VIPER06 Energy saving high voltage converter for direct feedback Datasheet - production data Applications Replacement of capacitive power supplies Home appliances Power metering LED drivers Description The VIPER06 is an offline converter with an 800 V avalanche rugged power section, a PWM controller, a user-defined overcurrent limit, open-loop failure protection, hysteretic thermal protection, soft startup and safe auto-restart after any fault condition.
Contents VIPER06 Contents 1 Block diagram.................................................................................. 3 2 Typical power .................................................................................. 3 3 Pin settings ...................................................................................... 4 4 Electrical data .................................................................................. 5 4.1 Maximum ratings ................................................
VIPER06 1 Block diagram Block diagram Figure 2: Block diagram 2 Typical power Table 1: Typical power 230 VAC Part number VIPER06 85-265 VAC Adapter (1) Open frame (2) Adapter (1) Open frame (2) 6W 8W 4W 5W Notes: (1)Typical continuous power in non-ventilated enclosed adapter measured at 50 °C ambient. (2)Maximum practical continuous power in an open-frame design at 50 °C ambient, with adequate heat sinking.
Pin settings 3 VIPER06 Pin settings Figure 3: Connection diagram (top view) The copper area for heat dissipation has to be designed under the DRAIN pins. Table 2: Pin description Pin Name SSO10 1 1 GND Connected to the source of the internal power MOSFET and controller ground reference. 2 2 VDD Supply voltage of the control section. This pin provides the charging current of the external capacitor. 3 3 LIM This pin allows setting the drain current limitation.
VIPER06 Electrical data 4 Electrical data 4.1 Maximum ratings Table 3: Absolute maximum ratings Value Symbol Pin (DIP-7) Parameter Unit Min. VDRAIN 7, 8 Drain-to-source (ground) voltage EAV 7, 8 IAR 800 V Repetitive avalanche energy (limited by TJ = 150 °C) 2 mJ 7, 8 Repetitive avalanche current (limited by TJ = 150 °C) 1 A IDRAIN 7, 8 Pulse drain current (limited by TJ = 150 °C) 2.5 A VCOMP 5 Input pin voltage -0.3 3.5 V VFB 4 Input pin voltage -0.3 4.
Electrical data VIPER06 Figure 4: Rthja vs A 6/28 DocID022794 Rev 2
VIPER06 Electrical data 4.3 Electrical characteristics (TJ = -25 to 125 °C, VDD = 14 Va unless otherwise specified). Table 5: Power section Symbol VBVDSS IOFF Parameter Test condition Min. Typ. Max. Unit Breakdown voltage IDRAIN = 1 mA, VCOMP = GND, TJ = 25 °C OFF state drain current VDRAIN = max rating, VCOMP = GND 60 µA IDRAIN = 0.2 A, TJ = 25 °C 32 Ω IDRAIN = 0.
Electrical data VIPER06 Table 7: Controller section Symbol Parameter Test condition Min. Typ. Max. Unit 3.2 3.3 3.4 V Error amplifier VREF_FB IFB_PULL UP GM FB reference voltage Current pull-up -1 µA Transconductance 2 mA/V 0.
VIPER06 5 Typical electrical characteristics Typical electrical characteristics Figure 5: IDlim vs TJ Figure 6: FOSC vs TJ Figure 7: VDRAIN_START vs TJ Figure 8: HCOMP vs TJ Figure 9: GM vs TJ Figure 10: VREF_FB vs TJ DocID022794 Rev 2 9/28
Typical electrical characteristics VIPER06 Figure 12: Operating supply current (no switching) vs TJ Figure 11: ICOMP vs TJ Figure 13: Operating supply current (switching) vs TJ Figure 14: IDlim vs RLIM Figure 15: Power MOSFET on-resistance vs TJ Figure 16: Power MOSFET breakdown voltage vs TJ 10/28 DocID022794 Rev 2
VIPER06 Typical electrical characteristics Figure 17: Thermal shutdown DocID022794 Rev 2 11/28
Typical circuit 6 VIPER06 Typical circuit Figure 18: Flyback converter (non-isolated output) Figure 19: Flyback converter (isolated output) 12/28 DocID022794 Rev 2
VIPER06 Typical circuit Figure 20: Flyback converter (isolated output without optocoupler) Figure 21: Buck converter DocID022794 Rev 2 13/28
Power section 7 VIPER06 Power section The power section is implemented with an N-channel power MOSFET with a breakdown voltage of 800 V min. and a typical RDS(on) of 32 Ω. It includes a SenseFET structure to allow virtually lossless current sensing and the thermal sensor. The gate driver of the power MOSFET is designed to supply a controlled gate current during both turn-ON and turn-OFF in order to minimize common-mode EMI.
VIPER06 9 Oscillator Oscillator The switching frequency is internally fixed at 30 kHz or 60 kHz or 115 kHz (respectively part numbers VIPER06Xx, VIPER06Lx and VIPER06Hx).
FB pin and COMP pin 12 VIPER06 FB pin and COMP pin The device can be used both in non-isolated and isolated topology. In non-isolated topology, the feedback signal from the output voltage is applied directly to the FB pin as the inverting input of the internal error amplifier having the reference voltage, V REF_FB, see Table 7: "Controller section ". The output of the error amplifier sources and sinks the current, ICOMP, respectively to and from the compensation network connected on the COMP pin.
VIPER06 Burst mode Figure 24: COMP pin voltage versus IDRAIN 13 Burst mode When the voltage VCOMP drops below the threshold, VCOMPL, the power MOSFET is kept in the OFF state and the consumption is reduced to the IDD0 current, as reported on Table 6: "Supply section ". In reaction to the loss of energy, the VCOMP voltage increases and as soon as it exceeds the threshold VCOMPL + VCOMPL_HYS, the converter starts switching again with a level of consumption equal to the IDD1 current.
Automatic auto-restart after overload or shortcircuit 14 VIPER06 Automatic auto-restart after overload or short-circuit The overload protection is implemented automatically using the integrated up-down counter. Every cycle, it is incremented or decremented depending upon the current logic detection of the limit condition or not.
VIPER06 15 Open-loop failure protection Open-loop failure protection If the power supply has been designed using flyback topology and the VIPER06 is supplied by an auxiliary winding, as shown in Figure 28: "FB pin connection for non-isolated flyback" and Figure 29: "FB pin connection for isolated flyback", the converter is protected against feedback loop failure or accidental disconnections of the winding.
Layout guidelines and design recommendations VIPER06 Figure 29: FB pin connection for isolated flyback 16 Layout guidelines and design recommendations A proper printed circuit board layout is essential for correct operation of any switch-mode converter and this is true for the VIPer06 as well. Also some trick can be used to make the design rugged versus external influences.
VIPER06 Layout guidelines and design recommendations A small bypass capacitor (a few hundreds pF up to 0.1 µF) to GND might be useful to get a clean bias voltage for the signal part of the IC and protect the IC itself during EFT/ESD tests. A low ESL ceramic capacitor should be used, placed as close as possible to the VDD pin; When using SO16N package it is recommended to connect the pin 4 to GND pin, using a signal track, in order to improve the noise immunity.
Package information 17 VIPER06 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK ® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 17.
VIPER06 Package information Table 8: SSO10 package mechanical data Dim. mm Min. Typ. A Max. 1.75 A1 0.10 A2 1.25 b 0.31 0.51 c 0.17 0.25 D 4.80 4.90 5 E 5.80 6 6.20 E1 3.80 3.90 4 e 0.25 1 h 0.25 0.50 L 0.40 0.
Package information 17.
VIPER06 Package information Table 9: DIP-7 package mechanical data Dim. mm Notes Min. Typ. A Max. 5.33 A1 0.38 A2 2.92 3.30 4.95 b 0.36 0.46 0.56 b2 1.14 1.52 1.78 c 0.20 0.25 0.36 D 9.02 9.27 10.16 E 7.62 7.87 8.26 E1 6.10 6.35 7.11 e 2.54 eA 7.62 eB L 10.92 2.92 3.30 M(1)(2) N 3.81 2.508 0.40 0.50 N1 6-8 0.60 0.60 O(2)(3) 0.548 7-8 Notes: (1) Creepage distance > 800 V. (2) Creepage distance as shown in the 664-1 CEI / IEC standard.
Ordering information 18 VIPER06 Ordering information Table 10: Order codes Order code Package Packing DIP-7 Tube VIPER06XN VIPER06LN VIPER06HN VIPER06XS Tube VIPER06XSTR Tape and reel VIPER06LS VIPER06LSTR 26/28 SSO10 Tube Tape and reel VIPER06HS Tube VIPER06HSTR Tape and reel DocID022794 Rev 2
VIPER06 19 Revision history Revision history Table 11: Document revision history Date Revision 08-Mar-2012 1 Initial release. 2 Modified title in cover page. Updated Section 4: "Electrical data", Section 4.2: "Thermal data" and Section 4.3: "Electrical characteristics". Added Section 16: "Layout guidelines and design recommendations". Minor text changes.
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