VIPER12A-E

Manufacturer Part NumberVIPER12A-E
DescriptionFixed frequency off line converter
ManufacturerSTMicroelectronics
VIPER12A-E datasheet
 


Specifications of VIPER12A-E

Constant Current Output350 mA, 700 mA, 1.05 A (selectable)Input Voltage Range90 to 264 VAC 50/60 Hz
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Low power offline switched-mode power supply primary switcher
Features
Fixed 60 kHz switching frequency
9 V to 38 V wide range V
DD
Current mode control
Auxiliary undervoltage lockout with hysteresis
High voltage start-up current source
Overtemperature, overcurrent and overvoltage
protection with auto-restart
Typical power capability
– European (195 - 265 Vac) 8 W for SO-8,
13 W for DIP-8
– European (85 - 265 Vac) 5 W for SO-8,
8 W for DIP-8
Description
The VIPER12A combines a dedicated current
mode PWM controller with a high voltage power
MOSFET on the same silicon chip.
Figure 1.
Block diagram
REGULATOR
INTERNAL
SUPPLY
_
VDD
8/14.5V
+
+
_
42V
FB
December 2010
voltage
Typical applications cover off line power supplies
for battery charger adapters, standby power
supplies for TV or monitors, auxiliary supplies for
motor control, etc.
The internal control circuit offers the following
benefits: Large input voltage range on the V
accommodates changes in auxiliary supply
voltage (This feature is well adapted to battery
charger adapter configurations), automatic burst
mode in low load condition and overvoltage
protection in HICCUP mode.
ON/OFF
60kHz
OSCILLATOR
PWM
S
LATCH
OVERTEMP.
FF
R1
Q
DETECTOR
R2
R3
R4
BLANKING
OVERVOLTAGE
LATCH
R
FF
S
Q
Doc ID 11977 Rev 2
VIPER12A-E
SO-8
DIP-8
DD
DRAIN
+
_
0.23 V
230 Ω
1 kΩ
SOURCE
www.st.com
pin
1/21
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VIPER12A-E Summary of contents

  • Page 1

    ... HICCUP mode. ON/OFF 60kHz OSCILLATOR PWM S LATCH OVERTEMP DETECTOR BLANKING OVERVOLTAGE LATCH Doc ID 11977 Rev 2 VIPER12A-E SO-8 DIP-8 DD DRAIN + _ 0.23 V 230 Ω 1 kΩ SOURCE www.st.com pin 1/21 21 ...

  • Page 2

    ... Pin connections and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Rectangular U-I output characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Wide range of VDD voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Feedback pin principle of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Startup sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 Overvoltage threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9 Operation pictures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 11 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/21 Doc ID 11977 Rev 2 VIPER12A-E ...

  • Page 3

    ... VIPER12A-E 1 Electrical data 1.1 Maximum rating Stressing the device above the rating listed in the “absolute maximum ratings” table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied ...

  • Page 4

    ... I = 0.5 mA (See Figure 11 on page 13) (See Figure 10, Figure 11 on page 13) (See Figure 10, Figure 11 on page 13)) (See Figure 10 on page 13) Doc ID 11977 Rev 2 VIPER12A-E Min Typ Max Unit 730 V 0 Ω 54 100 Min Typ Max Unit ...

  • Page 5

    ... VIPER12A-E Table 5. Oscillation section Symbol Parameter Oscillator frequency F OSC total variation Table 6. PWM comparator section Symbol Parameter Peak current I Dlim limitation I I shutdown current FBsd FB FB pin input R FB impedance Current sense delay turn-OFF t Blanking time b Minimum Turn-ON ...

  • Page 6

    ... FB FB CONTROL VIPer12A Pin Function DD : Voltage value (typically 14 which the device starts switching and turns : Voltage value (typically which the device stops switching and turns on Doc ID 11977 Rev 2 VIPER12A-E SOURCE 1 8 SOURCE VDD 4 5 DIP-8 ...

  • Page 7

    ... VIPER12A-E 4 Rectangular U-I output characteristics Figure 4. Rectangular U-I output characteristics for battery charger A complete regulation scheme can achieve combined and accurate output characteristics. Figure 4. presents a secondary feedback through an optocoupler driven by a TSM101. This device offers two operational amplifiers and a voltage reference, thus allowing the regulation of both output voltage and current ...

  • Page 8

    ... Since the TSM101 is also supplied in forward mode, it keeps the current regulation up whatever the output voltage is.The V the input voltage, that is to say with a ratio of about 4 for a wide range application. 8/21 voltage DD Figure 4 on page 7 DD Doc ID 11977 Rev 2 VIPER12A-E a forward configuration has been pin voltage may vary as much as ...

  • Page 9

    ... VIPER12A-E 6 Feedback pin principle of operation A feedback pin controls the operation of the device. Unlike conventional PWM control circuits which use a voltage input (the inverted input of an operational amplifier), the FB pin is sensitive to current. Figure 5. Internal current control structure The power MOSFET delivers a sense current I R2 receives this current and the current coming from the FB pin ...

  • Page 10

    ... This figure also takes into account the internal blanking time and its Doc ID 11977 Rev V). This leads ⎛ ⎞ ⋅ ------ - + ------ - ⎝ ⎠ Figure 5 < FBsd exceeds this threshold the device will FB 14, and I value is specified in FBsd and I as shown VIPER12A-E which , where ...

  • Page 11

    ... VIPER12A-E 7 Startup sequence Figure 7. Startup sequence This device includes a high voltage start up current source connected on the drain of the device. As soon as a voltage is applied on the input of the converter, this start up current source is activated as long as V current source is switched off and the device begins to operate by turning on and off its main power MOSFET ...

  • Page 12

    ... Note that this event is only latched for the time needed and then the device resumes normal operation automatically. DDoff Figure 8. Overvoltage sequence DDovp V DDon V DDoff V DS 12/21 pin allows the VIPER12A to reset itself when V DD Figure 8., which shows the whole sequence of an Doc ID 11977 Rev 2 VIPER12A reach ...

  • Page 13

    ... VIPER12A-E 9 Operation pictures Figure 9. Rise and fall time Figure 10. Start- DD0 V DDhyst V DDoff I DDch Figure 11. Restart duty-cycle current DDon V = 100 kHz sw Doc ID 11977 Rev 2 Operation pictures 13/21 ...

  • Page 14

    ... Operation pictures Figure 12. Peak drain current vs feedback current Figure 13. Thermal shutdown 14/21 Doc ID 11977 Rev 2 VIPER12A-E ...

  • Page 15

    ... VIPER12A-E Figure 14. Switching frequency vs temperature Figure 15. Current limitation vs temperature Doc ID 11977 Rev 2 Operation pictures 15/21 ...

  • Page 16

    ... Package mechanical data 10 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. ECOPACK trademark. 16/21 Doc ID 11977 Rev 2 VIPER12A-E ® ...

  • Page 17

    ... VIPER12A-E Table 10. DIP8 mechanical data Ref Package Weight Figure 16. Package dimensions Databook (mm) Min. Nom. 0.38 2.92 3.30 0.36 0.46 1.14 1.52 0.20 0.25 9.02 9.27 7.62 7.87 6.10 6.35 2.54 7.62 2.92 3.30 Gr. 470 Doc ID 11977 Rev 2 Package mechanical data Max. 5.33 4.95 0.56 1.78 0.36 10.16 8.26 7.11 10.92 3.81 17/21 ...

  • Page 18

    ... Package mechanical data Table 11. SO8 mechanical data Dim ddd Figure 17. Package dimensions 18/21 Databook (mm) Nom Min 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 5.80 0.25 0.40 8° (max.) Doc ID 11977 Rev 2 VIPER12A-E Max 1.75 0.25 1.65 0.51 0.25 5.00 4.00 6.20 0.50 1.27 0.1 ...

  • Page 19

    ... VIPER12A-E 11 Order codes Table 12. Order codes Order codes VIPER12ASTR-E VIPER12AS-E VIPER12ADIP-E Package SO-8 SO-8 DIP-8 Doc ID 11977 Rev 2 Order codes Packaging Tape and reel Tube Tube 19/21 ...

  • Page 20

    ... Revision history 12 Revision history Table 13. Document revision history Date 09-Jan-2006 13-Dec-2010 20/21 Revision 1 Initial release. Updated Table 3 on page 2 on page 13. Doc ID 11977 Rev 2 VIPER12A-E Changes 4, Table 4 on page 4 and Figure 10 ...

  • Page 21

    ... VIPER12A-E 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. ...