MIC38C43 datasheet(8/24 Pages) MICROCHIP

8 / 24 page

MIC38C42/43/44/45

DS20006436B-page 8



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3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

Pin Number

8-Pin DIP,

SOIC, MSOP

Pin Number

14-Pin DIP

and SOIC

Pin Name

Description

COMP

Compensation: Connect external compensation network to modify

the error amplifier output.

—

Not internally connected.

Feedback (Input): Error amplifier input. Feedback is 2.5V at

desired output voltage.

—

Not internally connected.

ISNS

Current Sense (Input): Current sense comparator input. Connect

to current sensing resistor or current transformer.

—

Not internally connected.

RT/CT

Timing Resistor/Timing Capacitor: Connect external RC network to

select switching frequency.

—

GND

Ground: Combined analog and power ground.

—

PGND

Power Ground: N-channel driver transistor ground.

—

AGND

Analog Ground: Controller circuitry ground.

OUT

Gate Driver Output: Totem-pole output.

—

Power Supply (Input): P-channel driver transistor supply input.

Return to power ground (PGND).

VDD

Analog Supply (Input): Controller circuitry supply input. Return to

analog ground (AGND).

—

Not internally connected.

VREF

5V Reference (Output): Connect external RC network.

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