UC3844b آیسی کنترلر PWM (کنترلر منبع تغذیه سویچینگ)

تخفیف ویژه

DESCRIPTION

The UC3842 is available in an 8-Pin mini-DIP the necessary features to implement off-line, fixed-frequency current-mode control schemes with a minimal external parts count. This technique results in improved line regulation, enhanced load response characteristics, and a simpler, easier to design control loop. Topological advantages include inherent pulse-by-pulse current limiting. Protection circuitry includes built-in undervoltage lock-out and current limiting. Other features include fully-latched operation, a 1% trimmed bandgap reference, and start-up current less than 1mA. These devices feature a totem-pole output designed to source and sink high peak current from a capacitive load, such as the gate of a power MOSFET. Consistent with N-channel power devices, the output is low in the OFF-state.

FEATURES

• Low start-up current (≤1mA)

• Automatic feed-forward compensation

• Pulse-by-pulse current limiting

• Enhanced load response characteristics

• Undervoltage lock-out with hysteresis

• Double pulse suppression

• High current totem-pole output

• Internally-trimmed bandgap reference

دانلود دیتاشیت :

http://www.alldatasheet.com/datasheet-pdf/pdf/19833/PHILIPS/UC3842.html