TL598 (ACTIVE)

Pulse-Width-Modulation (Pwm) Control Circuit

Pulse-Width-Modulation (Pwm) Control Circuit - TL598
Datasheet
 

Description

The TL598 incorporates all the functions required in the construction of pulse-width-modulated (PWM) controlled systems on a single chip. Designed primarily for power-supply control, the TL598 provides the systems engineer with the flexibility to tailor the power-supply control circuits to a specific application.

The TL598 contains two error amplifiers, an internal oscillator (externally adjustable), a dead-time control (DTC) comparator, a pulse-steering flip-flop, a 5-V precision reference, undervoltage lockout control, and output control circuits. Two totem-pole outputs provide exceptional rise- and fall-time performance for power FET control. The outputs share a common source supply and common power ground terminals, which allow system designers to eliminate errors caused by high current-induced voltage drops and common-mode noise.

The error amplifier has a common-mode voltage range of 0 V to VCC - 2 V. The DTC comparator has a fixed offset that prevents overlap of the outputs during push-pull operation. A synchronous multiple supply operation can be achieved by connecting RT to the reference output and providing a sawtooth input to CT.

The TL598 device provides an output control function to select either push-pull or parallel operation. Circuit architecture prevents either output from being pulsed twice during push-pull operation. The output frequency for push-pull applications is one-half the oscillator frequency (fo=1/2 RT CT). For single-ended applications: (fo=1/RT CT)

Features

  • Complete PWM Power-Control Function
  • Totem-Pole Outputs for 200-mA Sink or Source Current
  • Output Control Selects Parallel 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% Tolerance
  • On-Board Output Current-Limiting Protection
  • Undervoltage Lockout for Low VCC Conditions
  • Separate Power and Signal Grounds

View more

Parametrics Compare all products in PWM and Resonant Controller

 
Topology
Control Method
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Features
Rating
Operating Temperature Range (C)
Pin/Package
TL598
Boost
Buck
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull   
Voltage   
0   
38   
300   
4/6   
45   
0.2   
Adjustable Switching Frequency
Error Amplifier
Multi-topology   
Catalog   
0 to 70   
16PDIP
16SOIC