TC170 datasheet(5/16 Pages) MICROCHIP

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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.

+ERROR AMP IN +Error Amp In. Non-inverting input for output voltage regulation.

-ERROR AMP IN

-Error Amp In. Inverting input of the amplifier for the reference voltage.

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.

SYNC

For PWM controller oscillator synchronization of two or more controllers. Or as a clock input to

sync oscillator from external signal.

OUTPUT A

A output drive of phase A from push pull transistors.

GND

Ground return for all input and output pins.

VDD

Supplies power to operate the output drivers only.

OUTPUT B

Output of phase B from push pull transistors.

VIN

Voltage bias supply for all TC170 circuits except the output transistors.

SHDN

Input pin to disable both output drives to 0V OFF.

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