DESCRIPTION

The LX1562 is a second-generation family of power factor correction controllers using a discontinuous mode of operation. They are optimized for electronic ballast applications. Many improvements have been made over the original SG3561A controller introduced by Silicon General Semiconductor in 1992.

KEY FEATURES

■ INTERNAL START-UP CIRCUIT

■ INTERNAL CURRENT SENSE BLANKING

■ IMPROVED MICROPOWER START-UP

CURRENT (300µA max.)

■ CLAMPED E.A. OUTPUT FOR LOWER

TURN-ON OVERSHOOT

■ MULTIPLIER CLAMP LIMITS MAXIMUM

INPUT CURRENT

■ INTERNAL OVERVOLTAGE PROTECTION

REPLACES BUILT-IN C.S. OFFSET

■ PWM OUTPUT CLAMP LIMITS MOSFET

GATE DRIVE VOLTAGE

■ INCREASED UVLO HYSTERESIS REDUCES

START-UP TIMING (LX1562 only)

■ LOW OPERATING CURRENT CONSUMPTION

■ INTERNAL 1.5 REFERENCE

■ TOTEM POLE OUTPUT STAGE

■ AUTOMATIC CURRENT LIMITING OF BOOST

STAGE

■ DISCONTINUOUS MODE OF OPERATION

WITH NO CURRENT GAPS

■ NO SLOPE COMPENSATION REQUIRED

APPLICATIONS

■ ELECTRONIC BALLAST

■ SWITCHING POWER SUPPLIES