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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS2843A датащи(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS2843A датащи(HTML) 4 Page - Cherry Semiconductor Corporation |
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4 / 6 page  4 VREF VCC VOUT 1kΩ 1W 0.1µF 0.1µF VREF VCC VOUT Gnd VFB Sense OSC COMP 5kΩ 100kΩ 4.7kΩ 1kΩ ERROR AMP ADJUST 4.7kΩ Sense ADJUST RT 2N2222 CT Gnd A Test Circuit Undervoltage Lockout During Undervoltage Lockout (Figure 1), the output driv- er 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 2). 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. When the power supply sees a sudden large output cur- rent 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 trans- VCC ON/OFF Command to reset of IC VON 16V 8.4V VOFF 10V 7.6V CSX842A CSX843A <15mA <1mA VON VOFF ICC VCC Circuit Description Typical Performance Characteristics .0005 .001 .002 .003 .005 .01 .02 .03 .04 800 900 CT (µF) 700 600 500 400 300 200 100 .05 RT =1.5kΩ RT =680Ω RT =10kΩ 100 200 700 1k 2k 5k 7k 10k 80 90 RT (Ω) 70 60 50 40 30 20 10 4k 3k 500 400 300 100 Oscillator Duty Cycle vs RT Oscillator Frequency vs CT Figure 1: Typical Undervoltage Characteristics |
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