RH5RH

APPLICATION CIRCUITS

• 12V Step-up Circuit

Inductor

Diode

VOUT

 

RH5RH502B

ZD:6.8V

 

 

Cb

OUT

+

VIN

EXT

Capacitor

 

 

 

Vss

RZD

 

 

Rb

 

 

Tr

 

 

Starter Circuit

(Note) When the Output Current is small or the Output Voltage is unstable,use the Rzd for flowing the bias current through the Zener diode ZD.

FIG. 6

Step-down Circuit

 

 

Inductor

 

PNP Tr

 

 

VOUT

Rb2

Diode

 

 

 

RH5RH××1A

 

VIN

Lx

OUT

 

Rb1

 

 

 

 

 

 

 

Vss

+

 

 

Capacitor

 

 

 

Starter Circuit

(Note) When the LX pin Voltage is over the rating at the time PNP Tr is OFF,use a RH5RH⋅⋅2B and drive the PNP Tr. by the external NPN Tr.

FIG. 7

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