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UC3525 Datasheet(PDF) 5 Page - Texas Instruments |
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UC3525 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 14 page 5 UC1525B UC1527B UC2525B UC2527B UC3525B UC3527B PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS 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 cir- cuitry of Pin 10 which has been improved to enhance the available shutdown options. Activating this circuit by ap- plying a positive signal on Pin 10 performs two functions: the PWM latch is immediately set providing the fastest turn-off signal to 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. UDG-95060 UDG-95061 The low source impedance of the output drivers provides rapid charging of power FET input capacitance while mini- mizing external components. Low power transformers can be driven directly by the UC1525B. Automatic reset occurs during dead time, when both ends of the primary winding are switched to ground. UDG-95062 UC1525B Oscillator Schematic |
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