ncp1231d65r2g ON Semiconductor, ncp1231d65r2g Datasheet - Page 2

• Manufacturer Part Number: ncp1231d65r2g
• Description: Lowstandby Power High Performance Pwm Controller
• Manufacturer: ON Semiconductor

PIN FUNCTION DESCRIPTION
Pin No.
HV
+
1
2
3
4
5
6
7
8
to PFC’s V
(SoftïStart)
Pin Name
PFC V
BO/OVP
GND
DRV
V
CS
SS
FB
CC
CC
CC
Directly powers the PFC
frontïend stage
Feedback Signal
Current Sense
IC Ground
Driver Output
V
To provide an internal
ramp timing for different
usages
BrownïOut and OVP
CC
Input
Function
1
2
3
4
NCP1231
Figure 1. Typical Application Example
Ramp
This pin provides three different functions, via a capacitor to ground, saw tooth
signal whose function is to create a softïstart, frequency dithering and 100 msec
fault timer.
BO/OVP
This pin is a direct connection to the V
In standby and during the startup sequence, the switch is open and the PFC V
is shutdown. As soon as the aux. winding is stabilized, Pin 1 connects to the V
pin and provides bias to the PFC controller. It goes down in standby and fault
conditions.
An optocoupler collector pulls this pin low to regulate. When the current setpoint
falls below 25% of the maximum peak, the controller skips cycles.
This pin incorporates two different functions: the standard sense function and an
internal ramp compensation signal.
With a drive capability of +500 mA / ï800 mA, the NCP1231 can drive large Qg
MOSFETs.
The controller accepts voltages up to 18 V and features a UVLO of 7.7 V typical.
By connecting this pin to a resistive divider, the controller ensures operation at a
safe mains level. If an external event brings this pin above 4 V, the controller is
permanently latchedïoff.
8
7
6
5
http://onsemi.com
SS
NCP1231
2
OVP
Pin Description
CC
ï
pin (Pin 6) via a low impedance switch.
GND
+
GND
V
CC
CC
out