NCP1230_08 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
NCP1230_08 Datasheet PDF : 21 Pages
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NCP1230
HV
1
8
2
7
+
3
6
CBulk
4
5
MC33262/33260
PFC_VCC
OVP
1
8
2
7
3
6
4
5
NCP1230
OVP
+
Vout
GN
D
Ramp Comp
10 k
VCC Cap
Rsense
GND
Figure 1. Typical Application Example
PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
Function
Pin Description
1
PFC VCC This pin provides This pin is a direct connection to the VCC pin (Pin 6) via a low impedance switch. In
the bias voltage to standby and during the startup sequence, the switch is open and the PFC VCC is
the PFC controller. shut down. As soon as the aux. winding is stabilized, Pin 1 connects to the VCC pin
and provides bias to the PFC controller. It goes down in standby and fault conditions.
2
FB
Feedback Signal An optocoupler collector pulls this pin low to regulate. When the current setpoint
reaches 25% of the maximum peak, the controller skips cycles.
3
CS/OVP Current Sense
This pin incorporates three different functions: the current sense function, an internal
ramp compensation signal and a 3.0 V latch-off level which latches the output off
until VCC is recycled.
4
GND
IC Ground
-
5
DRV
Driver Output
With a drive capability of +500 mA / -800 mA, the NCP1230 can drive large Qg
MOSFETs.
6
VCC
VCC Input
The controller accepts voltages up to 18 V and features a UVLO turn-off threshold of
7.7 V typical.
7
NC
-
-
8
HV
High-Voltage
This pin connects to the bulk voltage and offers a lossless startup sequence. The
charging current is high enough to support the bias needs of a PWM controller
through Pin 1.
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