15V as VOUT1, -15V as VOUT2, 30V as VOUT3.
Rev.1.10
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