VIPER27HDTR

Manufacturer Part NumberVIPER27HDTR
DescriptionIC OFFLINE CONV PWM OVP OCP 16SO
ManufacturerSTMicroelectronics
SeriesVIPer™ plus
VIPER27HDTR datasheet
 


Specifications of VIPER27HDTR

Output IsolationIsolatedFrequency Range103 ~ 127kHz
Voltage - Input8.5 ~ 23.5 VVoltage - Output800V
Power (watts)24WOperating Temperature-40°C ~ 150°C
Package / Case16-SOIC (0.154", 3.90mm Width)Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other names497-10068-2  
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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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VIPER27HDTR Summary of contents

  • Page 1

    ... 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 ...

  • Page 2

    Contents Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • Page 3

    VIPER27 1 Block diagram Figure 2. Block diagram BRth 15uA SOFT START CONT . OVP LOGIC 6uA OVP FB 2 Typical power Table 2. Typical power Part number Adapter VIPER27 1. Typical continuous power in non ...

  • Page 4

    Pin settings 3 Pin settings Figure 3. Connection diagram (top view) Note: The copper area for heat dissipation has to be designed under the DRAIN pins. Table 3. Pin description Pin n. DIP7 SO16N 1 1... ...

  • 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 ...

  • Page 6

    Electrical data 4.3 Electrical characteristics (T = -25 to 125 ° Table 6. Power section Symbol Parameter V Break-down voltage BVDSS I OFF state drain current OFF Drain-source on state R DS(on) resistance Effective (energy related) C OSS ...

  • Page 7

    VIPER27 Table 8. Controller section Symbol Parameter Feed-back pin V Over load shutdown threshold FBolp V Linear dynamics upper limit FBlin V Burst mode threshold FBbm V Burst mode hysteresis FBbmhys I Feed-back sourced current FB R Dynamic resistance FB(DYN) ...

  • Page 8

    Electrical data Table 8. Controller section (continued) Symbol Parameter Brown out protection V Brown out threshold BRth V Voltage hysteresis above V BRhyst I Current hysteresis BRhyst V Clamp voltage BRclamp V Brown out disable voltage DIS Thermal shutdown T ...

  • 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 ...

  • 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 vs T ...

  • 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 ...

  • 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 ...

  • Page 13

    VIPER27 6 Typical circuit Figure 20. Min-features flyback application Figure 21. Full-features flyback application Vcc DRAIN CONTROL CONT FB ...

  • Page 14

    Operation descriptions 7 Operation descriptions is a high-performance low-voltage PWM controller chip with an 800 V, avalanche VIPER27 rugged Power section. The controller includes: the oscillator with jittering feature, the start up circuits with soft-start feature, the PWM logic, the ...

  • 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 ...

  • Page 16

    Operation descriptions Figure 23. Timing diagram: normal power-up and power-down sequences DRAIN_START DDon V DDoff V DD(RESTART) V DRAIN (3mA) DDch Figure 24. Soft-start: timing diagram 16/31 Normal operation Power-on I ...

  • 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 ...

  • Page 18

    Operation descriptions 7.7 Current mode conversion with adjustable current limit set point The device is a current mode converter: the drain current is sensed and converted in voltage that is applied to the non inverting pin of the PWM comparator. ...

  • 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 ...

  • Page 20

    Operation descriptions 7.9 About CONT pin Referring to the Figure 27 1. Current limit set point 2. Over voltage protection on the converter output voltage The Table 9 on page 20 activate one or plus of the CONT pin functions. ...

  • 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, ...

  • Page 22

    Operation descriptions Equation 7 Equation 8 The R is the dynamic resistance seen by the FB pin. FB(DYN) The C capacitor fixes the OLP delay and usually C FB1 The Equation 5 can be still used to calculate the OLP ...

  • 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, as ...

  • Page 24

    Operation descriptions Figure 31. Brown-out protection: BR external setting and timing diagram DIS BRth I BRhyst Rl Fixed the V and the V INon can be established for the calculation of the resistors R ...

  • Page 25

    VIPER27 nd 7.13 2 level over current protection and hiccup mode 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 ...

  • Page 26

    Package mechanical data 8 Package mechanical data 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 ...

  • 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 ...

  • Page 29

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

  • Page 30

    Revision history 9 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 ...

  • 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. ...