1 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 (UVLO) for Low-V_CC Conditions

2 Applications

• White Goods
• Power Supplies: AC/DC, Isolated,
  With PFC, > 90 W
• Server PSUs
• Solar Micro-Inverters
• Power Supplies: AC/DC, Isolated,
  No PFC, < 90 W
• Power: Telecom/Server AC/DC Supplies
• Solar Power Inverters

3 Description

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 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.

Block Diagram

For OUTPUT CTRL function, see Table 1.