RV5VH Datasheet, PDF (43/47 Pages) RICOH electronics devices division – DC/DC CONVERTER CONTROLLER

RV5VH3××
TYPICAL APPLICATION 2
Output DC/DC 1
R5
C5
R6
L1
SBD
R4
NPN Tr.
C1
C4
CSW
FB1
VDD
EXT1
VIN
DOUT
FB2
EXT2
GND
R3
R1
PMOS
L2
R2
C3
SBD
Output DC/DC 2
C2
CoiI
Diode
capacitor
PMOS
NPN Tr.
Resistor
L1 : 100µH, L2 : 100µH
Schottky type
C1 : 22µF(Ta), C2 : 22µF(Ta)
C3 : 0.01µF (ceramic)
C4 : 0.01µF (ceramic)
C5 : 0.01µF (ceramic)
2SJ238 (TOSHIBA)
2SD1628G (SANYO)
R1 : 100kΩ , R2 : 0 to 500kΩ
R3 : 100kΩ
R4 : 300Ω
R5 : 0 to 500kΩ, R6 : 50kΩ
Description
• Step up DC/DC converter : DC/DC1
The oscillator can operate when CSW is “H”. When the CSW is “L” the EXT1 outputs GND.
The output voltage can be adjusted by R5 and R6 with FB1 of two volt.
• Invering DC/DC converter : DC/DC2
The oscillator can operate when CSW is “H”. When the CSW is “L” the EXT2 outputs VDD.
The output voltage can be adjusted by R1 and R2 with FB2 of zero volt.
• VoItage Detector
VDD pin can be monitored. This could be always operated with VDD.
The DOUT pin outputs “L” when low voltage is detected with Nch open-drain output.
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