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NCP1337 Folha de dados(PDF) 2 Page - ON Semiconductor

Nome de Peças NCP1337
Descrição Electrónicos  PWM Current?묺ode Controller for Free Running Quasi?뭃esonant Operation
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

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NCP1337
http://onsemi.com
2
PIN FUNCTION DESCRIPTION
Pin No.
Symbol
Function
Description
1
BO
Brown−out and external
triggering
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.
2
FB
Sets the peak current
setpoint
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.
3
CS
Current sense input and
overpower compensation
adjustment
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.
4
GND
IC ground
5
DRV
Output driver
To be connected to an external MOSFET.
6
VCC
IC supply
Connected to a tank capacitor (and possibly an auxiliary winding).
When V
CC reaches 18.6 V, an internal OVP stops the output pulses.
8
HV
High−voltage pin
Connected to the high−voltage rail, this pin injects a constant current into
the VCC bulk capacitor and ensures a clean lossless startup sequence.
1
8
2
3
4
6
5
NCP1337
Rcomp
BO
+
Cbulk
+
VCC
VCC
+
VOUT
Figure 1. Typical Application Schematic


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