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> TL594CN pulse width modulation pwm control circuit (20)
TL594CN pulse width modulation pwm control circuit (20)
Pulse Width Modulation Control Circuit
TL594CN, Pulse Width Modulation (PWM) Control Circuit, 16 Pin DIP, Quantity 20, Texas Instruments.
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.
* 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
