DESCRIPTION

The DP8600C incorporate on a single monolithic chip all

the functions required in the construction of a pulsewidth

modulation control circuit.Designed primarily for power

supply control, the device offers the systems engineer the

flexibility to tailor the power supply control circuitry to its

application.

The DP8600C contains an error amplifier,currentlimiting

amplifier, an onchip

adjustable oscillator, a dead time

control comparator,pulsesteering

control flipflop,

a 5volt

,1 precision supply regulator,and output control

circuits.

The error amplifier exhibits a commonmode

Voltage

range from 0.3V

to VCC2V.

The currentlimit

amplifier

exhibits a commonmode

Voltage range from 0.3V

to 3V

with an offset Voltage of approximately 80 mV in series

with the inverting input to ease circuit design requirements.

The deadtime

control comparator has a fixed offset that

provides approximately 5 dead time when externally

altered. The onchip

oscillator may be bypassed by

terminating RT(pin 6) to the reference output and providing

a sawtooth Input to CT(pin 5),or it may be used to drive the

common circuits in synchronous multiplerail

power

supplies.

The Uncommitted output transistors provide either

commonemitter

or emitterfollower

output capability.Each

device provides for pushpull

or singleended

output

operation,which may be selected through the outputcontrol

function. the architecture of these devices prohibits the

possibility of either being pulsed twice during pushpull

operation.

FEATURES

* Complete PWM Power Control Circuitry

* Uncommitted Outputs for 200 mA Sink or

Source Current

* Output Control Selects singleEnded

or

PushPull

Operation

* Internal Circuitry Prohibits Double control

Over

Total Range

* Circuit architecture Allows easy Synchron Ization

* Undervoltage Lockout