NCL30000(2009) 데이터 시트보기 (PDF) - ON Semiconductor

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NCL30000
(Rev.:2009)

Power Factor Corrected Dimmable LED Driver

ON Semiconductor 

NCL30000

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 is connected between this pin

and ground to set the loop bandwidth. Normally this bandwidth is set at a low frequency (typically 10 Hz − 20 Hz) to

achieve high power factor and low total harmonic distortion (THD).

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 is used to sense the instantaneous switch current in the external MOSFET. This signal is filtered by an

internal leading edge blanking circuit.

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 has been demagnetized, 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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