Voltage Mode PWM Controller 40V 200mA 16-Pin SOIC T/R

The TL594 device 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 device 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 device is characterized for operation from 0°C to 70°C. The TL594I device is characterized for operation from –40°C to 85°C. 

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-V_CC Conditions