TOP249Y

Product Summary

The TOP249Y is a TOPSwitch -GX family extended power, design flexible, ecosmart, integrated off-line switcher. The TOP249Y 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, the TOP249Y has either 1 or 3 additional pins over the standard DRAIN, SOURCE and CONTROL terminals allowing the following functions: line sensing (OV/UV, line feedforward/DC max reduction), accurate externally set current limit, remote on/off, and synchronization to an external lower frequency and frequency selection (132 kHz/66 kHz).

Parametrics

TOP249Y absolute maximum ratings: (1)Drain voltage: -0.3 to 700 V; (2)Drain peak current: 8.64 A; (3)Control voltage: -0.3 to 9 V; (4)Control current: 100 mA; (5)Line sense pin voltage: -0.3 to 9 V; (6)Current limit pin voltage: -0.3 to 4.5 V; (7)Multi-function pin voltage: -0.3 to 9 V; (8)Frequency pin voltage: -0.3 to 9 V; (9)Storage temperature: -65 to 150 °C; (10)Operating junction temperature (2): -40 to 150 °C; (11)Lead temperature (3): 260 °C.

Features

TOP249Y features: (1)Extended power range to 290 W; (2)Features eliminate or reduce cost of external components; (3)Fully integrated soft-start for minimum stress/overshoot; (4)Externally programmable accurate current limit; (5)Wider duty cycle for more power, smaller input capacitor; (6)Separate line sense and current limit pins on Y/R/F packages; (7)Line under-voltage (UV)detection: no turn off glitches; (8)Line overvoltage (OV)shutdown extends line surge limit; (9)Line feed forward with maximum duty cycle (DCMAX)reduction rejects line ripple and limits DCMAX at high line; (10)Frequency jittering reduces EMI and EMI filtering costs; (11)Regulates to zero load without dummy loading; (12)132 kHz frequency reduces transformer/power supply size; (13)Half frequency option in Y/R/F packages for video applications; (14)Hysteretic thermal shutdown for automatic fault recovery; (15)Large thermal hysteresis prevents PC board overheat.

Diagrams