NCP1200 - PWM Current-Mode Controller for Low …

1 Semiconductor Components Industries, LLC, 2015 April, 2015 Rev. 191 Publication Order Number: NCP1200 /DNCP1200 PWM Current-ModeController for Low-PowerUniversal Off-Line SuppliesHoused in SOIC 8 or PDIP 8 package, the NCP1200 represents amajor leap toward ultra compact Switchmode Power Supplies. Due toa novel concept, the circuit allows the implementation of a completeoffline battery charger or a standby SMPS with few externalcomponents. Furthermore, an integrated output short circuitprotection lets the designer build an extremely low cost AC DC walladapter associated with a simplified feedback an internal structure operating at a fixed 40 kHz, 60 kHz or100 kHz, the Controller drives low gate charge switching devices likean IGBT or a MOSFET thus requiring a very small operating to current mode control, the NCP1200 drastically simplifies thedesign of reliable and cheap offline converters with extremely lowacoustic generation and inherent pulse by pulse the current setpoint falls below a given value, the outputpower demand diminishes, the IC automatically enters the skip cyclemode and provides excellent efficiency at light loads.

2 Because thisoccurs at low peak current, no acoustic noise takes , the IC is self supplied from the DC rail, eliminating theneed of an auxiliary winding. This feature ensures operation inpresence of low output voltage or No Auxiliary Winding Operation Internal Output Short Circuit Protection Extremely Low No Load Standby Power Current Mode with Skip Cycle Capability Internal Leading Edge Blanking 250 mA Peak Current Source/Sink Capability Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz Direct Optocoupler Connection Built in Frequency Jittering for Lower EMI SPICE Models Available for TRAN sient and AC Analysis Internal Temperature Shutdown These Devices are Pb Free, Halogen Free/BFR Free and are RoHSCompliantTypical Applications AC DC Adapters Offline Battery Chargers Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.)

3 PDIP 8P SUFFIXCASE 6261818 SOIC 8D SUFFIXCASE 75118534(Top View)AdjCSHVPIN CONNECTIONS762 NCFBGNDDrvVCCMARKINGDIAGRAMSSee detailed ordering and shipping information on page 14 ofthis data INFORMATIONxxx= Device Code: 40, 60 or 100y= Device Code:4 for 406 for 601 for 100A= Assembly LocationL= Wafer LotY, YY= YearW, WW = Work WeekG, G= Pb Free Package200 DyALYWG1200 Pxxx V @ 600 mAD21N5819C510 mF+C310 mF400 V+EMIF ilterAdjFBCSGNDC2470 mF/10 VRf470 DrvVCCNCHV12348765 Universal InputM1 MTD1N60ED85 V1+Figure 1. Typical ApplicationRsense**Please refer to the application information section 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 takesplace.

4 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 comparatorvia an 4 GND The IC Ground 5 Drv Driving Pulses The driver s output to an external MOSFET. 6 VCC Supplies the IC This pin is connected to an external bulk capacitor of typically 10 mF.

5 7 NC No Connection This un connected pin ensures adequate creepage distance. 8 HV Generates the VCC from the Line Connected to the high voltage rail, this pin injects a constant current intothe VCC bulk +-+-+250 , 60 or100 kHzClockOverload?Fault DurationSkip CycleComparator1 VQ Flip FlopDCmax = 80% 250 mA20 k60 k8 k29 VResetQSetUVLOHigh and LowInternal RegulatorHV CurrentSourceInternalVCC4321 CurrentSenseFBAdjGroundDrvVCCNCHV8765 Figure 2. Internal Circuit Architecture MAXIMUM RATINGS Rating Symbol Value Units Power Supply Voltage VCC 16 V Thermal Resistance Junction to Air, PDIP 8 versionThermal Resistance Junction to Air.

6 SOIC versionThermal Resistance Junction to Case RqJARqJARqJC 10017857 C/W Maximum Junction TemperatureTypical Temperature Shutdown TJmax 150140 C Storage Temperature Range Tstg 60 to +150 C ESD Capability, HBM Model (All Pins except VCC and HV) kV ESD Capability, Machine Model 200 V Maximum Voltage on Pin 8 (HV), pin 6 (VCC) Grounded 450 V Maximum Voltage on Pin 8 (HV), Pin 6 (VCC) Decoupled to Ground with 10 mF 500 V Minimum Operating Voltage on Pin 8 (HV) 30 VStresses exceeding those listed in the Maximum Ratings table may damage the device.

7 If any of these limits are exceeded, device functionalityshould not be assumed, damage may occur and reliability may be This device series contains ESD protection rated using the following tests:Human Body Model (HBM) 2000 V per JEDEC Standard JESD22, Method Model (MM) 200 V per JEDEC Standard JESD22, Method CHARACTERISTICS (For typical values TJ = +25 C, for min/max values TJ = 25 C to +125 C, Max TJ = 150 C,VCC= 11 V unless otherwise noted)RatingPinSymbolMinTypMaxUnitDYNAMI C SELF SUPPLY (All Frequency Versions, Otherwise Noted)VCC Increasing Level at Which the Current Source Turns Decreasing Level at Which the Current Source Turns Decreasing Level at Which the Latchoff Phase Ends6 VCClatch VInternal IC Consumption, No Output Load on Pin 56 ICC1 710880 Note 1mAInternal IC Consumption, 1 nF Output Load on Pin 5, FSW = 40 kHz6 ICC2 2mAInternal IC Consumption, 1 nF Output Load on Pin 5, FSW = 60 kHz6 ICC2 2mAInternal IC Consumption, 1 nF Output Load on Pin 5, FSW = 100 kHz6 ICC2 2mAInternal IC Consumption, Latchoff Phase6 ICC3 350 mAINTERNAL CURRENT SOURCEHigh voltage Current Source, VCC = 10 mAHigh voltage Current Source, VCC = 0 V8IC2 mADRIVE OUTPUTO utput Voltage Rise time @ CL = 1 nF, 10 90% of Output Signal5Tr 67 nsOutput Voltage Fall time @ CL = 1 nF.

8 10 90% of Output Signal5Tf 28 nsSource Resistance (drive = 0, Vgate = VCCHMAX 1 V)5 ROH274061 WSink Resistance (drive = 11 V, Vgate = 1 V)5 ROL51225 WCURRENT COMPARATOR (Pin 5 Un loaded)Input Bias Current @ 1 V Input Level on Pin 33 IIB mAMaximum internal Current Internal Current Setpoint for Skip Cycle Operation3 ILskip 350 mVPropagation Delay from Current Detection to Gate OFF State3 TDEL 100160nsLeading Edge Blanking Duration3 TLEB 230 nsINTERNAL OSCILLATOR (VCC = 11 V, Pin 5 Loaded by 1 kW)Oscillation Frequency, 40 kHz Version fOSC364248kHzOscillation Frequency, 60 kHz Version fOSC526170kHzOscillation Frequency, 100 kHz Version fOSC86103116kHzBuilt in Frequency Jittering, FSW = 40 kHz fjitter 300 Hz/VBuilt in Frequency Jittering, FSW = 60 kHz fjitter 450 Hz/VBuilt in Frequency Jittering, FSW = 100 kHz fjitter 620 Hz/VMaximum Duty Cycle Dmax748087%FEEDBACK SECTION (VCC = 11 V, Pin 5 Loaded by 1 kW)Internal Pullup Resistor2 Rup kWPin 3 to Current Setpoint Division Ratio Iratio SKIP CYCLE GENERATIOND efault skip mode 1 internal output impedance1 Zout 25 kWProduct parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted.

9 Productperformance may not be indicated by the Electrical Characteristics if operated under different Max value @ TJ = 25 Max value @ TJ = 25 C, please see characterization 257550251001250 256075305025 LEAKAGE (mA)0 TEMPERATURE ( C)Figure 3. HV Pin Leakage Current 4. VCC OFF vs. TemperatureVCCOFF (V) 5. VCC ON vs. TemperatureTEMPERATURE ( C)Figure 6. ICC1 vs. TemperatureTEMPERATURE ( C)ICC1 (mA)VCCON (V)Figure 7. ICC2 vs. TemperatureTEMPERATURE ( C)Figure 8. Switching Frequency vs. TJTEMPERATURE ( C)ICC2 (mA)FSW (kHz)650800700600850900100 kHzTEMPERATURE ( C) 25755025100125040 kHz60 kHz100 kHz40 kHz60 kHz100 kHz40 kHz60 kHz 257550251001250100 kHz40 kHz60 kHz5044 257550251001250100 kHz40 kHz60 (V) ( C)Figure 9. VCC Latchoff vs. TemperatureFigure 10. ICC3 vs.

10 TemperatureICC3 (mA)6050403020100 Figure 11. DRV Source/Sink ResistancesTEMPERATURE ( C)Figure 12. Current Sense Limit vs. TemperatureTEMPERATURE ( C)CURRENT SETPOINT (V)WFigure 13. Vskip vs. TemperatureTEMPERATURE ( C)Figure 14. Max Duty Cycle vs. TemperatureTEMPERATURE ( C)Vskip (V)DUTY MAX (%) 25125 SourceTEMPERATURE ( C) 251255075250100 251255075250100 251252802502205075250100 INFORMATIONINTRODUCTIONThe NCP1200 implements a standard current modearchitecture where the switch off time is dictated by thepeak current setpoint. This component represents the idealcandidate where low part count is the key parameter,particularly in low cost AC DC adapters, auxiliarysupplies etc. Due to its high performance High Voltagetechnology, the NCP1200 incorporates all the necessarycomponents normally needed in UC384X based supplies:timing components, feedback devices, low pass filter andself supply.