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NCP3101 Datasheet(PDF) 2 Page - ON Semiconductor |
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NCP3101 Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 18 page NCP3101 http://onsemi.com 2 Figure 2. Detailed Block Diagram - + - + - + - + - + - + 13 24 21 25 26-37 VCC BST TGOUT TGIN PWRVCC 16 17 FB COMP DIS 1-4 36-40 22 PWRPHS CPHS 14,15,19,20,23 35 5-12 AGND BG PWRGND R S Q PWM OUT LATCH OSC OSC RAMP CLOCK POR UVLO 0.8V 0.4V 50mV-550mV VOCTH FAULT VCC FAULT FAULT 2V VOCTH SET 2V 10 mA Vref CPHS FAULT PIN FUNCTION DESCRIPTION Pin No Symbol Description 1-4 , 36-40 PWRPHS Power phase node. Drain of the low side power MOSFET and source of the high side MOSFET. 5-12 PWRGND Power ground. Source of the low side power MOSFET. Connected with large copper area. High current return for the low side MOSFET. 13 VCC Supply for the internal driver. Decouple with a 0.1 mF - 1 mF capacitor to AGND as close to the IC as possible. 14,15,19,20,23 AGND Internal driver ground. Reference ground for FB, COMP and other driver circuits. 16 FB The input pin to the error amplifier.(inverted input error amplifier) Connect this pin to the output resistor divider (if used) or directly to the output voltage near the load connection. 17 COMP/DIS Compensation or disable pin. (output error amplifier) Use this pin to compensate the voltage control feedback loop. The compensation capacitor also acts as a soft-start capacitor. Pulling the pin below 400 mV will disable the controller. 18 NC No connect. This pin can be connected to AGND or not connected. 21 TGOUT Output high side MOSFET driver. Connect to pin 25 with compensation circuit if used. 22 CPHS The controller phase sensing. 24 BST Supply rail for the floating top gate driver. 25 TGIN Gate high side MOSFET 26-34 PWRVCC Input supply pins for the high side MOSFET. (Drain) 35 BG The current limit set pin. |
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