ncp1337crttvevb ON Semiconductor, ncp1337crttvevb Datasheet - Page 2

• Manufacturer Part Number: ncp1337crttvevb
• Description: Quasi Resonant Controller Featuring Over Power Compensation
• Manufacturer: ON Semiconductor

PIN FUNCTION DESCRIPTION
Pin No.
1
2
3
4
5
6
8
+
C
Symbol
bulk
GND
DRV
VCC
BO
CS
HV
FB
BO
Brown−out and external
triggering
Sets the peak current
setpoint
Current sense input and
overpower compensation
adjustment
IC ground
Output driver
IC supply
High−voltage pin
Function
1
2
3
4
NCP1337
Figure 1. Typical Application Schematic
8
6
5
Rcomp
http://onsemi.com
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NCP1337
By connecting this pin to the input voltage through a resistor divider, the
controller ensures operation at a safe mains level.
If an external event brings this pin above 3.0 V, the controller’s output is
disabled.
If an external event brings this pin above 5.0 V, the controller is
permanently latched−off.
By connecting an optocoupler or an auxiliary winding to this pin, the peak
current setpoint is adjusted accordingly to the output power demand.
When the requested peak current setpoint is below the internal standby
level, the device enters soft ripple mode.
This pin senses the primary current and routes it to the internal comparator
via an L.E.B.
Inserting a resistor in series with the pin allows to control the overpower
compensation level.
To be connected to an external MOSFET.
Connected to a tank capacitor (and possibly an auxiliary winding).
When V
Connected to the high−voltage rail, this pin injects a constant current into
the V
2
CC
CC
bulk capacitor and ensures a clean lossless startup sequence.
V
CC
reaches 18.6 V, an internal OVP stops the output pulses.
+
Description
V
CC
+
V
OUT