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NCP1509MNR2 Datasheet(PDF) 2 Page - ON Semiconductor |
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NCP1509MNR2 Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 15 page NCP1509 http://onsemi.com 2 Figure 3. Simplified Block Diagram + − − + + − + − + − + − FB GNDA CB0 CB1 SHD ISENS ISENS SENFET ILIM ZCL MODE SELECTION SYNC DETECT AND TIMING BLOCK SYNC DETECT AND TIMING BLOCK THERMAL SHUTDOWN ENABLE DETECT SELECT LOGIC BANDGAP REFERENCE AND SOFT START PWM OVP PM CMP CMP CMP CMP CMP OA Q2 Q1 DVR DVR COMPENSATION RAMP CONTROL BLOCK (PWM,PM) GNDP SYNC LX VCCA VCCP FB DAMPING SWITCHING CONTROL DAMPING SWITCHING CONTROL 2 10 6 3 4 5 6 1 7 8 9 PIN FUNCTION DESCRIPTION Pin Number Name Type Description 1 GNDA Analog GND Ground connection for the Analog Section of the IC. This is the GND for the FB, SYNC, CB0, CB1, PG and ENABLE pins. 2 GNDP Power GND Ground connection for the N−FET Power Stage. 3 LX Power Output Connection from Power MOSFETs to the Inductor. 4 VCCP Power Input Power Supply Input for the Switching P−FET. 5 VCCA Power Input Power Supply Input for the Analog Section of the IC. 6 FB Analog Input Feedback voltage from the output of the power supply. 7 CB0 Analog Input Vout Selection Pin. This pin contains a pulldown resistor. 8 CB1 Analog Input Vout Selection Pin. This pin contains a pullup resistor. 9 SHD Analog Input Enable for Switching Regulator. This pin is active high to turn on the NCP1509. This pin contains an internal pulldown resistor. 10 SYNC Analog Input Synchronization input for the PWM converter. If a clock signal is present, the converter uses the rising edge for the turn on of the PFET. If this pin is low, the converter is in Low Iq Pulse mode. If this pin is high, the converter uses the internal oscillator for the PWM mode. This pin has an internal pulldown resistor to force the operation into the Pulse mode. |
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Similar Description - NCP1509MNR2 |
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