VIPER26

Manufacturer Part NumberVIPER26
DescriptionVIPerPlus family: fixed frequency high performance off line high voltage converter
ManufacturerSTMicroelectronics
VIPER26 datasheet
 


1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Page 1/25

Download datasheet (810Kb)Embed
Next
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
On-board soft-start
Safe auto-restart after a fault condition
Hysteretic thermal shutdown
Application
Auxiliary power supply for appliances
Power metering
LED drivers
SMPS for set-top boxes, DVD players and
recorders
Table 1.
Device summary
Order codes
VIPER26LN
VIPER26HN
VIPER26HD
VIPER26HDTR
VIPER26LD
VIPER26LDTR
September 2010
Fixed frequency VIPer
SO16 narrow
SO-16
Description
The device is an off-line converter with an 800 V
AC
avalanche ruggedness power section, a PWM
controller, user defined overcurrent limit,
protection against feedback network
disconnection, hysteretic thermal protection, soft
start up and safe auto restart after any fault
condition.
Advance frequency jittering reduces EMI filter
cost. Burst mode operation and the devices very
low consumption both help to meet the standard
set by energy saving regulations.
Figure 1.
DC Input Voltage
Package
DIP-7
SO16 narrow
Doc ID 17736 Rev 2
VIPER26
TM
plus family
DIP-7
Typical topology (V
V
OUT
DDCSon
DC Output Voltage
-
DRAIN
DRAIN
COMP
COMP
VIPER26
VIPER26
GND
GND
VDD
VDD
LIM
LIM
FB
FB
Packaging
Tube
Tube
Tape and reel
Tube
Tape and reel
www.st.com
)
1/25
25

VIPER26 Summary of contents

  • Page 1

    ... Burst mode operation and the devices very low consumption both help to meet the standard set by energy saving regulations. Figure 1. DC Input Voltage Package DIP-7 SO16 narrow Doc ID 17736 Rev 2 VIPER26 TM plus family DIP-7 ≤ Typical topology (V V OUT DDCSon DC Output Voltage ...

  • Page 2

    ... Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 10 Soft start- Adjustable current limit set point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pin and COMP pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 13 Burst mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 14 Automatic auto restart after overload or short-circuit . . . . . . . . . . . . . 17 15 Open loop failure protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 16 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2/25 Doc ID 17736 Rev 2 VIPER26 ...

  • Page 3

    ... VIPER26 1 Block diagram Figure 2. Block diagram 2 Typical power Table 2. Typical power Part number VIPER26 1. Typical continuous power in non ventilated enclosed adapter measured Maximum practical continuous power in an open frame design at 50 sinking. 230 V AC (1) (2) Adapter Open frame Doc ID 17736 Rev 2 ...

  • Page 4

    ... The linear voltage range extends from V 7). (Table 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 17736 Rev 2 Function FB_REF to V COMPL COMPH VIPER26 on ...

  • Page 5

    ... VIPER26 4 Electrical data 4.1 Maximum ratings Table 4. Absolute maximum ratings Pin Symbol (DIP- DRAIN DRAIN V 5 COMP LIM TOT STG 4.2 Thermal data Table 5. Thermal data Symbol Thermal resistance junction pin ...

  • Page 6

    ... DRAIN kHz 120 V, DRAIN F = 115 kHz SW V < DDoff DDclamp V = 3.3 V, COMP startup threshold before setting DDon Doc ID 17736 Rev 2 VIPER26 Min Typ Max Unit 800 V µA 60 Ω 7 Ω Min Typ Max Unit 60 80 100 V -0.6 -1.8 ...

  • Page 7

    ... ° GND FB V > 100 GND GND COMP FB = -10 µ 3 LIM COMP COMP COMPL VIPER26L VIPER26H kHz OSC F = 115 kHz OSC Doc ID 17736 Rev 2 Electrical data Min Typ Max Unit 3.2 3.3 3.4 V µ mA/V 0 1.1 1 ...

  • Page 8

    ... Typical electrical characteristics 5 Typical electrical characteristics Figure 4. IDlim Figure DRAIN_START Figure 8/25 Figure 5. Figure 7. J Figure 9. Doc ID 17736 Rev 2 VIPER26 OSC COMP REF_FB J ...

  • Page 9

    ... VIPER26 Figure 10 COMP J Figure 12. Operating supply current (switching Figure 14. Power MOSFET on-resistance vs T Figure 11. Operating supply current Figure 13. IDlim Figure 15. Power MOSFET break down voltage J Doc ID 17736 Rev 2 Typical electrical characteristics (no switching LIM 9/25 ...

  • Page 10

    ... Typical circuits Figure 16. Thermal shutdown DDon V DDCSon V DDoff I DRAIN HYST Normal operation 6 Typical circuits Figure 17. Buck converter (V 10/25 Shut down after over temperature >V ) OUT DDCSon Doc ID 17736 Rev 2 VIPER26 time time time Normal operation ...

  • Page 11

    ... VIPER26 Figure 18. Fly-back converter (isolated) Figure 19. Flyback converter (primary regulation) Doc ID 17736 Rev 2 Typical circuits 11/25 ...

  • Page 12

    ... Typical circuits Figure 20. Flyback converter (non isolated, V Figure 21. Flyback converter (non isolated, V 12/ OUT DDCSon V [ OUT DDCSon Doc ID 17736 Rev 2 VIPER26 ) ) ...

  • Page 13

    ... I DRAIN_START voltage reaches the V high voltage current generator is turned OFF. The VIPer26 is powered by the external source. After the start-up, the auxiliary winding or the diode connected to the output voltage have to power the VDD capacitor with voltage higher than V on page 6) ...

  • Page 14

    ... Oscillator 9 Oscillator The switching frequency is internally fixed at 60 kHz (VIPER26LN or LD) or 115 kHz (VIPER26HN or HD). In both cases the switching frequency is modulated by approximately ±4 kHz (60 kHz version) or ±8 kHz (115 kHz version) at 230 Hz (typical) rate, so that the resulting spread- spectrum action distributes the energy of each harmonic of the switching frequency over a number of sideband harmonics having the same energy on the whole but smaller amplitudes ...

  • Page 15

    ... VIPER26 12 FB pin and COMP pin The device can be used both in non-isolated and in isolated topology. In case of non- isolated topology, the feedback signal from the output voltage is applied directly to the FB pin as inverting input of the internal error amplifier having the reference voltage, V Table 8 on page ...

  • Page 16

    ... Dlim_bm DD Doc ID 17736 Rev 2 , the power MOSFET is kept in COMPL Table 7 on current, as reported on voltage increases and as soon COMP , the converter starts switching again with Table 8 on page 7) in order to Burst Mode VIPER26 time time time ...

  • Page 17

    ... VIPER26 14 Automatic auto restart after overload or short-circuit The overload protection is implemented in automatic way using the integrated up-down counter. Every cycle incremented or decremented depending if the current logic detects the limit condition or not. The limit condition is the peak drain current, I Table 8 on page 7 ...

  • Page 18

    ... Open loop failure protection 15 Open loop failure protection In case the power supply is built in fly-back topology and the VIPer26 is supplied by an auxiliary winding, as shown in converter is protected against feedback loop failure or accidental disconnections of the winding. The following description is applicable for the schematics of Figure 28 on page ...

  • Page 19

    ... VIPER26 Figure 28. FB pin connection for isolated fly-back Doc ID 17736 Rev 2 Open loop failure protection 19/25 ...

  • Page 20

    ... ECOPACK specifications, grade definitions and product status are available at: www.st.com. ® ECOPACK trademark. Table 9. DIP-7 mechanical data Dim 20/25 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 17736 Rev 2 VIPER26 ® 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 21

    ... VIPER26 Figure 29. DIP-7 package dimensions Doc ID 17736 Rev 2 Package mechanical data 21/25 ...

  • Page 22

    ... Package mechanical data Table 10. SO16N mechanical data Dim ccc 22/25 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 17736 Rev 2 VIPER26 Max 1.75 0.25 0.51 0.25 10 6.2 4 0.5 1.27 8 0.1 ...

  • Page 23

    ... VIPER26 Figure 30. SO16N package dimensions Doc ID 17736 Rev 2 Package mechanical data 23/25 ...

  • Page 24

    ... Revision history 17 Revision history Table 11. Document revision history Date 26-Aug-2010 01-Sep-2010 24/25 Revision 1 Initial release. Figure 30 on page 2 Updated Doc ID 17736 Rev 2 VIPER26 Changes 23. ...

  • Page 25

    ... VIPER26 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. ...