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NCL30000
Table 1. PIN FUNCTION DESCRIPTION
Pin
1
2
3
4
5
6
7
8
Name
MFP
COMP
C t
CS
ZCD
GND
DRV
V CC
Function
The multi-function pin is connected to the internal error amplifier. By pulling this pin below the V uvp 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.
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).
The C t pin sources a regulated current to charge an external timing capacitor. The PWM circuit controls the power
switch on time by comparing the C t voltage to an internal voltage derived from V Control . The C T pin discharges the
external timing capacitor at the end of the on time cycle.
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.
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.
This is the analog ground for the device. All bypassing components should be connected to the GND pin with a short
trace length.
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 V CC(on) is not reached.
This pin is the positive supply of the controller. The circuit starts to operate when V CC exceeds V CC(on) , nominally
12 V and turns off when V CC goes below V CC(off) , typically 9.5 V. After startup, the operating range is 10.2 V up to
20 V.
AC
Line
Input
EMI
FILTER
D out
C in
R SU
Ra
D1
Cv
Rb
Rx
8
VCC
RL
OUT2
+
IN2+ 5
R1
R ZCD
7
?
IN2 ? 6
Rt
NCL30000
NCS1002
1
MFP
VCC
8
C1
Q1
OUT1
? IN1 ?
2
R2
Ccomp
2
COMP
DRV
7
1
+
IN1+ 3
3
CT
GND
6
Cc
GND
4
Ry
4
CS
ZCD
5
C tim
C OUT
R CS
Figure 2. Simplified Flyback Application with Secondary side Constant Current Control
http://onsemi.com
3
Rc
RLED
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