VIPER17

Manufacturer Part NumberVIPER17
DescriptionVIPerPlus family: fixed frequancy high performance off line high voltage converter
ManufacturerSTMicroelectronics
VIPER17 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
Adapters for PDA, camcorders, shavers,
cellular phones, videogames
Auxiliary power supply for LCD/PDP TV,
monitors, audio systems, computer, industrial
systems, LED driver, No el-cap LED driver
SMPS for set-top boxes, DVD players and
recorders, white goods
Table 1.
Device summary
Order codes
VIPER17LN / VIPER17HN
VIPER17HD / VIPER17LD
VIPER17HDTR / VIPER17LDTR
June 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
VIPER17
GND
VDD
CONT
FB
Package
DIP-7
SO16 narrow
Doc ID 14419 Rev 7
VIPER17
DIP-7
+
DC Output voltage
-
Packaging
Tube
Tube
Tape and reel
1/31
www.st.com
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VIPER17 Summary of contents

  • Page 1

    ... LED driver, No el-cap LED driver ■ SMPS for set-top boxes, DVD players and recorders, white goods Table 1. Device summary Order codes VIPER17LN / VIPER17HN VIPER17HD / VIPER17LD VIPER17HDTR / VIPER17LDTR June 2010 Off-line high voltage converters SO16 narrow SO-16 Description ...

  • 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 overcurrent protection and hiccup mode . . . . . . . . . . . . . . . . . . 25 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2/31 Doc ID 14419 Rev 7 VIPER17 ...

  • Page 3

    ... LOGIC 6uA OVP FB 2 Typical power Table 2. Typical power Part number Adapter VIPER17 1. Typical continuous power in non ventilated enclosed adapter measured Maximum practical continuous power in an open frame design at 50 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 14419 Rev 7 Function threshold (see OVP activates the FBbm means that we are FBlin + V BRth BRhyst VIPER17 Table 8) BRth . ...

  • Page 5

    ... VIPER17 4 Electrical data 4.1 Maximum ratings Table 4. Absolute maximum ratings Pin Symbol (DIP7 DRAIN DRAIN V 3 CONT TOT STG 4.2 Thermal data Table 5. Thermal data Symbol Thermal resistance junction pin ...

  • Page 6

    ... Min Typ Max Unit GND GND, BR -0.4 -0.6 -0 after fault. 8.5 23 GND 7 4.5 = GND = 0 kHz GND kHz SW = 115 kHz SW VIPER17 V μA 60 Ω 24 Ω 100 23 8 0 μA 400 μA 270 ...

  • Page 7

    ... < 3 -100 μA I CONT -10 µA CONT ° 0 operating voltage range VIPER17L VIPER17H Doc ID 14419 Rev 7 Electrical data Min Typ Max Unit 4.5 4.8 5.2 V 3.2 3.3 3.4 V 0.4 0.45 0 -150 -200 -280 kΩ 4 ...

  • Page 8

    ... Clamp voltage BRclamp 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 14419 Rev 7 VIPER17 Min Typ Max Unit 0.6 A 2.7 3 3.3 V μs 2.2 0.41 0.45 0. μ ...

  • Page 9

    ... VIPER17 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 BR FB 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 14419 Rev 7 VIPER17 ...

  • Page 11

    ... VIPER17 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 14419 Rev 7 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 14419 Rev 7 VIPER17 time time time Normal operation ...

  • Page 13

    ... VIPER17 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 14419 Rev 7 ...

  • Page 14

    ... Operation descriptions 7 Operation descriptions VIPER17 is a high-performance low-voltage PWM controller chip with an 800 V, avalanche rugged power section. The controller includes: the oscillator with jittering feature, the start up circuits with soft-start feature, the PWM logic, the current limit circuit with adjustable set point, the second over current circuit, the burst mode management, the brown-out circuit, the UVLO circuit, the auto-restart circuit and the thermal protection circuit ...

  • Page 15

    ... VIPER17 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 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 14419 Rev 7 VIPER17 V < DRAIN_START HV startup is no more activated time regulation is lost here time time time Power-off STEADY STATE ...

  • Page 17

    ... VIPER17 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 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 VIPER17 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

    ... VIPER17 Equation 3 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

    ... R LIM 7.10 Feed-back and overload protection (OLP) The VIPER17 is a current mode converter: the feedback pin controls the PWM operation, controls the burst mode and actives the overload protection. Figure 29 show the internal current mode structure. With the feedback pin voltage between current is sensed and converted in voltage that is applied to the non inverting pin of the PWM comparator ...

  • Page 21

    ... VIPER17 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

    ... Doc ID 14419 Rev ⋅ DYN ) results much higher than C FB1 has to be FB1 From sense FET PWM To PWM Logic + - BURST BURST-MODE LOGIC OLP comparator To disable logic + - From R SENSE PWM To GATE driver + - BURST BURST-MODE LOGIC OLP comparator To disable logic + V FBolp - VIPER17 . FB ...

  • Page 23

    ... VIPER17 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 14419 Rev 7 Figure 31 , the following relationships and − BRhyst × BRth V I BRth BRhyst R × BRhyst + BRhyst Table order to VIPER17 ...

  • Page 25

    ... VIPER17 nd 7.13 2 level overcurrent protection and hiccup mode The VIPER17 is protected against short circuit of the secondary rectifier, short circuit on the 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

    ... Datum plane “H” coincident with the bottom of lead, where lead exits body. 5- Ref. POA MOTHER doc. 0037880 6- Creepage distance > 800 V 7- Creepage distance 250 V 8- Creepage distance as shown in the 664-1 CEI / IEC standard. 26/31 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 14419 Rev 7 VIPER17 ® 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

    ... VIPER17 Figure 33. Package dimensions Doc ID 14419 Rev 7 Package mechanical data 27/31 ...

  • Page 28

    ... Package mechanical data Table 11. SO16 narrow mechanical data Ref ccc 28/31 Dimensions 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 ID 14419 Rev 7 VIPER17 Max 1.75 0.25 0.51 0.25 10 6.2 4 0.5 1.27 8 0.1 ...

  • Page 29

    ... VIPER17 Figure 34. Package dimensions Doc ID 14419 Rev 7 Package mechanical data 29/31 ...

  • Page 30

    ... Initial release 2 Updated: Figure 1 on page 3 Added new SO16 package 4 Updated Equation 9, 5 Updated Chapter 7.13 on page 25 Updated application paragraph in coverpage and 6 page 7 7 Updated Figure 3 on page 4 Doc ID 14419 Rev 7 VIPER17 Changes 1, Figure 3 on page 4 Equation 10 Table 8 on and Table 3 on page 4 ...

  • Page 31

    ... VIPER17 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. ...