NCP1200 PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies Housed in SOIC8 or PDIP 8 package, the NCP1200 represents a major leap toward ultracompact Switchmode Power Supplies. Due to www.onsemi.com a novel concept, the circuit allows the implementation of a complete offline battery charger or a standby SMPS with few external MARKING components. Furthermore, an integrated output short circuit DIAGRAMS protection lets the designer build an extremely lowcost ACDC wall 8 adapter associated with a simplified feedback scheme. SOIC8 200Dy With an internal structure operating at a fixed 40 kHz, 60 kHz or ALYW D SUFFIX 8 100 kHz, the controller drives low gatecharge switching devices like CASE 751 1 an IGBT or a MOSFET thus requiring a very small operating power. 1 Due to currentmode control, the NCP1200 drastically simplifies the 8 design of reliable and cheap offline converters with extremely low PDIP8 acoustic generation and inherent pulsebypulse control. 1200Pxxx P SUFFIX AWL When the current setpoint falls below a given value, e.g. the output CASE 626 YYWWG power demand diminishes, the IC automatically enters the skip cycle 8 1 1 mode and provides excellent efficiency at light loads. Because this occurs at low peak current, no acoustic noise takes place. xxx = Device Code: 40, 60 or 100 Finally, the IC is self supplied from the DC rail, eliminating the y = Device Code: need of an auxiliary winding. This feature ensures operation in 4 for 40 presence of low output voltage or shorts. 6 for 60 1 for 100 A = Assembly Location Features L = Wafer Lot No Auxiliary Winding Operation Y, YY = Year W, WW = Work Week Internal Output ShortCircuit Protection G, = PbFree Package Extremely Low NoLoad Standby Power CurrentMode with SkipCycle Capability Internal Leading Edge Blanking PIN CONNECTIONS 250 mA Peak Current Source/Sink Capability Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz Adj18 HV Direct Optocoupler Connection FB 2 7 NC Builtin Frequency Jittering for Lower EMI CS 3 6 V CC SPICE Models Available for TRANsient and AC Analysis GND 4 5 Drv Internal Temperature Shutdown These Devices are PbFree, Halogen Free/BFR Free and are RoHS (Top View) Compliant Typical Applications ORDERING INFORMATION ACDC Adapters See detailed ordering and shipping information on page 14 of Offline Battery Chargers this data sheet. Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.) Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: April, 2015 Rev. 19 NCP1200/DNCP1200 * 6.5 V 600 mA C3 + + D2 C2 HV 1 8 10 F Adj 1N5819 470 F/10 V 400 V 2 FB NC 7 3 CS 6 V M1 CC Rf MTD1N60E 4 GND Drv 5 470 EMI Filter + C5 R sense 10 F D8 5 V1 Universal Input *Please refer to the application information section Figure 1. Typical Application PIN FUNCTION DESCRIPTION Pin No. Pin Name Function Description 1 Adj Adjust the Skipping Peak Current This pin lets you adjust the level at which the cycle skipping process takes place. 2 FB Sets the Peak Current Setpoint By connecting an Optocoupler to this pin, the peak current setpoint is adjus- ted accordingly to the output power demand. 3 CS Current Sense Input This pin senses the primary current and routes it to the internal comparator via an L.E.B. 4 GND The IC Ground 5 Drv Driving Pulses The drivers output to an external MOSFET. 6 V Supplies the IC This pin is connected to an external bulk capacitor of typically 10 F. CC 7 NC No Connection This unconnected pin ensures adequate creepage distance. 8 HV Generates the V from the Line Connected to the highvoltage rail, this pin injects a constant current into CC the V bulk capacitor. CC www.onsemi.com 2