Texas Instruments TL598 pdf datasheet download

TL598

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

description/ordering information

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.

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