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CS3842AGD14 датащи(PDF) 6 Page - ON Semiconductor |
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CS3842AGD14 датащи(HTML) 6 Page - ON Semiconductor |
6 / 10 page CS2842A, CS3842A, CS2843A, CS3843A http://onsemi.com 6 Figure 4. Test Circuit VREF VCC VOUT GND COMP VFB Sense OSC 0.1 μF 0.1 μF RT 1.0 kΩ 1.0 W 2N2222 100 kΩ VCC VREF VOUT GND A 5.0 kΩ Sense ADJUST CT 4.7 kΩ 4.7 kΩ 1.0 kΩ ERROR AMP ADJUST CIRCUIT DESCRIPTION CSX843A 8.4 V 7.6 V CSX842A 16 V 10 V VON VOFF ON/OFF Command to reset of IC VCC < 1.0 mA < 15 mA VON VOFF VCC ICC Figure 5. Typical Undervoltage Characteristics Undervoltage Lockout During Undervoltage Lockout (Figure 5), the output driver is biased to a high impedance state. The output should be shunted to ground with a resistor to prevent output leakage current from activating the power switch. PWM Waveform To generate the PWM waveform, the control voltage from the error amplifier is compared to a current sense signal which represents the peak output inductor current (Figure 6). An increase in VCC causes the inductor current slope to increase, thus reducing the duty cycle. This is an inherent feed−forward characteristic of current mode control, since the control voltage does not have to change during changes of input supply voltage. Figure 6. Timing Diagram for Key CS2841B Parameters Switch Current EA Output VCC IO VO OSC RESET OSC When the power supply sees a sudden large output current increase, the control voltage will increase allowing the duty cycle to momentarily increase. Since the duty cycle tends to exceed the maximum allowed to prevent transformer saturation in some power supplies, the internal oscillator waveform provides the maximum duty cycle clamp as programmed by the selection of oscillator components. Setting the Oscillator Oscillator timing capacitor, CT, is charged by VREF through RT and discharged by an internal current source. During the discharge time, the internal clock signal blanks out the output to the Low state, thus providing a user selected maximum duty cycle clamp. Charge and discharge times are determined by the formula: |
Аналогичный номер детали - CS3842AGD14 |
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Аналогичное описание - CS3842AGD14 |
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