Datasheet

NCP1216, NCP1216A
http://onsemi.com
2
Universal Input
Fosc = 35kHz
HV
Vcc
Drv
GND
Adj
FB
CS
NCP1216
EMI
Filter
1
2
3
45
6
7
8
R
sense
R
comp
+
+
+
*See Application Section
Figure 1. Typical Application Example
PIN FUNCTION DESCRIPTION
Pin No. Pin Name Function Pin Description
1 Adj Adjust the Skipping Peak Current This pin lets you adjust the level at which the cycle skipping process
takes place. Shorting this pin to ground, permanently disables the skip
cycle feature.
2 FB Sets the Peak Current Setpoint By connecting an Optocoupler to this pin, the peak current setpoint is
adjusted accordingly to the output power demand.
3 CS Current Sense Input This pin senses the primary current and routes it to the internal com-
parator via an L.E.B. By inserting a resistor in series with the pin, you
control the amount of ramp compensation you need.
4 GND IC Ground −
5 Drv Driving Pulses The driver’s output to an external MOSFET.
6 V
CC
Supplies the IC
This pin is connected to an external bulk capacitor of typically 22 mF.
7 NC − This un−connected pin ensures adequate creepage distance.
8 HV Generates the V
CC
from the Line Connected to the high−voltage rail, this pin injects a constant current
into the V
CC
bulk capacitor.