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UC3524DW Datenblatt(PDF) 5 Page - Texas Instruments |
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UC3524DW Datenblatt(HTML) 5 Page - Texas Instruments |
5 / 8 page 5 UC1524 UC2524 UC3524 Oscillator The oscillator controls the frequency of the UC1524 and is programmed by RT and CT according to the approximate formula: f RC TT ′ 1.18 where RT is in kΩ where CT is in mF where f is in kHz Practical values of CT fall between 0.001mF and 0.1mF. Practical values of RT fall between 1.8kΩ and 100kΩ. This results in a frequency range typically from 120Hz to 500kHz. Blanking The output pulse of the oscillator is used as a blanking pulse at the output. This pulse width is controlled by the value of CT. If small values of CT are required for fre- quency control, the oscillator output pulse width may still be increased by applying a shunt capacitance of up to 100pF from pin 3 to ground. If still greater dead-time is re- quired, it should be accomplished by limiting the maxi- mum duty cycle by clamping the output of the error amplifier. This can easily be done with the circuit in Fig- ure 1: Synchronous Operation When an external clock is desired, a clock pulse of ap- proximately 3V can be applied directly to the oscillator output terminal. The impedance to ground at this point is approximately 2k Ω. In this configuration RT CT must be selected for a clock period slightly greater than that of the external clock. If two or more UC1524 regulators are to operated synchro- nously, all oscillator output terminals should be tied to- gether, all CT terminals connected to single timing capacitor, and the timing resistor connected to a single RT, terminal. The other RT terminals can be left open or shorted to VREF. Minimum lead lengths should be used between the CT ter- minals. APPLICATION INFORMATION 16 V REF COMP 5k 9 GND 8 1N916 Figure 1. Error amplifier clamp. Figure 2. Single-ended LC switching regulator circuit. |
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