Description
TOPSwitch™-GX uses the same proven topology as
TOPSwitch, cost effectively integrating the high voltage
power MOSFET, PWM control, fault protection and other
control circuitry onto a single CMOS chip. Many new
functions are integrated to reduce system cost and improve
design flexibility, performance and energy efficiency.
Depending on package type, either 1 or 3 additional pins over
the TOPSwitch standard DRAIN, SOURCE and CONTROL
terminals allow the following functions: line sensing (OV/UV,
line feed-forward/DCMAX reduction), accurate externally set
current limit, remote ON/OFF, synchronization to an external
lower frequency, and frequency selection (132 kHz/ 66 kHz).
All package types provide the following transparent features:
Soft-start, 132 kHz switching frequency (automatically
reduced at light load), frequency jittering for lower EMI,
wider DCMAX, hysteretic thermal shutdown, and larger
creepage packages. In addition, all critical parameters (i.e.
current limit, frequency, PWM gain) have tighter temperature and absolute tolerances to simplify design and
optimize system cost