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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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NCP1237 датащи(PDF) 16 Page - ON Semiconductor |
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NCP1237 датащи(HTML) 16 Page - ON Semiconductor |
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16 / 34 page  NCP1237 http://onsemi.com 16 CURRENT−MODE CONTROL WITH OVERPOWER COMPENSATION AND SOFT−START Current Sensing NCP1237 is a current−mode controller, which means that the FB voltage sets the peak current flowing in the inductance and the MOSFET. This is done through a PWM comparator: the current is sensed across a resistor and the resulting voltage is applied to the CS pin. VCS is applied to one input of the PWM comparator through the LEB block. On the other input the FB voltage divided by KFB sets the threshold: when VCS reaches this threshold, the output driver is turned off. The maximum value for the peak current, VILIM, is set by a dedicated comparator. Figure 11. Current Sense Block Schematic CS FB − + tLEB blanking KFB VDD RFB(up) − + − + − + + + VILIM VCS(stop) S R Q tSSTART Soft−start ramp Start Reset IC Start IC Stop Oscillator DCMAX Protection Mode UVLO Jitter HV stop Latch Soft−start IC stop TSD Fault DRV Stage blanking PWM tBCS |
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