TOP258 - Power Integrations

TOP258 Integrated Off Line Switcher

TOPSwitch™-HX cost effectively incorporates a 700 V power MOSFET, high voltage switched current source, PWM control, oscillator, thermal shutdown circuit, fault protection and other control circuitry onto a monolithic device. Y Package Option for TOP259-261 In order to improve noise-immunity on large TOPSwitch-HX Y package parts, the F pin has been removed .

Features

down extends line surge limit
• Accurate programmable current limit
• Optimized line feed-forward for line ripple rejection
• 132 kHz frequency (254Y-258Y and all E/L packages) reduces transformer and power supply size
• Half frequency option for video applications
• Frequency jittering reduces EMI filter cost + AC DC IN OUT - D TOPSwitch-HX V CONTROL C S XF Figure 1. Typical Flyback Application. PI-4510-100206
• Heat sink is connected to SOURCE for low EMI
• Improved auto-restart delivers <3% of maximum power in short circuit and open loop fault conditions
• Accurate hysteretic t.