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UC3823B датащи(PDF) 1 Page - Texas Instruments |
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UC3823B датащи(HTML) 1 Page - Texas Instruments |
1 / 9 page FEATURES • Improved versions of the UC3823/UC3825 PWMs • Compatible with Voltage or Current-Mode Topologies • Practical Operation at Switching Frequencies to 1MHz • 50ns Propagation Delay to Output • High Current Dual Totem Pole Outputs (2A Peak) • Trimmed Oscillator Discharge Current • Low 100 µA Startup Current • Pulse-by-Pulse Current Limiting Comparator • Latched Overcurrent Comparator With Full Cycle Restart UC1823A,B/1825A,B UC2823A,B/2825A,B UC3823A,B/3825A,B High Speed PWM Controller DESCRIPTION The UC3823A & B and the UC3825A & B family of PWM control ICs are im- proved versions of the standard UC3823 & UC3825 family. Performance en- hancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12MHz while input offset voltage is 2mV. Current limit threshold is guaranteed to a tolerance of 5%. Oscillator discharge current is spec- ified at 10mA 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 2A peak currents during transitions. Functional improvements have also been implemented in this family. The UC3825 shutdown comparator is now a high-speed overcurrent comparator with a threshold of 1.2V. The overcurrent comparator sets a latch that ensures full discharge of the soft start capacitor before allowing a restart. While the fault latch is set, the outputs are in the low state. In the event of continuous faults, the soft start capacitor is fully charged before discharge to insure that the fault frequency does not exceed the designed soft start period. The UC3825 Clock pin has be- come CLK/LEB. This pin combines the functions of clock output and leading edge blanking adjustment and has been buffered for easier interfacing. * Note: 1823A,B Version Toggles Q and Q are always low 9/95 BLOCK DIAGRAM continued UDG-95101 |
Аналогичный номер детали - UC3823B |
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Аналогичное описание - UC3823B |
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