NCP1203 PWM Controller, Fixed Frequency, Flyback, Current Mode www.onsemi.com Housed in SOIC 8 or PDIP8 package, the NCP1203 represents a major leap toward ultracompact Switchmode Power Supplies and represents an excellent candidate to replace the UC384X devices. Due MARKING to its proprietary SMARTMOS Very High Voltage Technology, the DIAGRAM circuit allows the implementation of complete offline ACDC adapters, battery charger and a highpower SMPS with few external 8 SOIC8 components. 203Dx D1, D2 SUFFIX ALYW 8 With an internal structure operating at a fixed 40 kHz, 60 kHz or CASE 751 100 kHz switching frequency, the controller features a highvoltage 1 1 startup FET which ensures a clean and loss less startup sequence. Its currentmode control naturally provides good audiosusceptibility x = 4, 6, or 1 and inherent pulsebypulse control. A = Assembly Location When the current setpoint falls below a given value, e.g. the L = Wafer Lot output power demand diminishes, the IC automatically enters the so Y = Year W = Work Week called skip cycle mode and provides improved efficiency at light = PbFree Package loads while offering excellent performance in standby conditions. Because this occurs at a user adjustable low peak current, no acoustic noise takes place. 8 The NCP1203 also includes an efficient protective circuitry PDIP8 1203Pxx which, in presence of an output over load condition, disables the N SUFFIX AWL output pulses while the device enters a safe burst mode, trying to CASE 626 YYWWG 8 restart. Once the default has gone, the device auto recovers. 1 1 Finally, a temperature shutdown with hysteresis helps building safe and robust power supplies. xx = 40, 60, or 100 A = Assembly Location Features WL = Wafer Lot YY = Year HighVoltage Startup Current Source WW = Work Week AutoRecovery Internal Output ShortCircuit Protection G = PbFree Package Extremely Low NoLoad Standby Power CurrentMode with Adjustable SkipCycle Capability PIN CONNECTIONS Internal Leading Edge Blanking 250 mA Peak Current Capability Adj HV 1 8 Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz FB 2 7 NC Direct Optocoupler Connection CS 3 6 V Undervoltage Lockout at 7.8 V Typical CC SPICE Models Available for TRANsient and AC Analysis GND 4 5 Drv Pin to Pin Compatible with NCP1200 (Top View) These Devices are PbFree, Halogen Free/BFR Free and are RoHS Compliant ORDERING INFORMATION Applications See detailed ordering and shipping information on page 13 of ACDC Adapters for Notebooks, etc. this data sheet. Offline Battery Chargers Auxiliary Power Supplies (USB, Appliances, TVs, etc.) Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: April, 2015 Rev. 12 NCP1203/DNCP1203 * V OUT + Aux. + NCP1203 Adj HV 1 8 FB 2 7 CS V CC EMI 3 6 GND Drv FILTER 4 5 UNIVERSAL INPUT + *Please refer to the application information section Figure 1. Typical Application Example PIN FUNCTION DESCRIPTION Pin No. Pin Name Function Pin Description 1 Adj Adjust the skipping peak current 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. 2 FB Sets the peak current setpoint By connecting an optocoupler to this pin, the peak current setpoint is adjusted accordingly to the output power demand. Skip cycle occurs when FB falls below Vpin1. 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 22 F. CC 7 NC This unconnected pin ensures adequate creepage distance. 8 HV Ensure a clean and lossless Connected to the highvoltage rail, this pin injects a constant current into startup sequence the V capacitor during the startup sequence. CC www.onsemi.com 2