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NCP1337 Folha de dados(PDF) 2 Page - ON Semiconductor |
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NCP1337 Folha de dados(HTML) 2 Page - ON Semiconductor |
2 / 14 page 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 |
Nº de peça semelhante - NCP1337 |
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Descrição semelhante - NCP1337 |
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