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CS5151H Scheda tecnica(PDF) 6 Page - ON Semiconductor |
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CS5151H Scheda tecnica(HTML) 6 Page - ON Semiconductor |
6 / 16 page CS5151H http://onsemi.com 6 − + − + − + VCC1 SS VID0 VID1 VID2 VID3 VFFB Low Comparator VFFB Fast Feedback LGND Slow Feedback PWM Comparator SS Low Comparator SS High Comparator 4 BIT DAC VCC1 Monitor Comparator Error Amplifier VCC2 COFF VGATE FAULT FAULT FAULT Latch PGND R S Q Q R S Q Q R S Q Latch PMW COFF One Shot Off−Time Timeout Time−Out Timer Edge Triggered Extended Off−Time Timeout Normal Off−Time Timeout Maximum On−Time Timeout (30 μs) GATE = ON GATE = OFF 2.0 μA 60 μA 5.0 V 0.7 V 2.5 V 1.0 V − + − + + − 3.90 V 3.85V VFB COMP Figure 2. Block Diagram PWM COMP APPLICATIONS INFORMATION THEORY OF OPERATION V2 Control Method The V2 method of control uses a ramp signal that is generated by the ESR of the output capacitors. This ramp is proportional to the AC current through the main inductor and is offset by the value of the DC output voltage. This control scheme inherently compensates for variation in either line or load conditions, since the ramp signal is generated from the output voltage itself. This control scheme differs from traditional techniques such as voltage mode, which generates an artificial ramp, and current mode, which generates a ramp from inductor current. Figure 3. V2 Control Diagram COMP VFFB Reference Voltage + + PWM Comparator Ramp Signal Error Amplifier Error Signal Output Voltage Feedback VFB VGATE E C − − |
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