Switching Converters, Regulators & Controllers VIPer28 Rugged 800V Fixed freq 115 kHz

VIPER28HE

Manufacturer Part NumberVIPER28HE
DescriptionSwitching Converters, Regulators & Controllers VIPer28 Rugged 800V Fixed freq 115 kHz
ManufacturerSTMicroelectronics
VIPER28HE datasheet
 


Specifications of VIPER28HE

Output Voltage800 VOutput Current3 A
Output Power20 WInput Voltage8.5 V to 23.5 V
Switching Frequency115 KHzOperating Temperature Range- 40 C to + 150 C
Mounting StyleThrough HolePackage / CaseSDIP-10
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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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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VIPER28HE 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 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 ...

  • Page 2

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

  • Page 3

    VIPER28 1 Block diagram Figure 2. Block diagram LEB LEB EPT Tov l Tov l EPT Tovl Tovl BLOCK BLOCK OLP OLP SOFT SOFT START START OCP OCP BLOCK BLOCK CONT CONT OVP DETECTION OVP DETECTION LOGIC LOGIC PWM PWM ...

  • 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. Name SDIP10 DIP-7 SO16N 1 1 1...2 GND ...

  • 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 ...

  • 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

    VIPER28 Table 8. Controller section Symbol Parameter Feed-back pin V Over-load shut down 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 nd Over-current protection (2 OCP) I Second over-current threshold DMAX Over-voltage protection V Over-voltage protection threshold OVP T Over-voltage protection strobe time STROBE Extra power management I Drain current limit with ...

  • 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 ...

  • 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 ...

  • 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 ...

  • 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

    Operation descriptions 7 Operation descriptions is a high-performance low-voltage PWM controller chip with an 800 V, avalanche VIPER28 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

    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 ...

  • Page 16

    Operation descriptions Figure 19. Timing diagram: normal power-up and power-down sequences DRAIN_START DDon V DDoff V DD(RESTART) V DRAIN (3mA) DDch Figure 20. Soft-start: timing diagram 16/32 Normal operation Power-on I ...

  • 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 ...

  • 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

    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 ...

  • Page 20

    Operation descriptions 7.9 About CONT pin Referring to the Figure 1. Current limit set point 2. Overvoltage protection on the converter output voltage The Table 9 on page 20 activate one or plus of the CONT pin functions. Figure 23. ...

  • 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, ...

  • 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

    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, as ...

  • Page 24

    Operation descriptions 7.12 Extra power management function (EPT) Some applications need an extra power for a limited time window during which the converter regulation has to be guaranteed. The extra power management function allows to design a converter that can ...

  • Page 25

    VIPER28 nd 7.13 2 level overcurrent protection and hiccup mode 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 ...

  • 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

    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 ...

  • 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 ...

  • 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 ...

  • Page 32

    ... 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. ...