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NCL30002

Power Factor Corrected Buck LED Driver

ON Semiconductor 

NCL30002

Table 1. PIN FUNCTION DESCRIPTION

Pin Name

Function

1

MFP The multi−function pin is connected to the internal error amplifier. By pulling this pin below the Vuvp threshold, the

controller is disabled. In addition, this pin also has an over voltage comparator which will disable the controller in the

event of a fault.

2 COMP The COMP pin is the output of the internal error amplifier. A compensation network connected between this pin and

ground sets the loop bandwidth.

3

Ct

The Ct pin sources a regulated current to charge an external timing capacitor. The PWM circuit controls the power

switch on time by comparing the Ct voltage to an internal voltage derived from VControl. The CT pin discharges the

external timing capacitor at the end of the on time cycle.

4

CS

The CS input threshold is precisely trimmed to accurately sense the instantaneous switch current in the external

MOSFET. This signal is conditioned by an internal leading edge blanking circuit. The current limit threshold is tightly

trimmed for precise peak current control.

5

ZCD The voltage of an auxiliary zero current detection winding is sensed at this pin. When the ZCD control block circuit

detects that the winding current has gone to zero, a control signal is sent to the gate drive block to turn on the

external MOSFET.

6

GND This is the analog ground for the device. All bypassing components should be connected to the GND pin with a short

trace length.

7

DRV The high current capability of the totem pole gate drive (+0.5/−0.8 A) makes it suitable to effectively drive high gate

charge power MOSFETs. The driver stage provides both passive and active pull down circuits that force the output to

a voltage less than the turn−on threshold voltage of the power MOSFET when VCC(on) is not reached.

8

VCC This pin is the positive supply of the controller. The circuit starts to operate when VCC exceeds VCC(on), nominally

12 V and turns off when VCC goes below VCC(off), typically 9.5 V. After startup, the operating range is 10.2 V up to

20 V.

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