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SC1650

HIGH-VOLTAGE INVERTING DC-DC CONVERTER

Semtech Corporation 

HIGH-VOLTAGE INVERTING

DC-DC CONVERTER

January 29, 1998

TYPICAL APPLICATION INFORMATION

SC1650

© 1997 SEMTECH CORP.

The typical application circuit generates an adjustable negative voltage

for contrast bias of LCD displays. Efficiency and output power can be

optimized by using the appropriate inductor and switch. The following

formulas provide a guideline for determing the optimal component val-

( ) L = 11.1− 0.15 × V + ×

V+

IOUT × VOUT

PNP : VCEO > V + + VOUT

IC (MAX )

≥ 200 ×

IOUT

V+

VCE ( SAT )

<

0.4V

at

IC

= 200

×

IOUT

V+

and β = 10

( ) RB ≅ 3 × L × V + − 0.8 , where units : V + in Volt, VOUT in Volt ,

IOUT in Ampere , L in µH,

RB in Ohm.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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