Off-line high voltage converters - st.com

1 July 2010 Doc ID 15133 Rev 51/3131 VIPER27 Off-line high voltage convertersFeatures 800 V avalanche rugged power section PWM operation with frequency jittering for low EMI Operating frequency: 60 kHz for L type 115 kHz for H type Standby power < 50 mW at 265 Vac Limiting current with adjustable set point Adjustable and accurate overvoltage protection On-board soft-start Safe auto-restart after a fault condition Hysteretic thermal shutdown Application Auxiliary power supply for consumer and home equipments ATX auxiliary power supply Low / medium power AC-DC adapters SMPS for set-top boxes, DVD players and recorders, white goodsDescriptionThe device is an Off-line converter with an 800 V rugged power section, a PWM control, two levels of over-current protection, overvoltage and overload protections, hysteretic thermal protection.

2 Soft-start and safe auto-restart after any fault condition removal. Burst mode operation and device very low consumption help to meet the standby energy saving frequency jittering reduces EMI filter cost. Brown-out function protects the switch mode power supply when the rectified input voltage level is below the normal minimum level specified for the system. The high voltage start-up circuit is embedded in the topology DIP-7SO16SO16 narrowDC input high voltage wide range-+DC Output voltage -+VIPER27 DRAINDRAINBRVDDCONTFBGNDT able summaryOrder codesPackagePackaging VIPER27LN / VIPER27 HNDIP-7Tu b eVIPER27HD / VIPER27 LDSO16 narrowVIPER27 HDTR / VIPER27 LDTRTape and ContentsVIPER272/31 Doc ID 15133 Rev 5 Contents1 Block diagram.

3 32 Typical power .. 33 Pin settings .. 44 Electrical data .. ratings .. data .. characteristics .. 65 Typical electrical characteristics .. 106 Typical circuit .. 137 Operation descriptions .. section and gate driver .. voltage startup generator .. and soft-start up .. down operation .. restart operation .. mode conversion with adjustable current limit set point .. protection (OVP) .. CONT pin .. and overload protection (OLP) .. operation at no load or very light load .. protection .. level over current protection and hiccup mode .. 258 Package mechanical data .. 269 Revision history .. 30 VIPER27 Block diagramDoc ID 15133 Rev 53/31 1 Block diagram2 Typical power Figure diagram VDD TH ER MALSHUTDOWN6uALEB&OVPLOGICSOFTSTARTOCPBL OCKRefTU R N -ONLOGICDRAINSUPPLY& UVLOOTPOLPBURSTI nternal Supply busBRBURST-MODELOGICBURSTSR1R2Q+-UVLOVin _OK+-OCPRef erence +-RsenseCONT+-PWM2nd OCPLOGICVDDT able powerPart number230 VAC85-265 VACA dapter(1)Open frame(2)Adapter(1)Open frame(2)VIPER2718 W20 W10 W12 W 1.

4 Typical continuous power in non ventilated enclosed adapter measured at 50 C Maximum practical continuous power in an open frame design at 50 C ambient, with adequate heat sinking. Pin settingsVIPER274/31 Doc ID 15133 Rev 53 Pin settingsFigure diagram (top view)Note:The copper area for heat dissipation has to be designed under the DRAIN descriptionPin pin represents the device ground and the source of the power section. available for user. It can be connected to GND (pins 1-2) or left not connected. 25 VDDS upply voltage of the control section. This pin also provides the charging current of the external capacitor during start-up time. 36 CONTC ontrol pin.

5 The following functions can be selected:1. current limit set point adjustment. The internal set default value of the cycle-by-cycle current limit can be reduced by connecting to ground an external output voltage monitoring. A voltage exceeding VOVP threshold (see Table 8 on page 7) shuts the IC down reducing the device consumption. This function is strobed and digitally filtered for high noise input for duty cycle control. Internal current generator provides bias current for loop regulation. A voltage below the threshold VFBbm activates the burst-mode operation. A level close to the threshold VFBlin means that we are approaching the cycle-by-cycle over-current set point. 58 BRBrownout protection input with hysteresis.

6 A voltage below the threshold VBRth shuts down (not latch) the device and lowers the power consumption. Device operation restarts as the voltage exceeds the threshold VBRth + VBRhyst. It can be connected to ground when not , DRAINHigh voltage drain pin. The built-in high voltage switched start-up bias current is drawn from this pin too. Pins connected to the metal frame to facilitate heat dataDoc ID 15133 Rev 55/31 4 Electrical Maximum Thermal data Table maximum ratingsSymbolParameterValueUnitMinMaxVDR AIND rain-to-source (ground) voltage 800 VEAVR epetitive avalanche energy (limited by TJ = 150 C)5mJIARR epetitive avalanche current (limited by TJ = 150 C) drain current (limited by TJ = 150 C)3 AVCONTC ontrol input pin voltage (with ICONT = 1 mA) limitedVVFBFeed-back input pin voltage (with IBR = mA) limitedVVDDS upply voltage (IDD = 25 mA) limitedVIDDI nput current 25mAPTOTP ower dissipation at TA < 40 C (DIP-7)

7 1 WPower dissipation at TA < 60 C (SO16N) junction temperature range-40 150 CTSTGS torage temperature-55 150 CTable dataSymbolParameterMax valueUnitSO16 NDIP7 RthJPThermal resistance junction pin(Dissipated power = 1 W)2535 C/WRthJAThermal resistance junction ambient(Dissipated power = 1 W)60100 C/WRthJAThermal resistance junction ambient (1)(Dissipated power = 1 W)1. When mounted on a standard single side FR4 board with 100 mm2 ( sq in) of Cu (35 m thick)50 80 C/W Electrical dataVIPER276/31 Doc ID 15133 Rev Electrical characteristics (TJ = -25 to 125 C, VDD = 14 V(a); unless otherwise specified) a. Adjust VDD above VDDon start-up threshold before settings to 14 section SymbolParameterTest conditionMin Typ Max UnitVBVDSSB reak-down voltageIDRAIN = 1 mA, VFB = GNDTJ = 25 C800 VIOFFOFF state drain currentVDRAIN = max rating, VFB = GND60 ARDS(on)Drain-source on state resistance IDRAIN = A, VFB = 3 V, VBR = GND, TJ = 25 C7 IDRAIN = A, VFB = 3 V, VBR = GND, TJ = 125 C14 COSSE ffective (energy related)

8 Output capacitanceVDRAIN = 0 to 640 V40pFTable section SymbolParameterTest conditionMin Typ Max UnitVo l t ag eVDRAIN_STARTD rain-source start voltage6080100 VIDDchStart up charging currentVDRAIN = 120 V, VBR = GND, VFB = GND, VDD = 4 V-2-3-4mAVDRAIN = 120 V, VBR = GND, VFB = GND, VDD = 4 V after mAVDDO perating voltage rangeAfter clamp voltageIDD = 20 start up thresholdVDRAIN = 120 V, VBR = GND, VFB = GND131415 VVDDoffVDD under voltage shutdown (RESTART)VDD restart voltage thresholdVDRAIN = 120 V, VBR = GND, VFB = supply current, not switchingVFB = GND, FSW = 0 kHz, VBR = GND, VDD = 10 supply current, switchingVDRAIN = 120 V, FSW = 60 = 120 V, FSW = 115 supply current, with protection tripping400 AIDD_OFFO perating supply current with VDD < VDD_OFFVDD = 7 V 270 AVIPER27 Electrical dataDoc ID 15133 Rev 57/31 Table section SymbolParameterTest conditionMinTyp Max UnitFeed-back pinVFBolpOver load shutdown dynamics upper mode thresholdVoltage mode hysteresisVoltage rising 100mVIFBFeed-back sourced currentVFB = V-150 -200 -280 V < VFB < V-3 ARFB(DYN)

9 Dynamic resistanceVFB < V1421k HFB VFB / ID26V/ACONT pinVCONT_l Low level clamp voltageICONT = -100 limitationIDlimMax drain current limitation VFB = 4 V, ICONT = -10 ATJ = 25 turn ON time 220400480nstdPropagation delay 100nstLEBL eading edge blanking 300nsID_BMPeak drain current during burst modeVFB = V160mAOscillator sectionFOSCVIPER27 LVDD = operating voltage range, VFB = 1 V 546066kHzVIPER27H103115127kHzFDModulatio n depthVIPER27L 4kHzVIPER27H 8kHzFMModulation frequency250 HzDMAXM aximum duty cycle 7080%Over current protection (2nd OCP)IDMAXS econd over current threshold1 AOvervoltage protectionVOVPO vervoltage protection protection strobe time Electrical dataVIPER278/31 Doc ID 15133 Rev 5 SymbolParameterTest conditionMinTyp Max UnitBrown out protectionVBRthBrown out thresholdVoltage VBRhystVoltage hysteresis above VBRthVoltage rising50mVIBR hystCurrent hysteresis712 AVBR clampClamp voltageIBR = 250 A3 VVDISB rown out disable voltage50150mVThermal shutdownTSDT hermal shutdown temperature150160 CTHYSTT hermal shutdown hysteresis30 CTable section (continued)

10 VIPER27 Electrical dataDoc ID 15133 Rev 59/31 Figure turn-on time test circuitFigure out threshold test circuitFigure threshold test circuit Note:Adjust VDD above VDDon start-up threshold before settings to 14 V14 V50 30 VGNDCONTFBVDDDRAINBRDRAINVDRAINIDRAINIDL IMTimeTimeTONmin90 %10 %GNDCONTFBVDDDRAINBRDRAIN14 V2 V10 k 30 VIBR hystVBRth+VBRhystVBRthVBRIBRVDISIBR hystIDRAINTimeTimeTimeGNDCONTFBVDDDRAINB RDRAINVOVPVCONTVDRAIN14 V2 V10 k 30 VTimeTime Typical electrical characteristicsVIPER2710/31 Doc ID 15133 Rev 55 Typical electrical characteristics Figure limit vs TJ Figure frequency vs TJ Figure start voltage vs TJFigure 10.