TC28C46

TC18C46 TC28C46 TC38C46 CMOS CURRENT MODE PWM CONTROLLER FEATURES s s s s s s s s s s s s s s s s s s s Isolated Output Drive Low Power CMOS Construction Low Supply Current ................................. 2mA Typ. Wide Supply Voltage Operation .............. 8V to 18V Latch-Up Immunity ................... 500mA on Outputs Above and Below Rail Input Protection ............. 6V High Output Drive ................................ 500mA Peak Current Mode Control Fast Rise/Fall Time ..................... 50nsec @ 1000pF High Frequency Operation .......................... 500kHz UV Hysteresis Guaranteed Programmable Current Limit Shutdown Pin Available Double Ended Soft Start Low Prop Delay Current Amp to Output ......................................... < 350nsec Typ. Low Prop Delay Shutdown to Output ......................................... < 400nsec Typ. TC38C46Pin Compatible with Unitrode UC3846 ESD Protected ................................................. ±2 kV 1 GENERAL DESCRIPTION The TC38C46 is a current mode CMOS PWM control IC. It draws only 2 mA supply current, so it can be driven without a costly 50-60 Hz transformer. The output drive stage is capable of high drive currents, 300mA typical. The TC38C46 is pin compatible with earlier bipolar products so that designers can easily update older designs. A number of improvements have been added. This second generation part has been designed with an isolated drive stage. Unlike its cousin, the TC170, the output stage of t...