VIPER25HDTR

Manufacturer Part NumberVIPER25HDTR
DescriptionIC OFFLINE CONV PWM OVP 16SOIC
ManufacturerSTMicroelectronics
SeriesVIPer™ plus
VIPER25HDTR datasheet
 


Specifications of VIPER25HDTR

Output IsolationIsolatedFrequency Range200 ~ 250kHz
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 names497-10066-2  
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Features
800 V avalanche rugged power section
Quasi-resonant (QR) control for valley
switching operation
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
Applications
Adapters for PDA, camcorders, shavers,
cellular phones, cordless phones, videogames
Auxiliary power supply for LCD/PDP TV,
monitors, audio systems, computer, industrial
systems, LED driver, No el-cap LED driver,
utility power meter
SMPS for set-top boxes, DVD players and
recorders, white goods
Table 1.
Device summary
Order codes
VIPER25LN / VIPER25HN
VIPER25HD / VIPER25LD
VIPER25HDTR / VIPER25LDTR
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, double
levels of overcurrent 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 helps to meet
the standby energy saving regulations. The quasi-
resonant feature reduces EMI filter cost. Brown-
out and brown-in 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
Package
DIP-7
SO16 narrow
Doc ID 15585 Rev 4
VIPER25
DIP-7
Packaging
Tube
Tube
Tape and reel
1/40
www.st.com
40

VIPER25HDTR Summary of contents

  • Page 1

    ... SMPS for set-top boxes, DVD players and recorders, white goods Table 1. Device summary Order codes VIPER25LN / VIPER25HN VIPER25HD / VIPER25LD VIPER25HDTR / VIPER25LDTR 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, double ...

  • Page 2

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

  • Page 3

    VIPER25 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • Page 4

    Block diagram 1 Block diagram Figure 2. Block diagram 2 Typical power Table 2. Typical power Part number VIPER25 1. Typical continuous power in non ventilated enclosed adapter measured at 50 °C ambient. 2. Maximum practical continuous power in an ...

  • Page 5

    VIPER25 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. Name DIP-7 SO16 1 1...2 GND - 4 N.A. ...

  • Page 6

    Electrical data 4 Electrical data 4.1 Maximum ratings Table 4. Absolute maximum ratings Pin Symbol (DIP7 DRAIN DRAIN V 3 ZCD ...

  • Page 7

    VIPER25 4.3 Electrical characteristics (T = -25 to 125 ° Table 6. Power section Symbol V Break-down voltage BVDSS I OFF state drain current OFF Drain-source on state R DS(on) resistance Effective (energy related) C OSS output capacitance ...

  • Page 8

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

  • Page 9

    VIPER25 Table 8. Controller section (continued) Symbol Oscillator section Internal frequency limit F OSClim Internal frequency limit F Starter frequency STARTER F OSCmin Brown-out protection V Brown-out threshold BRth Voltage hysteresis above V BRhyst V BRth I Current hysteresis BRhyst ...

  • Page 10

    Electrical data Figure 4. Minimum turn-on time test circuit 14 V Figure 5. Brown-out threshold test circuits 14 V Figure 6. OVP threshold test circuits 14 V Note: Adjust V above V DD 10/40 GND DRAIN VDD DRAIN 50 Ω ...

  • Page 11

    VIPER25 5 Typical electrical characteristics Figure 7. Current limit vs T Figure 9. HFB vs T Figure 11. Brown-out hysteresis vs T Figure 8. J Figure 10. Brown-out threshold Figure 12. Brown-out hysteresis current J Doc ID ...

  • Page 12

    Typical electrical characteristics Figure 13. Operating supply current (no switching Figure 15. V ZCD V (mV) ZCD 500 450 400 350 300 0.0 50.0 Figure 17. Power MOSFET on-resistance vs T 12/40 Figure 14. Operating supply current J ...

  • Page 13

    VIPER25 Figure 19. Thermal shutdown DDon V DDoff V DD(RESTART) I DRAIN HYST SD Normal operation Typical electrical characteristics Shut down after over temperature Doc ID 15585 Rev 4 time ...

  • Page 14

    Typical circuits 6 Typical circuits Figure 20. Min-features QR flyback application Figure 21. Full-features QR flyback application 14/40 Doc ID 15585 Rev 4 VIPER25 ...

  • Page 15

    VIPER25 7 Operation description VIPER25 is a high-performance low-voltage PWM controller IC with an 800 V, avalanche rugged power section. The controller includes the current-mode PWM logic and the ZCD (zero current detect) circuit for QR operation, the start-up circuitry ...

  • Page 16

    Operation description 7.3 Power-up description If the input voltage rises up till the device start level, V grow due to the I DDch start-up circuit. If the V power MOSFET starts switching and the HV current generator is turned OFF, ...

  • Page 17

    VIPER25 As soon as the output voltage reaches the regulated value, the regulation loop takes over and the drain current is regulated below its limit value lower than the threshold V Figure 22. I current during start-up ...

  • Page 18

    Operation description Figure 24. Timing diagram: Start-up phase and soft start (case DRAIN t I Dlim FBolp V FBlin V OUT Regulated value Figure 25. Timing diagram: Start-up phase and soft start (case ...

  • Page 19

    VIPER25 7.4 Power-down description 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 the power MOSFET is switched OFF, the energy ...

  • Page 20

    Operation description 7.6 Quasi-resonant operation The control core of the VIPER25 is a current-mode PWM controller with a the zero current detection circuit designed for Quasi-Resonant (QR) operation, a technique that provides the benefits of minimum turn-on losses, low EMI ...

  • Page 21

    VIPER25 Figure 27. Switching frequency vs output load Figure 28. Zero current detection circuit and oscillator circuit Doc ID 15585 Rev 4 Operation description 21/40 ...

  • Page 22

    Operation description 7.7 Frequency foldback function and valley skipping mode The switching frequency, in Quasi Resonant mode, is not fixed and it depends on both the load and the converter’s input voltage. The switching frequency increases when the load decreases, ...

  • Page 23

    VIPER25 7.8 Double blanking time The blanking time, T value) and the higher one is 6,3 μs (typical value). The value is linked to the voltage V sampled during the time T relevant Section 7.11 on page 26 < 1V ...

  • Page 24

    Operation description 7.9 Starter If the amplitude of the voltage on ZCD pin at the end of one oscillator cycle is smaller than the V arming threshold, in which case MOSFET's turn-ON could not be triggered, the ZCDAth system would ...

  • Page 25

    VIPER25 Figure 31. Typical power capability vs input voltage in quasi-resonant converter’s In order to proper select the value of the resistance R are known the proper I voltage. The following approximated formula calculates the value of the resistor R ...

  • Page 26

    Operation description Figure 32. ZCD pin typical external configuration 7.11 Overvoltage protection (OVP) The VIPER25 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 ...

  • Page 27

    VIPER25 Equation 6 Where: ● the OVP threshold (see OVP ● the converter output voltage value to activate the OVP (set by designer) OUT OVP designer ● the auxiliary winding turns AUX ● N ...

  • Page 28

    Operation description 7.12 Summary on ZCD pin Referring to the Figure 32 on page 26 implement the following functions: 1. Current limit Line feed-forward compensation 3. Output overvoltage protection (OVP) 4. Zero current detection for QR operation Chosen ...

  • Page 29

    VIPER25 The time, from the high load detection, V depends from the value of the capacitor C OLP delay time can be calculating by the formula: Equation 8 The current, I FB, also a part of the compensation loop , ...

  • Page 30

    Operation description Equation 11 The R is the dynamic resistance seen by the FB pin and reported on FB(DYN) page 8. The C capacitor fixes the OLP delay and usually C FB1 Equation 8 on page 29 considered instead of ...

  • Page 31

    VIPER25 Figure 36. Timing diagram: Overload protection I OUT V OUT I DRAIN I Dlim FBolp V FBlin SOFT START OVER LOAD Warning START UP Doc ID 15585 Rev 4 Operation description OVER ...

  • Page 32

    Operation description 7.14 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, ...

  • Page 33

    VIPER25 Figure 38. Brown-out protection: BR external setting and timing diagram VDD V IN_DC BRhyst Fixed the V and the V INon can be established for the calculation of the resistors R Equation ...

  • Page 34

    Operation description enable the brown-out function the BR pin voltage has to be higher than the maximum of V threshold (150 mV, see DIS nd 7.16 2 level over current protection and hiccup mode The is protected against short circuit ...

  • Page 35

    VIPER25 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 at: www.st.com. ...

  • Page 36

    Package mechanical data Figure 40. DIP-7 package dimensions 36/40 Doc ID 15585 Rev 4 VIPER25 ...

  • Page 37

    VIPER25 Table 11. SO16 narrow mechanical data Dim ccc Databook (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 ...

  • Page 38

    Package mechanical data Figure 41. SO16 package dimensions 38/40 Doc ID 15585 Rev 4 VIPER25 ...

  • Page 39

    VIPER25 9 Revision history Table 12. Document revision history Date 17-Apr-2009 09-Jun-2009 26-Aug-2009 21-Jul-2010 Revision 1 Initial release Updated application paragraph in coverpage and 2 page 8 3 Content reworked to improve readability, no technical changes 4 Updated Table 8 ...

  • Page 40

    ... 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. ...