TC28C43

TC18C43 TC28C43 TC38C43 BiCMOS CURRENT MODE PWM CONTROLLERS FEATURES s s s s s s s s s s s s s s Low Power BiCMOS Design Tough CMOSTM Construction Low Supply Current ............. 1.0mA Typ @ 100kHz Wide Supply Voltage Operation .............. 8V to 15V Latch-Up Immunity ................... 500mA on Outputs Input Will Withstand Negative Inputs to – 5 Volts High Output Drive .................................... 0.7A Peak (1.2A on 14-Pin and 16-Pin Versions) 2 kV ESD Protection Current Mode Control Fast Rise/Fall Time (Max) ........... 60nsec @ 1000pF High Frequency Operation ..........................500kHz Clock Ramp Reset Current ................. 2.5mA ±10% Low Propagation Delay Current Amp to Output ............................................ 140nsec Typ. Pin Compatible with UC3843 1 GENERAL DESCRIPTION The TC38C43 is a current mode BiCMOS PWM control IC. With a low 1.0 mA supply current along with high drive current (0.7A peak) it provides a low cost solution for a PWM that operates to 500 kHz and directly drives MOSFETs up to HEX 3 size. Performance of the oscillator and current sense amplifier have been greatly improved over previous bipolar versions. Voltage and temperature stability have been improved by a factor of 3. Noise immunity (PSRR) has also been improved. The TC38C43 is pin compatible with the earlier bipolar version so that designers can easily update older designs. Improvements have been added, though. For example, clock ramp reset current is specified a...