VIPER28

Manufacturer Part NumberVIPER28
DescriptionVIPerPlus family: fixed frequency high performance off line high voltage converter
ManufacturerSTMicroelectronics
VIPER28 datasheet
 


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Features
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 V
Limiting current with adjustable set point
Adjustable and accurate over-voltage
protection
On-board soft-start
Safe auto-restart after a fault condition
Hysteretic thermal shutdown
Delayed overload protection
Application
Auxiliary power supply for consumer and home
equipment
ATX auxiliary power supply
Low / medium power AC-DC adapters
SMPS for set-top boxes, DVD players and
recorders, white goods
Table 1.
Device summary
Order codes
VIPER28LN / VIPER28HN
VIPER28LE / VIPER28HE
VIPER28HD / VIPER28LD
VIPER28HDTR / VIPER28LDTR
August 2010
Off-line high voltage converters
SDIP10
Description
AC
The device is an off-line converter with an 800 V
rugged power section, a PWM control, two levels
of over-current protection, over-voltage and
overload protections, hysteretic thermal
protection, 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 regulations. Advance
frequency jittering reduces EMI filter cost. The
extra power timer allows the management of
output peak power for a designed time window.
The high voltage start-up circuit is embedded in
the device.
Figure 1.
+
DC input high voltage
wide range
-
DRAIN DRAIN
VIPER28
VDD
GND
CONT
Package
DIP-7
SDIP10
SO16 narrow
Doc ID 15028 Rev 4
VIPER28
SO16 narrow
DIP-7
SO 16
Typical topology
DC Output voltage
EPT
FB
Packaging
Tube
Tape and reel
www.st.com
+
-
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VIPER28 Summary of contents

  • Page 1

    ... SMPS for set-top boxes, DVD players and recorders, white goods Table 1. Device summary Order codes VIPER28LN / VIPER28HN VIPER28LE / VIPER28HE VIPER28HD / VIPER28LD VIPER28HDTR / VIPER28LDTR August 2010 Off-line high voltage converters SDIP10 Description AC The device is an off-line converter with an 800 V rugged power section, a PWM control, two levels ...

  • Page 2

    ... Overvoltage protection (OVP 7.9 About CONT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7.10 Feed-back and overload protection (OLP 7.11 Burst-mode operation at no load or very light load . . . . . . . . . . . . . . . . . . 23 7.12 Extra power management function (EPT 7.13 2nd level overcurrent protection and hiccup mode . . . . . . . . . . . . . . . . . . 25 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 2/32 Doc ID 15028 Rev 4 VIPER28 ...

  • Page 3

    ... Typical power Table 2. Typical power Part number Adapter VIPER28 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. VDD Internal Supply bus Internal Supply bus & ...

  • Page 4

    ... High 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 dissipation. Doc ID 15028 Rev 4 Function threshold (see OVP activates the FBbm means that we are FBlin VIPER28 Table 8 ...

  • Page 5

    ... VIPER28 4 Electrical data 4.1 Maximum ratings Table 4. Absolute maximum ratings Symbol V Drain-to-source (ground) voltage DRAIN Repetitive avalanche energy E AV (limited by T Repetitive avalanche current I AR (limited Pulse drain current (limited by T DRAIN V Control input pin voltage (with I CONT V Feed-back voltage ...

  • Page 6

    ... J = GND 125 ° Min Typ GND, V EPT GND, V EPT FB -0.4 -0.6 8.5 23 GND, V EPT FB 7 GND, V EPT FB 4 4.5 = EPT = 60 kHz SW = 115 kHz VIPER28 V μA 60 Ω 7 Ω Max Unit 100 -0 0.9 mA 2.5 mA 3.5 mA 400 uA 270 uA ...

  • Page 7

    ... FB 3.3 V < V < 4 < 3 -100 µA CONT -10 µA FB CONT ° 0 operating voltage DD range VIPER28 L VIPER28 H Doc ID 15028 Rev 4 Electrical data Min Typ Max Unit 4.5 4.8 5.2 V 3.2 3.5 3.7 V 0.6 V 100 mV -150 -200 -280 kΩ ...

  • Page 8

    ... EPT(RESTART) I Sourced EPT current EPT Thermal shutdown T Thermal shutdown temperature SD T Thermal shutdown hysteresis HYST 8/32 Test condition < -10 μA I CONT °C J < -10 μA I CONT Doc ID 15028 Rev 4 VIPER28 Min Typ Max Unit 1.2 A 2.7 3 3.3 V 2.2 us 85% A IDlim 4 V 0.6 V μA 5 150 160 ° ...

  • Page 9

    ... VIPER28 Figure 4. Minimum turn-on time test circuit 14 V Figure 5. OVP threshold test circuits 14 V Note: Adjust V above V DD GND DRAIN VDD DRAIN 50 Ω CONT FB EPT 3.5 V GND DRAIN VDD DRAIN CONT FB EPT 2 V start-up threshold before setting DDon Doc ID 15028 Rev 4 ...

  • Page 10

    ... Typical electrical characteristics 5 Typical electrical characteristics Figure 6. Current limit vs T Figure 8. Drain start-up voltage vs T Figure 10. Operating supply current (no switching 10/32 Figure 7. J Figure 9. J Figure 11. Operating supply current J Doc ID 15028 Rev 4 VIPER28 Switching frequency HFB (switching ...

  • Page 11

    ... VIPER28 Figure 12. Current limit vs R Figure 14. Power MOSFET break down voltage Figure 13. Power MOSFET on-resistance vs T LIM Doc ID 15028 Rev 4 Typical electrical characteristics J 11/32 ...

  • Page 12

    ... Typical electrical characteristics Figure 15. Thermal shutdown DDon V DDoff V DD(RESTART) I DRAIN HYST SD Normal operation 12/32 Shut down after over temperature Doc ID 15028 Rev 4 VIPER28 time time time Normal operation ...

  • Page 13

    ... VIPER28 6 Typical circuit Figure 16. Min-features flyback application Figure 17. Full-feature flyback application EPT EPT Doc ID 15028 Rev 4 Typical circuit 13/32 ...

  • Page 14

    ... V min. and a typical R VDSS DRAIN_START current (3 mA typical value) is delivered to the DDch pin. In case of auto restart mode after a fault event, the I DD Doc ID 15028 Rev 4 VIPER28 of 7 Ω DS(on) threshold typically. When DC current is DDch ...

  • Page 15

    ... VIPER28 7.3 Power-up and soft-start up If the input voltage rises up till the device start threshold, V begins to grow due to the I high voltage start up circuit. If the V page 6) the power MOSFET starts switching and the HV current generator is turned OFF. See Figure 23 on page The IC is powered by the energy stored in the capacitor on the VDD pin, C the self-supply circuit (typically an auxiliary winding of the transformer and a steering diode) develops a voltage high enough to sustain the operation ...

  • Page 16

    ... DDch Figure 20. Soft-start: timing diagram 16/32 Normal operation Power-on I DRAIN t (soft start Dlim FBolp V FBlin V OUT Regulated value Doc ID 15028 Rev 4 V < DRAIN_START HV startup is no more activated regulation is lost here Power-off t T OLP-delay t t VIPER28 time time time time ...

  • Page 17

    ... VIPER28 7.4 Power down operation At converter power down, the system loses regulation as soon as the input voltage is so low that the peak current limitation is reached. The V the V threshold (see DDoff energy transfers to the IC interrupted and consequently the V Figure 23 on page the start up sequence is inhibited and the power down completed. This feature is useful to prevent converter’ ...

  • Page 18

    ... R LIM Table 8 on page 7). 7.8 Overvoltage protection (OVP) The VIPER28 has integrated the logic for the monitor of the output voltage using as input signal the voltage V the voltage from the auxiliary winding tracks the output voltage, through the turn ratio N AUX -------------- ...

  • Page 19

    ... VIPER28 Where: ● the OVP threshold (see OVP ● the converter output voltage value to activate the OVP set by designer OUT OVP ● the auxiliary winding turns AUX ● the secondary winding turns SEC ● the secondary diode forward voltage DSEC ● ...

  • Page 20

    ... Doc ID 15028 Rev 4 27, lists the external components needed to OCP - BLOCK + From R SENSE (1) R OVP No See Equation 4 See Equation 4 Figure 28 on page 22 , (see Table 8 on page V FBlin value. Dlim VIPER28 OCP to GATE driver D AUX No Yes Yes and 7) the drain by Dlim ...

  • Page 21

    ... VIPER28 When the feedback pin voltage reaches the threshold V starts to charge the feedback capacitor (C threshold, the converter is turned off and the start up phase is activated with reduced V FBolp value 0.6 mA, see DDch During the first start up phase of the converter, after the soft-start up time, t voltage could force the feedback pin voltage to rise up to the off the converter itself ...

  • Page 22

    ... Using the alternative compensation network, the designer can FB PWM CONTROL Cfb BURST-MODE REFERENCES 4.8V PWM CONTROL Rfb1 Cfb Cfb1 BURST-MODE REFERENCES Doc ID 15028 Rev 4 VIPER28 ⋅ DYN ) results much higher than C FB1 has to be FB1 From sense FET ...

  • Page 23

    ... VIPER28 7.11 Burst-mode operation at no load or very light load When the load decrease the feedback loop reacts lowering the feedback pin voltage falls down the burst mode threshold, V switched on. After the MOSFET stops result of the feedback reaction to the energy delivery stop, the feedback pin voltage increases and exceeding the level the power MOSFET starts switching again ...

  • Page 24

    ... V), the converter is shut down. voltage will drop below the the VDD pin voltage have to fall below the V discharge current in combination with its low restart threshold, EPT Doc ID 15028 Rev 4 VIPER28 Table that is charged or EPT ), the current generator charges C ‘s voltage EPT ...

  • Page 25

    ... The is protected against short-circuit of the secondary rectifier, short-circuit on the VIPER28 secondary winding or a hard-saturation of fly-back transformer. Such as anomalous condition is invoked when the drain current exceed the threshold I page distinguish a real malfunction from a disturbance (e.g. induced during ESD tests) a “ ...

  • Page 26

    ... Datum plane “H” coincident with the bottom of lead, where lead exits body. 5- Ref. POA MOTHER doc. 0037880 6- Creepage distance > 800 V 7- Creepage distance 250 V 8- Creepage distance as shown in the 664-1 CEI / IEC standard. 26/32 mm Typ Min 0,38 3,30 2,92 0,46 0,36 1,52 1,14 0,25 0,20 9,27 9,02 7,87 7,62 6,35 6,10 2,54 7,62 3,30 2,92 2,508 0,50 0,40 0,548 Doc ID 15028 Rev 4 VIPER28 ® Max 5,33 4,95 0,56 1,78 0,36 10,16 8,26 7,11 10,92 3,81 0,60 0,60 ...

  • Page 27

    ... VIPER28 Figure 28. Package dimensions Doc ID 15028 Rev 4 Package mechanical data 27/32 ...

  • Page 28

    ... Package mechanical data Table 11. SO16 narrow mechanical data Dim ccc 28/32 mm Min. Typ. 0.1 1.25 0.31 0.17 9.8 9.9 5.8 6 3.8 3.9 1.27 0.25 0.4 0 Doc ID 15028 Rev 4 VIPER28 Max. 1.75 0.25 0.51 0.25 10 6.2 4 0.5 1.27 8 0.1 ...

  • Page 29

    ... VIPER28 Figure 29. SO16 narrow mechanical data Doc ID 15028 Rev 4 Package mechanical data 29/32 ...

  • Page 30

    ... Package mechanical data Table 12. SDIP10 mechanical data Dim Figure 30. SDIP10 mechanical drawing 30/32 mm Min. Typ. 0.38 2.92 0.36 0.51 0.2 9.02 7.62 6.1 7.62 1.77 2.92 Doc ID 15028 Rev 4 VIPER28 Max. 5.33 4.95 0.56 1.15 0.36 10.16 8.26 7.11 10.92 3.81 ...

  • Page 31

    ... VIPER28 9 Revision history Table 13. Document revision history Date 30-Sep-2008 22-Jan-2009 21-Oct-2009 31-Aug-2010 Revision 1 Initial release 2 Updated Figure 3 on page 4 3 Added SO16N and SDIP10 packages Updated Figure 3, Figure 4 page 4 Doc ID 15028 Rev 4 Revision history Changes 4, Figure 5 on page 9 and Table 3 on ...

  • Page 32

    ... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 32/32 Please Read Carefully: © 2010 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 15028 Rev 4 VIPER28 ...