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UC1827L-1 Folha de dados(PDF) 1 Page - Texas Instruments |
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UC1827L-1 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 15 page www.ti.com FEATURES DESCRIPTION RD Q S 20 DELAY 23 GND 11 VCC REF 15 RT 17 CT 18 SYNC 19 CSA− 9 CSA+ 8 SS 4 CSAO 7 CEA− 13 VEA− 16 VEA+ 14 22 24 3 2 1 RAMP CEA+ 12 CEAO VEAO 10 PULL PGND PUSH SRC BUCK V+ DELAY DELAY T Q Q REF & UVLO SS INHBT UV OSC 500 kHz MAX 6 5 21 Current Sense Amplifier ILIM Comparator +3 V Current Error Amplifier PWM Comparator 0.7 V Flying Driver Push/Pull Drivers OSC UVLO Voltage Error Amplifier UC1827-1, UC1827-2 UC2827-1, UC2827-2 UC3827-1, UC3827-2 SLUS365A – APRIL 1999 – REVISED AUGUST 2005 BUCK CURRENT/VOLTAGE FED PUSH-PULL PWM CONTROLLERS • Ideal for Multiple Output and/or High The UC3827 family of controller devices provides an Voltage Output Voltage Converters integrated control solution for cascaded buck and push-pull converters. These converters are known as • Up to 500 kHz Operation current fed or voltage fed push-pull converters and • High Voltage, High Current Floating are ideally suited for multiple output and/or high Driver for Buck Converter Stage voltage output applications. In both current fed and • UC3827-1 Current Fed Controller has voltage fed modes, the push-pull switches are driven Push-Pull Drivers with Overlapping at 50% nominal duty cycles and at one half the switching frequency of the buck stage. In the current Conduction Periods fed mode, the two switches are driven with a speci- • UC3827-2 Voltage Fed Controller has fied over-lap period to prevent ringing and voltage Push-Pull Drivers with Nonoverlapping stress on the devices. In the voltage fed mode, the Conduction Periods two switches are driven with a specified gap time • Average Current Mode, Peak Current between the switches to prevent shorting the trans- Mode or Voltage Mode with Input former across the energy storage capacitor and to prohibit excessive currents flowing through the de- Voltage Feedforward Control for Buck vices. Power Stage • Wide Bandwidth, Low Offset, The converter's output voltage is regulated by pulse Differential Current Sense Amplifier width modulation of the buck switch. The UC3827 contains complete protection and PWM control func- • Precise Short Circuit Current Control tions for the buck converter. Easy control of the floating switch is accomplished by the floating drive circuitry. The gate drive waveform is level shifted to support an input voltage up to 72 VDC. BLOCK DIAGRAM 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 © 1999–2005, 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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Descrição semelhante - UC1827L-1 |
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