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TC170 Datasheet(PDF) 5 Page - Microchip Technology |
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TC170 Datasheet(HTML) 5 Page - Microchip Technology |
5 / 16 page © 2002 Microchip Technology Inc. DS21395B-page 5 TC170 2.0 PIN DESCRIPTIONS Thedescriptionsof the pins arelistedinTable2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (16-Pin PDIP, SOIC) Symbol Description 1SOFT START/ILIM Soft Start Adjust/Current Limit. For setting the peak current threshold of sense inputs (pins 3 and 4). Second function of this pin is Soft-Start Adjust. 2VREFOUT Reference supply output of 5.1 volts. It can supply a minimum of 10mA. 3-ISENSEIN -Current Sense Input. Inverting input for sensing peak current of the pass transistor through series sense current monitor resistor. 4+ISENSEIN +Current Sense Input. Non-inverting input used in conjunction with pin 3. This senses the positive end of current monitor resistor. 5 +ERROR AMP IN +Error Amp In. Non-inverting input for output voltage regulation. 6 -ERROR AMP IN -Error Amp In. Inverting input of the amplifier for the reference voltage. 7 CMPTR For compensation of the feedback loop response. 8CO Timing capacitor (CO) input to set oscillator frequency in conjunction with pin 9, RO,resistor input. Second function is for setting crossover dead time of pin 11and 14 outputs. 9RO Timing resistor (RO) input to set oscillator frequency by setting constant current charge rate to charge capacitor CO. 10 SYNC For PWM controller oscillator synchronization of two or more controllers. Or as a clock input to sync oscillator from external signal. 11 OUTPUT A A output drive of phase A from push pull transistors. 12 GND Ground return for all input and output pins. 13 VDD Supplies power to operate the output drivers only. 14 OUTPUT B Output of phase B from push pull transistors. 15 VIN Voltage bias supply for all TC170 circuits except the output transistors. 16 SHDN Input pin to disable both output drives to 0V OFF. |
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