TL594 Texas Instruments TI pdf datasheet download

TL594
PULSE-WIDTH-MODULATION CONTROL CIRCUIT

Features

· Complete PWM Power-Control Circuitry
· Uncommitted Outputs for 200-mA Sink or
Source Current
· Output Control Selects Single-Ended or
Push-Pull Operation
· Internal Circuitry Prohibits Double Pulse at
Either Output
· Variable Dead Time Provides Control Over
Total Range
· Internal Regulator Provides a Stable 5-V
Reference Supply Trimmed to 1%
· Circuit Architecture Allows Easy
Synchronization
· Undervoltage Lockout for Low-VCC Conditions

Description

The TL594 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control
circuit on a single chip. Designed primarily for power-supply control, this device offers the systems engineer the
flexibility to tailor the power-supply control circuitry to a specific application.
The TL594 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator,
a pulse-steering control flip-flop, a 5-V regulator with a precision of 1%, an undervoltage lockout control circuit,
and output control circuitry.
The error amplifiers have a common-mode voltage range of –0.3 V to VCC – 2 V. The DTC comparator has a
fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating
RT to the reference output and providing a sawtooth input to CT, or it can be used to drive the common circuitry
in synchronous multiple-rail power supplies.
The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Each
device provides for push-pull or single-ended output operation, with selection by means of the output-control
function. The architecture of these devices prohibits the possibility of either output being pulsed twice during
push-pull operation. The undervoltage lockout control circuit locks the outputs off until the internal circuitry is
operational.
The TL594C is characterized for operation from 0°C to 70°C. The TL594I is characterized for operation from
–40°C to 85°C.

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