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It belongs to TOP Switch-GX Family from the manufacturer "Power Integrations". It is with Extended Power, Design Flexiblity, Eco Smart & Integrated Off-line Switcher. TOP Switch-GX uses the same proven topology as TOP Switch, 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 TOP Switch 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. Features:- Lower System Cost, High Design Flexibility Extended power range for higher power applications No heatsink required up to 34 W using P/G packages Features eliminate or reduce cost of external components Fully integrated soft-start for minimum stress/overshoot Externally programmable accurate current limit Wider duty cycle for more power, smaller input capacitor Separate line sense and current limit pins on Y/R/F packages Line under-voltage (UV) detection: no turn off glitches Line overvoltage (OV) shutdown extends line surge limit Line feed-forward with maximum duty cycle (DCMAX) reduction rejects line ripple and limits DCMAX at high line
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