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SC1652CS

MICROPOWER INVERTING DC-DC CONVERTER

Semtech Corporation 

MICROPOWER INVERTING

DC-DC CONVERTER

SC1652

January 29, 1998

TYPICAL APPLICATION INFORMATION

The typical application circuit generates an adjustable negative voltage for

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

mized by using the appropriate inductor and switch. The following formulas

provide a guideline for determining the optimal component values:

( ) L = 11.1−0.15× V+ ×

V+

IOUT × VOUT

PNP : VCEO > V + + VOUT

IC(MAX )

≥ 200 ×

IOUT

V+

VCE(SAT )

<

0.4

V

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.

© 1997 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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