SC1650 データシートの表示（PDF） - Semtech Corporation
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SC1650 Datasheet PDF : 4 Pages
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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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