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UC3527AN Scheda tecnica(PDF) 1 Page - Texas Instruments |
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UC3527AN Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 17 page 1 FEATURES DESCRIPTION BLOCK DIAGRAM 15 12 3 6 5 7 9 1 2 8 10 Reference Regulator 16 4 OSC 50 m A 13 14 11 13 11 14 COMP S S R +VIN GROUND SYNC RT CT DISCHARGE COMPENSATION INV INPUT NI INPUT SOFTSTART SHUTDOWN OUTPUT B OUTPUT A VC OUTPUT B OUTPUT A VC NOR NOR OR OR VREF Error Amp VREF OSC OUT To Internal Circutry UVLO Lockout Flip Flop PWM Latch 3 kW 5 kW UC1527A Output Stage UC1525A Output Stage UC1525A, UC1527A UC2525A, UC2527A UC3525A, UC3527A SLUS191C – FEBRUARY 1997 – REVISED JANUARY 2008 www.ti.com REGULATING PULSE WIDTH MODULATORS • 8-V to 35-V Operation • 5.1-V Reference Trimmed to 1% The UC1525A/1527A series of pulse width modulator integrated circuits are designed to offer improved • 100-Hz to 500-kHz Oscillator Range performance and lowered external parts count when • Separate Oscillator Sync Terminal used in designing all types of switching power • Adjustable Deadtime Control supplies. The on-chip +5.1-V reference is trimmed to 1% and the input common-mode range of the error • Internal Soft-Start amplifier includes the reference voltage, eliminating • Pulse-by-Pulse Shutdown external resistors. A sync input to the oscillator allows • Input Undervoltage Lockout With Hysteresis multiple units to be slaved or a single unit to be synchronized to an external system clock. A single • Latching PWM to Prevent Multiple Pulses resistor between the CT and the discharge terminals • Dual Source/Sink Output Drivers provides a wide range of dead-time adjustment. These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A shutdown terminal controls both the soft-start circuitry and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown, as well as soft-start recycle with longer shutdown commands. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 1997–2008, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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