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NCP1231 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NCP1231
Description  Low−Standby Power High Performance PWM Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1231 Datasheet(HTML) 2 Page - ON Semiconductor

 
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NCP1231
http://onsemi.com
2
Figure 1. Typical Application Example
BO/OVP
HV
+
to PFC’s VCC
OVP
1
8
2
3
4
7
6
5
NCP1231
+
GND
Vout
GND
Ramp
SS
PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
Function
Pin Description
1
PFC VCC
Directly powers the PFC
front−end stage
This pin is a direct connection to the VCC pin (Pin 6) via a low impedance switch.
In standby and during the startup sequence, the switch is open and the PFC VCC
is shutdown. 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
falls below 25% of the maximum peak, the controller skips cycles.
3
CS
Current Sense
This pin incorporates two different functions: the standard sense function and an
internal ramp compensation signal.
4
GND
IC Ground
5
DRV
Driver Output
With a drive capability of +500 mA / −800 mA, the NCP1231 can drive large Qg
MOSFETs.
6
VCC
VCC Input
The controller accepts voltages up to 18 V and features a UVLO of 7.7 V typical.
7
SS
(Soft−Start)
To provide an internal
ramp timing for different
usages
This pin provides three different functions, via a capacitor to ground, saw tooth
signal whose function is to create a soft−start, frequency dithering and 100 msec
fault timer.
8
BO/OVP
Brown−Out and OVP
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 latched−off.


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