BL8080
HIGH INTEGRATED PWM CONTROLLER
GENERAL DISCRIPTION
The BL8080 is a PWM controller designed to
drive high voltage NPN transistors. It integrates
an oscillator, cycle-by-cycle current limit,
thermal protection and over voltage protection,
great reducing the number of external
components and system level cost.
Compared to conventional controller, BL8080
has a significantly smaller startup current of
less than 20uA, which allows large startup
resistor that enabes further power saving. The
frequency can be adjusted from an external
capcitor. At light load condition the frequency of
BL8080 can be varied according to the load,
which improves the light load efficiency.
FEATURES
Low start up current
Easy programmable frequency
Compact SOT23-6 package
Universal voltage range: 85VAC -264VAC
Thermal shutdown
Cycle by cycle current limit
Slope current drive
Low standby power consumption
APPLICATIONS
Cell phone charger
DVD player power supply
MP3 charger
LED lighting driver
TYPICAL APPLICATION CIRCUIT
AC Input
DC Output
6 CT
5 GND
4 FB
OB 1
OE 2
VCC 3
LC8100
BL8080
Figure1: BL8080 Typical Application Circuit
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