Datenblatt-Suchmaschine für elektronische Bauteile |
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UC1823AL Datenblatt(PDF) 1 Page - Texas Instruments |
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UC1823AL Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 18 page UC1823A,UC2823A,UC2823B, UC3823A,UC3823B,UC1825A, UC2825A,UC2825B,UC3825A,UC3825B SLUS334D − AUGUST 1995 − REVISED NOVEMBER 2008 HIGHSPEED PWM CONTROLLER FEATURES D Improved Versions of the UC3823/UC3825 PWMs D Compatible with Voltage-Mode or Current-Mode Control Methods D Practical Operation at Switching Frequencies to 1 MHz D 50-ns Propagation Delay to Output D High-Current Dual Totem Pole Outputs (2-A Peak) D Trimmed Oscillator Discharge Current D Low 100-µA Startup Current D Pulse-by-Pulse Current Limiting Comparator D Latched Overcurrent Comparator With Full Cycle Restart DESCRIPTION The UC3823A and UC3823B and the UC3825A and UC3825B family of PWM controllers are improved versions of the standard UC3823 and UC3825 family. Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12 MHz, while input offset voltage is 2 mV. Current limit threshold is assured to a tolerance of 5%. Oscillator discharge current is specified at 10 mA for accurate dead time control. Frequency accuracy is improved to 6%. Startup supply current, typically 100 µA, is ideal for off-line applications. The output drivers are redesigned to actively sink current during UVLO at no expense to the startup current specification. In addition each output is capable of 2-A peak currents during transitions. BLOCK DIAGRAM 4 5 6 7 3 2 1 OSC CLK/LEB RT CT RAMP EAOUT NI INV 8 9 15 SS ILIM VCC 1.25 V 10 GND (60%) 1.0 V E/A 1.2 V 0.2 V OVER CURRENT CURRENT LIMIT R SD 5 V SOFT−START COMPLETE R SD FAULT LATCH RESTART DELAY T 13 11 14 VC 12 PWM LATCH 9 mA 250 mA R S * RESTART DELAY LATCH VREF 5.1 V ON/OFF UVLO 4 V INTERNAL BIAS 16 OUTA OUTB PGND 5.1 VREF ”B” 16V/10V ”A” 9.2V/8.4V PWM COMPARATOR UDG−02091 VREF GOOD * On the UC1823A version, toggles Q and Q are always low. 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. www.ti.com Copyright 2004 −2008, 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. |
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