RH5RH
• Step-up/Step-down Circuit with Flyback
Diode
VOUT
Trance1:1
RH5RH××1A
OUT
Lx
VIN
+
Vss
Capacitor
Starter Circuit
(Note) Use a RH5RH××2B,depend on the Output Current.
FIG. 8
The Starter Circuit is necessary for all above circuits.
*
1.for Step-up Circuit.
VOUT side
VIN side
Starter Circuit
2.for Step-down and Step-up/Step-down Circuit.
VIN side
VOUT side
Tr
RST
Starter Circuit
ZDST
ZDst 2.5V≤/ZDst≤Designation of Output Voltage
Rst Input Bias Current of ZDst and Tr.
(several kΩ to several hundreds kΩ)
27