VIPER27

Manufacturer Part NumberVIPER27
DescriptionVIPerPlus family: fixed frequency high performance off line high voltage converter
ManufacturerSTMicroelectronics
VIPER27 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 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 goods
Table 1.
Device summary
Order codes
VIPER27LN / VIPER27HN
VIPER27HD / VIPER27LD
VIPER27HDTR / VIPER27LDTR
July 2010
Off-line high voltage converters
SO16 narrow
SO 16
Description
The 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, 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. 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 device.
Figure 1.
Typical topology
+
DC input high voltage
wide range
-
DRAIN DRAIN
BR
VIPER27
VDD
FB
GND
CONT
Package
DIP-7
SO16 narrow
Doc ID 15133 Rev 5
VIPER27
DIP-7
+
DC Output voltage
-
Packaging
Tube
Tape and reel
1/31
www.st.com
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VIPER27 Summary of contents

  • Page 1

    ... Low / medium power AC-DC adapters ■ SMPS for set-top boxes, DVD players and recorders, white goods Table 1. Device summary Order codes VIPER27LN / VIPER27HN VIPER27HD / VIPER27LD VIPER27HDTR / VIPER27LDTR July 2010 Off-line high voltage converters SO16 narrow SO 16 Description The device is an off-line converter with an 800 V ...

  • Page 2

    ... Current mode conversion with adjustable current limit set point . . . . . . . 18 7.8 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 Brown-out protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.13 2nd level over current protection and hiccup mode . . . . . . . . . . . . . . . . . 25 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2/31 Doc ID 15133 Rev 5 VIPER27 ...

  • Page 3

    ... LOGIC 6uA OVP FB 2 Typical power Table 2. Typical power Part number Adapter VIPER27 1. Typical continuous power in non ventilated enclosed adapter measured Maximum practical continuous power in an open frame design at 50 VDD VDD Vcc Vin_OK Internal Supply bus SUPPLY & & UVLO ...

  • 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 15133 Rev 5 Function threshold (see OVP . It can be connected to ground when not used. VIPER27 FBbm FBlin ...

  • Page 5

    ... VIPER27 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

    ... Doc ID 15133 Rev 5 Min Typ Max Unit 800 = GND GND Min Typ Max Unit GND GND, FB -0.4 -0.6 -0.8 8.5 23 GND FB 7 GND 4 4 GND, BR VIPER27 V μA 60 Ω 7 Ω 100 23 8 0.9 mA 2.5 mA 3.5 mA μA 400 μA ...

  • Page 7

    ... FB V < 3 -100 µA CONT -10 µA CONT ° 0 operating voltage range VIPER27L VIPER27H Doc ID 15133 Rev 5 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 μA -150 -200 -280 μ kΩ V/A 0 ...

  • Page 8

    ... V Brown out disable voltage DIS Thermal shutdown T Thermal shutdown temperature SD T Thermal shutdown hysteresis HYST 8/31 Test condition Voltage falling Voltage rising BRth I = 250 µA BR Doc ID 15133 Rev 5 VIPER27 Min Typ Max Unit 0.41 0.45 0. μ 150 mV 150 160 °C 30 °C ...

  • Page 9

    ... VIPER27 Figure 4. Minimum turn-on time test circuit 14 V Figure 5. Brown out threshold test circuit 14 V Figure 6. OVP threshold test circuit 14 V Note: Adjust V above V DD GND DRAIN VDD DRAIN 50 Ω CONT FB BR 3.5 V GND DRAIN VDD DRAIN CONT I BRhyst GND ...

  • Page 10

    ... Typical electrical characteristics 5 Typical electrical characteristics Figure 7. Current limit vs T Figure 9. Drain start voltage vs T Figure 11. Brown out threshold vs T 10/31 Figure 8. Switching frequency Figure 10. HFB Figure 12. Brown out hysteresis Doc ID 15133 Rev 5 VIPER27 ...

  • Page 11

    ... VIPER27 Figure 13. Brown out hysteresis current vs T Figure 15. Operating supply current (switching Figure 17. Power MOSFET on-resistance vs T Figure 14. Operating supply current J Figure 16. current limit Figure 18. Power MOSFET break down J Doc ID 15133 Rev 5 Typical electrical characteristics (no switching LIM voltage vs T ...

  • Page 12

    ... Typical electrical characteristics Figure 19. Thermal shutdown DDon V DDoff V DD(RESTART) I DRAIN HYST SD Normal operation 12/31 Shut down after over temperature Doc ID 15133 Rev 5 VIPER27 time time time Normal operation ...

  • Page 13

    ... VIPER27 6 Typical circuit Figure 20. Min-features flyback application Figure 21. Full-features flyback application Vcc DRAIN CONTROL CONT FB SOURCE GND Daux Rov p R2 Vcc CONTROL CONT FB SOURCE Rlim C4 Doc ID 15133 Rev 5 ...

  • 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 15133 Rev 5 VIPER27 of 7 Ω DS(on) threshold typically. When DC current is DDch ...

  • Page 15

    ... VIPER27 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 16 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 24. Soft-start: timing diagram 16/31 Normal operation Power-on I DRAIN I Dlim FBolp V FBlin V OUT t ( SOFT START DELAY (OLP) SS Doc ID 15133 Rev 5 VIPER27 V < DRAIN_START HV startup is no more activated time regulation is lost here time time time Power-off STEADY STATE ...

  • Page 17

    ... VIPER27 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 16 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 VIPER27 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

    ... VIPER27 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

    ... Figure 2 on page 3 . Doc ID 15133 Rev 5 , lists the external components needed to OCP - OCP BLOCK + to GATE driver From R SENSE (1) R OVP No See Equation 4 See Equation 4 Figure 28 on page 22 , (see Table 8 on page 7 V FBlin value. Dlim VIPER27 D AUX No Yes Yes and ) the drain by Dlim ...

  • Page 21

    ... VIPER27 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 15133 Rev 5 VIPER27 ⋅ DYN ) results much higher than C FB1 has to be FB1 From sense FET ...

  • Page 23

    ... VIPER27 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

    ... IN off threshold (50 mV, see DIS Table 8 ). Doc ID 15133 Rev 5 Figure 31 , the following relationships and − BRhyst × BRth V I BRth BRhyst R × BRhyst + BRhyst Table order to VIPER27 ...

  • Page 25

    ... The is protected against short circuit of the secondary rectifier, short circuit on the VIPER27 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

    ... ECOPACK specifications, grade definitions and product status are available at: www.st.com. ® ECOPACK trademark. Table 10. DIP-7 mechanical data Dim 26/31 mm Min. Typ. 0.38 2.92 3.30 0.36 0.46 1.14 1.52 0.20 0.25 9.02 9.27 7.62 7.87 6.10 6.35 2.54 7.62 2.92 3.30 2.508 0.40 0.50 0.548 Doc ID 15133 Rev 5 VIPER27 ® 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

    ... VIPER27 Figure 33. Package dimensions Doc ID 15133 Rev 5 Package mechanical data 27/31 ...

  • Page 28

    ... Package mechanical data Table 11. SO16 narrow mechanical data Dim ccc 28/31 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 15133 Rev 5 VIPER27 Max. 1.75 0.25 0.51 0.25 10 6.2 4 0.5 1.27 8 0.1 ...

  • Page 29

    ... VIPER27 Figure 34. SO16 narrow mechanical data Doc ID 15133 Rev 5 Package mechanical data 29/31 ...

  • Page 30

    ... Revision history Table 12. Document revision history Date 16-Jan-2009 20-Jul-2009 22-Oct-2009 16-Jun-2010 30-Jul-2010 30/31 Revision 1 Initial release 2 Added SO16 narrow package. 3 Updated Table 5 on page 5 Figure 3 on page 4 4 Updated 5 Updated Figure 11 Doc ID 15133 Rev 5 Changes . Table 3 on page 4 and . , Figure 12 and Figure 13 . VIPER27 ...

  • Page 31

    ... VIPER27 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...