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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS52845ED8 датащи(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS52845ED8 датащи(HTML) 4 Page - Cherry Semiconductor Corporation |
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4 / 6 page  Undervoltage Lockout During Undervoltage Lockout (Figure 1), the output driv- er is biased to sink minor amounts of current. The output should be shunted to ground with a resistor to prevent activating the power switch with extraneous leakage cur- rents. 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 transformer saturation in some power supplies, the inter- nal oscillator waveform provides the maximum duty cycle clamp as programmed by the selection of OSC compo- nents. 4 Figure 1: Startup voltage for the CS52845. Circuit Description Test Circuit Open Loop Laboratory Test Fixture 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 VCC VON = 8.4V VOFF = 7.6V ON/OFF Command to reset of IC <15mA <1mA VON VOFF ICC VCC |
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