VIPER20ADIP-E

VIPer20A-E SMPS primary I.C. General features Type VIPer20A-E VIPer20ASP-E VIPer20ADIP-E ■ ■ ■ ■ VDSS 700V 700V 700V In 0.5A 0.5A 0.5A RDS(on) 18Ω 18Ω 18Ω 10 PENTAWATT HV DIP-8 Adjustable switching frequency up to 200 kHz Current mode control Soft start and shutdown control Automatic burst mode operation in stand-by condition able to meet “blue angel” norm ( -------------------V DDhyst where: IDD is the consumption current on the VDD pin when switching. Refer to specified IDD1 and IDD2 values. tSS is the start up time of the converter when the device begins to switch. Worst case is generally at full load. VDDhyst is the voltage hysteresis of the UVLO logic (refer to the minimum specified value). 12/34 VIPer20A-E Operation description The soft start feature can be implemented on the COMP pin through a simple capacitor which will be also used as the compensation network. In this case, the regulation loop bandwidth is rather low, because of the large value of this capacitor. In case a large regulation loop bandwidth is mandatory, the schematics of (see Figure 17) can be used. It mixes a high performance compensation network together with a separate high value soft start capacitor. Both soft start time and regulation loop bandwidth can be adjusted separately. If the device is intentionally shut down by tying the COMP pin to ground, the device is also performing start-up cycles, and the VDD voltage is oscillating between VDDon and VDDoff. This voltage can be used for supplying external functions, provided that their consumption does not exceed 0.5mA. (see Figure 18) shows a typical application of this function, with a latched shutdown. Once the "Shutdown" signal has been activated, the device remains in the Off state until the input voltage is removed. 5.4 Transconductance error amplifier The VIPer20A-E includes a transconductance error amplifier. Transconductance Gm is the change in output current (ICOMP) versus change in input voltage (VDD). Thus: ∂l COMP G m = -----------------∂V DD The output impedance ZCOMP at the output of this amplifier (COMP pin) can be defined as: ∂ COMP 1 - ∂ COMP Z COMP = -------------------- = ------- × -----------------------I Gm ∂V DD ∂ COMP V V This last equation shows that the open loop gain AVOL can be related to Gm and ZCOMP: AVOL = Gm x ZCOMP where Gm value for VIPer20A-E is 1.5 mA/V typically. Gm is defined by specification, but ZCOMP and therefore AVOL are subject to large tolerances. An impedance Z can be connected between the COMP pin and ground in order to define the transfer function F of the error amplifier more accurately, according to the following equation (very similar to the one above): F(S) = Gm x Z(S) The error amplifier frequency response is reported in for different values of a simple resistance connected on the COMP pin. The unloaded transconductance error amplifier shows an internal ZCOMP of about 330KΩ More complex impedance can be connected on the COMP pin to . achieve different compensation level. A capacitor will provide an integrator function, thus eliminating the DC static error, and a resistance in series leads to a flat gain at higher frequency, insuring a correct phase margin. This configuration is illustrated in Figure 20 As shown in Figure 19 an additional noise filtering capacitor of 2.2nF is generally needed to avoid any high frequency interference. Is also possible to implement a slope compensation when working in continuous mode with duty cycle higher than 50%. Figure 21 shows such a configuration. Note: R1 and C2 build the classical compensation network, and Q1 is injecting the slope compensation with the correct polarity from the oscillator sawtooth. 13/34 Operation description VIPer20A-E 5.5 External clock synchronization: The OSC pin provides a synchronisation capability when connected to an external frequency source. Figure 21 shows one possible schematic to be adapted, depending the specific needs. If the proposed schematic is used, the pulse duration must be kept at a low value (500ns is sufficient) for minimizing consumption. The optocoupler must be able to provide 20mA through the optotransistor. 5.6 Primary peak current limitation The primary IDPEAK current and, consequently, the output power can be limited using the simple circuit shown in Figure 22 . The circuit based on Q1, R1 and R2 clamps the voltage on the COMP pin in order to limit the primary peak current of the device to a value: V COMP – 0.5 I DPEAK = ------------------------------H ID where: R1 + R2 V COMP = 0.6 × -----------------R2 . The suggested value for R1+R2 is in the range of 220KΩ 5.7 Over-temperature protection Over-temperature protection is based on chip temperature sensing. The minimum junction temperature at which over-temperature cut-out occurs is 140ºC, while the typical value is 170ºC. The device is automatically restarted when the junction temperature decreases to the restart temperature threshold that is typically 40ºC below the shutdown value (see Figure 13) 14/34 VIPer20A-E Operation description 5.8 Operation pictures VDD Regulation point Slope = G in m m A/V Figure 5. Figure 6. Undervoltage lockout ICOMP ICOMPHI IDD IDD0 VDD 0 ICOMPLO VDDreg FC00150 VDDhyst VDDoff IDDch VDS= 35 V Fsw = 0 VDDon VDD FC00170 Figure 7. Transition time ID Figure 8. Shutdown action VOSC t 10% Ipeak t VCOMP VDS tDISsu 90% VD VCOMPth t 10% VD t tf tr FC00160 ID t ENABLE ENABLE DISABLE FC00060 Figure 9. Breakdown voltage vs temperature 1.15 FC00180 Figure 10. Typical frequency variation (%) 1 0 -1 -2 -3 FC00190 BVDSS (Normalized) 1.1 1.05 1 -4 -5 0 20 40 60 80 100 120 Temperature (°C) 0.95 0 20 40 60 80 100 120 140 Temperature (°C) 15/34 Operation description VIPer20A-E Figure 11. Behaviour of the high voltage current source at start-up VDD VDDon VDDoff 2 mA 15 mA CVDD VDD 1 mA 15 mA 3 mA DRAIN Ref. t Auxiliary primary winding UNDERVOLTAGE LOCK OUT LOGIC VIPer20 SOURCE Start up duty cycle ~ 12% FC00101A Figure 12. Start-up waveforms 16/34 VIPer20A-E Figure 13. Over-temperature protection Operation description T T ts c J T t s d -T h y s t t Vdd V dd on V dd off t Id t V co m p t SC 1 0 1 9 1 17/34 Operation description VIPer20A-E Figure 14. Oscillator For Rt > 1.2kΩ and Ct ≤40KHz Rt OSC VDD CLK Ct ~360Ω FC00050 Ct Forbidden area Ct(nF) = 22nF 15nF 880 Fsw(kHz) Forbidden area 40kHz Fsw FC00030 Oscillator frequency vs Rt and Ct 1,000 Ct = 1.5 nF 500 Ct = 2.7 nF Frequency (kHz) 300 200 Ct = 4.7 nF Ct = 10 nF 100 50 30 1 2 3 5 10 20 30 50 Rt (kΩ) 18/34 VIPer20A-E Figure 15. Error amplifier frequency response FC00200 Operation description 60 RCOMP = +∞ RCOMP = 270k Voltage Gain (dB) 40 RCOMP = 82k RCOMP = 27k 20 RCOMP = 12k 0 (20) 0.001 0.01 0.1 1 10 Frequency (kHz) 100 1,000 Figure 16. Error amplifier phase response FC00210 200 RCOMP = +∞ 150 Phase (°) 100 50 0 (50) 0.001 RCOMP = 270k RCOMP = 82k RCOMP = 27k RCOMP = 12k 0.01 0.1 1 10 Frequency (kHz) 100 1,000 19/34 Operation description VIPer20A-E Figure 17. Mixed soft start and compensation D2 Figure 18. Latched shut down VIPer20 VDD OSC 13V DRAIN D3 R1 VDD VIPer20 DRAIN + COMP SOURCE R3 D1 Q2 OSC 13V + COMP SOURCE AUXILIARY WINDING R2 R3 R2 C4 R1 R4 Shutdown + C3 C1 + C2 Q1 D1 FC00431 FC00440 Figure 19. Typical compensation network VIPer20 VDD OSC 13V DRAIN Figure 20. Slope compensation + COMP SOURCE R2 R1 VIPer20 VDD OSC 13V DRAIN + COMP SOURCE C2 R1 C1 C1 Q1 C2 C3 R3 FC00451 FC00461 Figure 21. External clock sinchronisation Figure 22. Current limitation circuit example VIPer20 VDD DRAIN VIPer20 VDD OSC DRAIN OSC 13V + COMP SOURCE 13V + COMP SOURCE 10 kΩ R1 Q1 FC00470 R2 FC00480 20/34 VIPer20A-E Electrical over stress 6 6.1 Electrical over stress Electrical over stress ruggedness The VIPer may be submitted to electrical over-stress, caused by violent input voltage surges or lightning. Following the Layout Considerations is sufficient to prevent catastrophic damages most of the time. However in some cases, the voltage surges coupled through the transformer auxiliary winding can exceed the VDD pin absolute maximum rating voltage value. Such events may trigger the VDD internal protection circuitry which could be damaged by the strong discharge current of the VDD bulk capacitor. The simple RC filter shown in Figure 23 can be implemented to improve the application immunity to such surges. Figure 23. Input voltage surges protection R1 (Optional) R2 39R D1 Auxilliary winding C2 22nF OSC 13V VIPerXX0 VDD + DRAIN C1 Bulk capacitor COMP SOURCE 21/34 Layout VIPer20A-E 7 7.1 Layout Layout considerations Some simple rules insure a correct running of switching power supplies. They may be classified into two categories: – Minimizing power loops: The switched power current must be carefully analysed and the corresponding paths must be as small an inner loop area as possible. This avoids radiated EMC noises, conducted EMC noises by magnetic coupling, and provides a better efficiency by eliminating parasitic inductances, especially on secondary side. Using different tracks for low level and power signals: Interference due to mixing of signal and power may result in instabilities and/or anomalous behaviour of the device in case of violent power surge (Input overvoltages, output short circuits...). Loops C1-T1-U1, C5-D2-T1, and C7-D1-T1 must be minimized. C6 must be as close as possible to T1. Signal components C2, ISO1, C3, and C4 are using a dedicated track connected directly to the power source of the device. – In case of VIPer, these rules apply as shown on (see Figure 24). – – – Figure 24. Recommended layout T1 D1 D2 C7 To secondary filtering and load R1 VDD DRAIN C1 OSC 13V + COMP SOURCE C5 From input diodes bridge U1 VIPerXX0 R2 C2 C3 ISO1 C4 C6 FC00500 22/34 VIPer20A-E Package mechanical data 8 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect . The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 23/34 Package mechanical data VIPer20A-E Table 9. Dim Pentawatt HV Mechanical data mm. Min Typ Max 4.80 1.37 2.80 0.55 0.80 5.21 7.80 9.70 10.40 10.05 15.60 14.60 21.20 22.20 2.60 15.10 6 2.50 4.50 0.50 90° 3.65 3.85 0.144 0.152 10.40 17.30 15.22 21.85 22.82 3 15.80 6.60 3.10 5.60 6.14 0.575 0.835 0.874 0.102 0.594 0.236 0.098 0.177 0.02 0.396 Min 0.169 0.046 0.094 0.014 0.024 0.193 0.295 0.366 inch Typ Max 0.189 0.054 0.11 0.022 0.031 0.205 0.307 0.382 0.409 0.409 0.681 0.599 0.860 0.898 0.118 0.622 0.260 0.122 0.220 A C D E F G1 G2 H1 H2 H3 L L1 L2 L3 L5 L6 L7 M M1 R V4 Diam 4.30 1.17 2.40 0.35 0.60 4.91 7.49 9.30 Figure 25. Package dimension P023H3 24/34 VIPer20A-E Table 10. Dim Min A C D E F G1 G2 H1 H2 H3 L L1 L3 L5 L6 L7 M M1 R V4 Diam 3.65 10.05 16.42 14.60 20.52 2.60 15.10 6.00 2.50 5.00 0.50 90° 3.85 0.144 4.30 1.17 2.40 0.35 0.60 4.91 7.49 9.30 Typ Max 4.80 1.37 2.80 0.55 0.80 5.21 7.80 9.70 10.40 10.40 17.42 15.22 21.52 3.00 15.80 6.60 3.10 5.70 0.396 0.646 0.575 0.808 0.102 0.594 0.236 0.098 0.197 0.02 Min 0.169 0.046 0.094 0.014 0.024 0.193 0.295 0.366 Package mechanical data Pentawatt HV 022Y ( Vertical High Pitch ) Mechanical data mm. inch Typ Max 0.189 0.054 0.110 0.022 0.031 0.205 0.307 0.382 0.409 0.409 0.686 0.599 0.847 0.118 0.622 0.260 0.122 0.224 0.020 90° 0.154 Figure 26. Package dimension L L1 E M1 G2 G1 A M D C R Resin between leads L6 L7 V4 H1 H3 H2 F DIA L3 L5 25/34 Package mechanical data VIPer20A-E Table 11. Dim. DIP-8 Mechanical data mm Min Typ 3.32 0.51 1.15 0.356 0.204 7.95 2.54 7.62 7.62 6.6 5.08 3.18 3.81 1.52 0.125 1.65 0.55 0.304 10.92 9.75 0.313 0.100 0.300 0.300 0.260 0.200 0.150 0.060 0.020 0.045 0.014 0.008 0.065 0.022 0.012 0.430 0.384 Max Min Inch Typ 0.131 Max A a1 B b b1 D E e e3 e4 F I L Z Figure 27. Package dimensions 26/34 VIPer20A-E Package mechanical data Table 12. Dim. PowerSO-10 mechanical data mm Min Typ Max 3.65 0.10 0.60 0.55 9.60 7.60 1.27 9.30 7.20 7.20 6.10 5.90 1.25 0.50 13.80 1.20 1.70 0o 8o 14.40 1.80 0.543 0.047 0.067 9.50 7.40 7.60 6.35 6.10 1.35 0.366 0.283 0.283 0.240 0.232 0.049 0.002 0.567 0.071 Min 0.132 0.000 0.016 0.013 0.370 0.291 0.050 0.374 0.291 0.300 0.250 0.240 0.053 Inch Typ Max 0.144 0.004 0.024 0.022 0.378 0.300 A A1 B C D D1 e E E1 E2 E3 E4 F h H L q α 3.35 0.00 0.40 0.35 9.40 7.40 Figure 28. Package dimension 27/34 Package mechanical data VIPer20A-E Figure 29. Power Pad layout Figure 30. Tube shipment Table 13. Tube shipment Base Q.ty Bulk Q.ty 1000 1000 Tube length (± 0.5) 532 532 A 10.4 4.9 B 16.4 17.2 C (± 0.1) 0.8 0.8 50 50 Casablanca Muar 28/34 VIPer20A-E Figure 31. Reel shipment Package mechanical data Table 14. Reel dimension Base Q.ty Bulk Q.ty A (max) B (min) C (± 0.2) F G (± 0.2) N (min) T (max) 600 600 330 1.5 13 20.2 24.4 60 30.4 Note: All dimensoin are in mm. 29/34 Package mechanical data VIPer20A-E Figure 32. Tape shipment Table 15. Tape dimension Tape width Tape Hole Spacing Component Spacing Hole Diameter Hole Diameter Hole Position Compartment Depth Hole Spacing W P0 (± 0.1) P D (± 0.1/-0) D1 (min) F (± 0.05) K (max) P1 (± 0.1) 24 4 24 1.5 1.5 11.5 6.5 2 Note: All dimensions are in mm. 30/34 VIPer20A-E Figure 33. Pentawatt HV tube shipment ( no suffix ) Package mechanical data Table 16. Tube dimension 50 1000 532 18 33.1 1 Base Q.ty Bulk Q.ty Tube length (± 0.5 ) A B C (± 0.1) Note: All dimensions are in mm. Figure 34. Dip-8 Tube shipment (no suffix) Table 17. Tube dimension 20 1000 532 8.4 11.2 0.8 Base Q.ty Bulk Q.ty Tube length (± 0.5 ) A B C (± 0.1) Note: All dimensions are in mm. 31/34 Order code VIPer20A-E 9 Order code Table 18. Order code Part number VIPer20A-E VIPer20A-22-E VIPer20ADIP-E VIPer20ASP-E Package PENTAWATT HV PENTAWATT HV (022Y) DIP-8 PowerSO-10 32/34 VIPer20A-E Revision history 10 Revision history Table 19. Date 28-Sep-2005 21-Jun-2006 Revision history Revision 1 2 Initial release. New template, few updates Changes 33/34 VIPer20A-E Please Read Carefully: 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. 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