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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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UC3524DWTR 데이터시트(PDF) 6 Page - Texas Instruments |
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UC3524DWTR 데이터시트(HTML) 6 Page - Texas Instruments |
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6 / 18 page  www.ti.com APPLICATION INFORMATION OSCILLATOR SYNCHRONOUS OPERATIONS f 1.18 R T C T (1) BLANKING REF COMP 9 GND 8 1N916 16 5 k V+ +28 V V− 1 2 16 6 7 3 10 15 12 11 13 14 4 5 9 9 5 k R2 5 k 5 k 0.1 mF 5 k 3 k 0.02 mF 500 mF 1.5 k 0.001 mF 50 k 0.1 UC1524 PIC600 +5V, 5A UC1524 UC2524 UC3524 SLUS180E – NOVEMBER 1999 – REVISED OCTOBER 2005 The oscillator controls the frequency of the UC1524 When an external clock is desired, a clock pulse of and is programmed by RT and CT according to the approximately 3 V can be applied directly to the approximate formula: oscillator output terminal. The impedance to ground at this point is approximately 2 k Ω. In this configuration RT CT must be selected for a clock period slightly greater than that of the external clock. where If two or more UC1524 regulators are to operated RT is in kΩ synchronously, all oscillator output terminals should be tied together, all CT terminals connected to single CT is in µF timing capacitor, and the timing resistor connected to f is in kHz a single RT, terminal. Practical values of CT fall between 1 nF and 100 nF. Practical values of RT fall between 1.8 kΩ and 100 k Ω. This results in a frequency range typically from 120 Hz to 500 kHz. The output pulse of the oscillator is used as a blanking pulse at the output. This pulse width is Figure 5. Error Amplifier Clamp controlled by the value of CT. If small values of CT are required for frequency control, the oscillator output pulse width may still be increased by applying a shunt The other RT terminals can be left open or shorted to capacitance of up to 100 pF from pin 3 to ground. If VREF. Minimum lead lengths should be used between still greater dead-time is required, it should be the CT terminals. accomplished by limiting the maximum duty cycle by clamping the output of the error amplifier. This can easily be done with the circuit in Figure 5. Figure 6. Single-Ended LC Switching Regulator Circuit 6 |
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