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UC3827DW-1G4 Arkusz danych(PDF) 1 Page - Texas Instruments |
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UC3827DW-1G4 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 16 page 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 UC2827-1, UC2827-2 UC3827-1, UC3827-2 www.ti.com SLUS365D – APRIL 1999 – REVISED APRIL 2011 BUCK CURRENT/VOLTAGE FED PUSH-PULL PWM CONTROLLERS Check for Samples: UC2827-1, UC2827-2, UC3827-1, UC3827-2 1 FEATURES DESCRIPTION • 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 • Up to 500 kHz Operation push-pull converters. These converters are known as • High Voltage, High Current Floating current fed or voltage fed push-pull converters and Driver for Buck Converter Stage are ideally suited for multiple output and/or high 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 Conduction Periods switching frequency of the buck stage. In the current • UC3827-2 Voltage Fed Controller has fed mode, the two switches are driven with a Push-Pull Drivers with Nonoverlapping specified over-lap period to prevent ringing and Conduction Periods voltage stress on the devices. In the voltage fed mode, the two switches are driven with a specified • Average Current Mode, Peak Current gap time between the switches to prevent shorting Mode or Voltage Mode with Input the transformer across the energy storage capacitor Voltage Feedforward Control for Buck and to prohibit excessive currents flowing through the Power Stage devices. • 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 • Precise Short Circuit Current Control contains complete protection and PWM control functions 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 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 © 1999–2011, 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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