VIPER12A-E STMicroelectronics, VIPER12A-E Datasheet
VIPER12A-E
Specifications of VIPER12A-E
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VIPER12A-E Summary of contents
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... Operation pictures Figure 12. Peak drain current vs feedback current Figure 13. Thermal shutdown 14/21 Doc ID 11977 Rev 2 VIPER12A-E ...
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... VIPER12A-E Figure 14. Switching frequency vs temperature Figure 15. Current limitation vs temperature Doc ID 11977 Rev 2 Operation pictures 15/21 ...
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... 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 ® ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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. ...