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MC44602P2

HIGH PERFORMANCE CURRENT MODE CONTROLLER

ON Semiconductor 

Pin

1

2

3

4, 5, 12, 13

6

7

8

9

10

11

14

15

16

MC44602

PIN FUNCTION DESCRIPTION

Function

Description

Compensation

This pin is the Error Amplifier output and is made available for loop compensation.

Load Detect Input

A voltage indicating a severe overload or short circuit condition at any output of the

switching power supply is connected to this input. The Oscillator is controlled by this

information making the power supply short circuit proof.

Voltage Feedback Input

This is the inverting input of the Error Amplifier and the noninverting input of the

Foldback Amplifier. It is normally connected to the switching power supply output

through a resistor divider.

Sink Ground

The Sink Ground pins form a single power return that is typically connected back to the

power source on a separate path from Pin 9 Ground, to reduce the effects of switching

transient noise on the control circuitry. These pins can be used to enhance the package

power capabilities (Figure 14). The Sink Output low state (VOL) can be modified by

applying a negative voltage to these pins with respect to Ground (Pin 9) to optimize

turn–off of a bipolar junction transistor.

Current Sense Input

A voltage proportional to inductor current is connected to this input. The PWM uses this

information to terminate conduction of the output switch transistor.

Sync Input

A narrow rectangular waveform applied to this input will synchronize the Oscillator. A dc

voltage within the range of 3.2 V to 5.5 V will inhibit the Oscillator.

RT/CT

Ground

The Oscillator frequency and maximum Output duty cycle are programmed at this pin by

connecting resistor RT to Vref and capacitor CT to ground.

This pin is the control circuitry ground and is typically connected back to the power

source on a separate path from the Sink Ground (Pins 4, 5, 12, 13).

Sink Output

Peak currents up to 1.5 A are sunk by this output suiting it ideally for turning–off a bipolar

junction transistor. The output switches at one–half the oscillator frequency.

Source Output

Peak currents up to 1.0 A are sourced by this output suiting it ideally for turning–on a

bipolar junction transistor. The output switches at one–half the oscillator frequency.

VC

The Output high state (VOH) is set by the voltage applied to this pin. With a separate

connection to the power source, it can reduce the effects of switching transient noise on

the control circuitry.

VCC

This pin is the positive supply of the control IC. The minimum operating voltage range

after startup is 11 V to 18 V.

Vref

This is the 5.0 V reference output. It provides charging current for capacitor CT through

resistor RT and can be used to bias any additional system circuitry.

14

MOTOROLA ANALOG IC DEVICE DATA

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