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UC1527AJ Datasheet(PDF) 6 Page - Texas Instruments |
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UC1527AJ Datasheet(HTML) 6 Page - Texas Instruments |
6 / 9 page 6 UC1525A/27A UC2525A/27A UC3525A/27A PRINCIPLES OF OPERATION AND TYPICAL CHARAC- TERISTIC SHUTDOWN OPTIONS (See Block Diagram) Since both the compensation and soft-start terminals (Pins 9 and 8) have current source pull-ups, either can readily accept a pull-down signal which only has to sink a maximum of 100 µA to turn off the outputs. This is subject to the added requirement of discharging whatever exter- nal capacitance may be attached to these pins. An alternate approach is the use of the shutdown circuitry of Pin 10 which has been improved to enhance the avail- able shutdown options. Activating this circuit by applying a positive signal on Pin 10 performs two functions; the PWM latch is immediately set providing the fastest turn-off signal to the outputs; and a 150 µA-current sink begins to discharge the external soft-start capacitor. If the shutdown command is short, the PWM signal is termi- nated without significant discharge of the soft-start ca- pacitor, thus, allowing, for example, a convenient implementation of pulse-by-pulse current limiting. Holding Pin 10 high for a longer duration, however, will ultimately discharge this external capacitor, recycling slow turn-on upon release. Pin 10 should not be left floating as noise pickup could conceivably interrupt normal operation. All transitions of the voltage on pin 10 should be within the time frame of one clock cycle and not repeated at a frequency higher than 10 clock cycles. UC1525A oscillator schematic. Oscillator Charge Time vs RT and CT. Oscillator Discharge Time vs RD and CT. |
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