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MC33060AP Arkusz danych(PDF) 5 Page - ON Semiconductor |
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MC33060AP Arkusz danych(HTML) 5 Page - ON Semiconductor |
5 / 16 page MC34060A, MC33060A http://onsemi.com 5 Figure 1. Block Diagram + 6 5 4 RT CT Dead-Time Control Oscillator 0.12V 0.7V ≈ 0.7mA 1 12 3 2 Dead-Time Comparator PWM. Comparator 13 14 Reference Regulator 7 Gnd 10 12 9 8 Q1 Ref Out VCC Error Amp 1 Feedback/PWM Comparator Input Error Amp 2 + ++ - - -- Emitter Collector + - VTH Undervoltage Lockout This device contains 46 active transistors. Description The MC34060A is a fixed–frequency pulse width modulation control circuit, incorporating the primary building blocks required for the control of a switching power supply (see Figure 1). An internal–linear sawtooth oscillator is frequency–programmable by two external components, RT and CT. The approximate oscillator frequency is determined by: fosc ^ 1.2 RT • CT For more information refer to Figure 3. Output pulse width modulation is accomplished by comparison of the positive sawtooth waveform across capacitor CT to either of two control signals. The output is enabled only during that portion of time when the sawtooth voltage is greater than the control signals. Therefore, an increase in control–signal amplitude causes a corresponding linear decrease of output pulse width. (Refer to the Timing Diagram shown in Figure 2.) Figure 2. Timing Diagram Capacitor CT Feedback/P.W.M. Comparator Dead-Time Control Output Q1, Emitter |
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