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UC3524DWG4 датащи(PDF) 4 Page - Texas Instruments |
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UC3524DWG4 датащи(HTML) 4 Page - Texas Instruments |
4 / 18 page www.ti.com PRINCIPLES OF OPERATION UC1524 UC2524 UC3524 SLUS180E – NOVEMBER 1999 – REVISED OCTOBER 2005 flip-flop, which is synchronously toggled by the The UC1524 is a fixed-frequency pulse-width-modu- oscillator output. The oscillator output pulse also lation voltage regulator control circuit. The regulator serves as a blanking pulse to assure both outputs are operates at a frequency that is programmed by one never on simultaneously during the transition times. timing resistor (RT), and one timing capacitor (CT), RT The width of the blanking pulse is controlled by the establishes a constant charging current for CT. This valve of CT. The outputs may be applied in a results in a linear voltage ramp at CT, which is fed to push-pull configuration in which their frequency is half the comparator providing linear control of the output that of the base oscillator Note that for buck regulator pulse width by the error amplifier. The UC1524 topologies, the two outputs can be wire-ORed for an contains an on-board 5 V regulator that serves as a effective 0-90% duty cycle range. With this reference as well as powering the UC1524’s internal connection, the output frequency is the same as the control circuitry and is also useful in supplying oscillator frequency. The output of the error amplifier external support functions. This reference voltage is shares a common input to the comparator with the lowered externally by a resistor divider to provide a current limiting and shutdown circuitry and can be reference within the common-mode range of the error overridden by signals from either of these inputs. This amplifier or an external reference may be used. The common point is also available externally and may be power supply output is sensed by a second resistor employed to control the gain of, or to compensate, divider network to generate a feedback signal to the the error amplifier or to provide additional control to error amplifier. The amplifier output voltage is then the regulator. compared to the linear voltage ramp at CT. The resulting modulated pulse out of the high-gain comparator is then steered to the appropriate output pass transistor (Q1 or Q2) by the pulse-steering 4 |
Аналогичный номер детали - UC3524DWG4 |
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Аналогичное описание - UC3524DWG4 |
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