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TL1454CN Scheda tecnica(PDF) 1 Page - Texas Instruments |
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TL1454CN Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 24 page TL1454, TL1454Y DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM) CONTROL CIRCUIT SLVS086B – APRIL 1995 – REVISED NOVEMBER 1997 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 D Two Complete PWM Control Circuits D Outputs Drive MOSFETs Directly D Oscillator Frequency...50 kHz to 2 MHz D 3.6-V to 20-V Supply-Voltage Range D Low Supply Current... 3.5 mA Typ D Adjustable Dead-Time Control, 0% to 100% D 1.25-V Reference description The TL1454 is a dual-channel pulse-width-modu- lation (PWM) control circuit, primarily intended for low-power, dc/dc converters. Applications include LCD displays, backlight inverters, notebook com- puters, and other products requiring small, high-frequency, dc/dc converters. Each PWM channel has its own error amplifier, PWM comparator, dead-time control comparator, and MOSFET driver. The voltage reference, oscillator, undervoltage lockout, and short-circuit protection are common to both channels. Channel 1 is configured to drive n-channel MOSFETs in step-up or flyback converters, and channel 2 is configured to drive p-channel MOSFETs in step-down or inverting converters. The operating frequency is set with an external resistor and an external capacitor, and dead time is continuously adjustable from 0 to 100% duty cycle with a resistive divider network. Soft start can be implemented by adding a capacitor to the dead-time control (DTC) network. The error-amplifier common-mode input range includes ground, which allows the TL1454 to be used in ground-sensing battery chargers as well as voltage converters. AVAILABLE OPTIONS PACKAGED DEVICES† CHIP FORM TA SMALL OUTLINE (D) PLASTIC DIP (N) TSSOP (PW) CHIP FORM (Y) –20 °C to 85°C TL1454CD TL1454CN TL1454CPWLE TL1454Y –40 °C to 85°C TL1454ID TL1454IN — — † The D package is available taped and reeled. Add the suffix R to the device name (e.g., TL1454CDR). The PW package is available only left-end taped and reeled (indicated by the LE suffix on the device type; e.g., TL1454CPWLE). Copyright © 1997, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CT RT DTC1 IN1 + IN1 – COMP1 GND OUT1 D, N OR PW PACKAGE (TOP VIEW) REF SCP DTC2 IN2 + IN2 – COMP2 VCC OUT2 |
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