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TL497A Datasheet

Part Number TL497A
Manufacturers Texas Instruments
Logo Texas Instruments
Description SWITCHING VOLTAGE REGULATORS
Datasheet TL497A DatasheetTL497A Datasheet (PDF)

ą TL497A 500ĆmA PEAK STEPĆUP, STEPĆDOWN, INVERTING SWITCHING VOLTAGE REGULATOR SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005 D High Efficiency . . . 60% or Greater D Peak Switch Current . . . 500 mA D Input Current Limit Protection D TTL-Compatible Inhibit D Adjustable Output Voltage D Input Regulation . . . 0.2% Typ D Output Regulation . . . 0.4% Typ D Soft Start-Up Capability D Can be Used in Buck, Boost, and Inverting Configurations description/ordering information D, N, OR PW PACKAGE (TOP .

  TL497A   TL497A






SWITCHING VOLTAGE REGULATORS

ą TL497A 500ĆmA PEAK STEPĆUP, STEPĆDOWN, INVERTING SWITCHING VOLTAGE REGULATOR SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005 D High Efficiency . . . 60% or Greater D Peak Switch Current . . . 500 mA D Input Current Limit Protection D TTL-Compatible Inhibit D Adjustable Output Voltage D Input Regulation . . . 0.2% Typ D Output Regulation . . . 0.4% Typ D Soft Start-Up Capability D Can be Used in Buck, Boost, and Inverting Configurations description/ordering information D, N, OR PW PACKAGE (TOP VIEW) COMP INPUT INHIBIT FREQ CONTROL SUBSTRATE GND CATHODE ANODE 1 2 3 4 5 6 7 14 VCC 13 CUR LIM SENS 12 BASE DRIVE† 11 BASE† 10 COL OUT 9 NC 8 EMIT OUT NC − No internal connection † BASE (11) and BASE DRIVE (12) are used for device testing only. They normally are not used in circuit applications of the device. The TL497A incorporates all the active functions required in the construction of switching voltage regulators. It also can be used as the control element to drive external components for high-power-output applications. The TL497A was designed for ease of use in step-up, step-down, or voltage-inversion applications requiring high efficiency. The TL497A is a fixed-on-time variable-frequency switching-voltage-regulator control circuit. The switch-on time is programmed by a single external capacitor connected between FREQ CONTROL and GND. This capacitor, CT, is charged by an internal constant-current generator to a predetermined threshold. The charging current and the thresho.


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