NCP1217, NCP1217A
+
See Application
Section
Aux.
+
V OUT
NCP1217
EMI
FILTER
1
2
3
4
Adj HV
FB
CS V CC
Gnd Drv
8
7
6
5
UNIVERSAL
INPUT
Ramp Adjustment
+
Figure 1. Typical Application Example
PIN FUNCTION DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
Pin Name
Adj
FB
CS
GND
Drv
V CC
NC
HV
Function
Adjust the skipping peak current
Sets the peak current setpoint
Current sense input
The IC ground
Driving pulses
Supplies the IC
--
Ensures a clean and lossless
startup sequence
Description
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.
By bringing this pin above 3.1 V, you permanently shut off the device.
By connecting an optocoupler to this pin, the peak current setpoint is ad-
justed accordingly to the output power demand.
This pin senses the primary current and routes it to the internal comparat-
or via an L.E.B. By inserting a resistor in series with the pin, you control
the amount of ramp compensation you need.
--
The driver ’s output to an external MOSFET.
This pin is connected to an external bulk capacitor of typically 22 m F.
This unconnected pin ensures adequate creepage distance.
Connected to the high--voltage rail, this pin injects a constant current into
the V CC capacitor during the startup sequence.
http://onsemi.com
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