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CS3842BGN8 Datasheet(PDF) 4 Page - ON Semiconductor |
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CS3842BGN8 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 8 page Undervoltage Lockout During Undervoltage Lockout (Figure 1), the output driv- er is biased to a high impedance state. VOUT should be shunted to ground with a resistor to prevent output leak- age 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 con- trol, 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 4 Test Circuit VREF VCC VOUT 1k Ω 1W 0.1 µF 0.1 µF VREF VCC VOUT Gnd VFB Sense OSC COMP 5k Ω 100k Ω 4.7k Ω 1k Ω ERROR AMP ADJUST 4.7k Ω Sense ADJUST RT 2N2222 CT Gnd A CS-3842B CS-3843B Circuit Description Typical Performance Characteristics: Oscillator Duty Cycle vs RT Oscillator Frequency vs CT VCC ON/OFF Command to reset of IC VON 16V 8.4V VOFF 10V 7.6V CS3842B CS3843B <0.5mA <15mA VON VOFF ICC VCC Figure 1: Typical Undervoltage 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 |
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