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Design Example Report
Title 13W Multiple Output Supply using TOP242P Input: 195 - 265 VAC Specification Output: 2.5V/0.8A, 3.3V/0.7A, 5V/1.45A, 9V/50mA, 32V/5mA Application Author Document Number Date Revision Integrated Digital TV Decoder Power Integrations Applications Department DER-34 April 1, 2004 1.0
Summary and Features
* * * No heatsinks on the complete power supply Low Parts Count - Total estimated total BOM cost <$3.00 Very low output ripple and noise - Eliminates PSU interference in TV
The products and applications illustrated herein (including circuits external to the products and transformer construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations' patents may be found at www.powerint.com.
Power Integrations 5245 Hellyer Avenue, San Jose, CA 95138 USA. Applications Hotline: Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
DER-34
13W Integrated Digital TV PSU
April 1, 2004
Table Of Contents
Introduction................................................................................................................. 3 Power Supply Specification ........................................................................................ 4 Schematic................................................................................................................... 5 Circuit Description ...................................................................................................... 5 4.1 Design Architecture ............................................................................................. 6 4.2 Input Stage.......................................................................................................... 6 4.3 Primary Side Clamp ............................................................................................ 6 4.4 Output Rectification, Filtering and Feedback....................................................... 6 5 Bill Of Materials .......................................................................................................... 7 6 Transformer Specification........................................................................................... 8 6.1 Electrical Diagram ............................................................................................... 8 6.2 Electrical Specifications....................................................................................... 8 6.3 Materials.............................................................................................................. 8 6.4 Transformer Build Diagram ................................................................................. 9 6.5 Winding Instructions ............................................................................................ 9 7 Transformer Spreadsheet......................................................................................... 10 8 Measurements.......................................................................................................... 13 8.1 Efficiency........................................................................................................... 13 8.2 Line Regulation ................................................................................................. 13 9 Operating Waveforms .............................................................................................. 14 9.1 Output Ripple .................................................................................................... 14 9.1.1 High Frequency Ripple (132kHz) ............................................................... 15 9.1.2 Low frequency output ripple (100Hz) ......................................................... 16 10 Conducted EMI Measurements ............................................................................ 17 11 Revision History.................................................................................................... 18 1 2 3 4
Important Notes: Although this board is designed to satisfy safety isolation requirements, the engineering prototype has not been agency approved. Therefore, all testing should be performed using an isolation transformer to provide the AC input to the prototype board. Design Reports contain a power supply design specification, schematic, bill of materials, and transformer documentation. Performance data and typical operation characteristics are included. Typically only a single prototype has been built.
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 2 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
1 Introduction
This report describes a multiple output power supply for an integrated digital TV application. The design uses the advanced integrated features of TOP242P to give a low cost, minimal component count design. The report includes a full schematic, bill of materials and transformer design information. In addition, basic measurements on the prototype unit shown in Figure 1 have been given.
Figure 1 - 13W IdTV Power Supply Prototype
Measurements include full power efficiency, full power line regulation and output ripple measurements. When accurate min/max loads and loading combinations are known, cross-regulation measurements will be taken. Initial conducted EMI measurements have also been taken both with the output floating and the output grounded to protective Earth (i.e. chassis). For the prototype constructed here, only one LC post filter was used on the 5V output and the current on the 5VA and 5VD circuitry was combined to a single rail. The proposed schematic splits the 5V rail out with two LC post filters to increase the separation between 5VA and 5VD outputs.
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 3 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
2 Power Supply Specification
Description Input Voltage Frequency Output Output Voltage 1 Output Ripple Voltage 1 Output Current 1 Output Voltage 2 Output Ripple Voltage 2 Output Current 2 Output Voltage 3 Output Ripple Voltage 3 Output Current 3 Output Voltage 4 Output Ripple Voltage 4 Output Current 4 Output Voltage 5 Output Ripple Voltage 5 Output Current 5 Output Voltage 6 Output Ripple Voltage 6 Output Current 6 Total Output Power Continuous Output Power Efficiency Environmental Conducted EMI Ambient Temperature TAMB
Meets CISPR22B / EN55022B
Symbol VIN fLINE
Min 195 47
Typ
Max 265 64
Units VAC Hz
Comment
2 Wire - no P.E.
50/60
VOUT1 VRIPPLE1 IOUT1 VOUT2 VRIPPLE2 IOUT2 VOUT3 VRIPPLE3 IOUT3 VOUT4 VRIPPLE4 IOUT4 VOUT5 VRIPPLE5 IOUT5 VOUT6 VRIPPLE6 IOUT6 POUT
2.375
2.5
3.15
3.3
4.75
5 0.25 5
4.75
8.1
9
29
32
2.625 20 0.8 3.45 30 0.7 5.25 50 0.25 5.25 50 1.2 9.9 50 0.05 35 300 0.005 13
V mV A V mV A V mV A V mV A V mV A V mV A W %
5% 20 MHz Bandwidth 5% 20 MHz Bandwidth 5% 20 MHz Bandwidth 5% 20 MHz Bandwidth 10% 20 MHz Bandwidth 10% 20 MHz Bandwidth
75
Measured at full load, 25 oC
0
45
o
C
Free convection, sea level
Table 1 - Power Supply Specification
Notes:1) 2) 3) 4) All separate 3V3 rail currents were combined onto a single rail All separate 5V rail current were combined onto a single rail Voltage regulation specifications have been assumed Single 230V (195Vac to 265Vac) operation has been assumed
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 4 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
3 Schematic
NOTES: 1) Use of 1N4007G bridge diodes can help EMI at 150 kHz. 2) soft-finish diode (D13) may not be needed. 3) Snubber cap C4 can be 400V.
Figure 2- Schematic
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 5 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
4 Circuit Description
This schematic presented above details an isolated flyback power supply using TOP242P from Power Integrations. This IC integrates the following features to minimize PSU cost:Frequency jitter which reduces the QP and AV EMI levels by up to 10dB allowing for cheaper EMI filter components Soft-Start which prevents transformer saturation during start-up. This increases long term reliability Line UV and OV detection to give additional differential surge withstand capability to increase reliability Regulation to zero load without pre-load due to very low minimum duty cycle capability Line feed forward which improves 100Hz ripple rejection Hysteretic thermal and short circuit protection to increase long term reliability DIP08 package which requires no additional heatsink, minimizing BOM and manufacturing cost. 4.1 Design Architecture The approach used with this design is to provide the 2.5V output via a diode drop from the 3V3 rail. This technique is a good way to cost effectively produce 2.5V without significant efficiency penalty. If tighter regulation is required on 2.5V, a feedback resistor from 2.5V to the TL431 can be added. 4.2 Input Stage Mains input protection is provided by fuse F1 and a VDR, R14. Common-mode and differential mode EMI filtering is provided by C7, L5 and C3. AC rectification and bulk storage is provided by D4, D5, D8, D9 and C10. 4.3 Primary Side Clamp Primary side clamping is provided by D7, R4, R2 and C4. D7 is specified as 1N4007GP and it is important that the GP version is used. The GP version has a specified reverse recovery behavior, which recycles some of the clamp energy and aid efficiency. 4.4 Output Rectification, Filtering and Feedback Schottky diodes are used on both the 3V3 and 5V outputs to give good voltage centering and high efficiency. The 2V5 rail is provided using a UF5400 diode drop from the 3V3 rail. All rails use LC post filters to give very low output ripple and the 32V rail is provided by a charge pump driven from the AC side of the 32V winding. Feedback is derived from the 3V3 and 5V windings, which will give +/-5% accuracy on both rails. If tighter regulation is required on 2.5V, a feedback resistor from 2.5V to the TL431 can be added.
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 6 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
5 Bill Of Materials
Reference C1,C2 C3 C4 C5 C6 C7 C13,C8 C9,C12,C14 C10 C11 C15 C16 C17,C18 C19 D1,D2,D11,D13 D3 D4,D5,D8,D9 D10,D6 D7 D12 D14 F1 L1 L4,L9 L5 L7 T1 R1,R4 R2 R5,R3 R6 R7 R8 R9 R10 R11 R12 R13 R14 U1 U2 U3 Quantity 2 1 1 1 1 1 2 3 1 1 1 1 2 1 4 1 4 2 1 1 1 1 1 2 1 1 1 2 1 2 1 1 1 1 1 1 1 1 1 1 1 1 Total of 57 components Value / Description 10uF, 50V 1nF, Y1 SAFETY 1nF, 1kV 10uF, 35V 100uF, 16V 47nF, X2 CAP 470uF, 35V 100uF, 10V 22uF, 400V 4n7 1uF, 50V 47uF, 16V 100nF 10uF, 16V 1N4148 UF4001 1N4007 SB540 1N4007GP UF5400 BZX79C33 200mA, 250Vac 4.7uH, 0.2A 4.7uH, 2A 10mH, 0.2A 4.7uH, 0.5A EF20 Custom 100R 150k, 1W 1M 3R3 150R 6R8 6k4, 1% 20k, 1% 10k 3k3 10k, 1% 275V PC817 TOP242P TL431
Notes 1) All resistors are 1/8W, 5% unless otherwise specified.
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
IC's
Resistors
Magnetics
Misc
Diodes
Capacitors
Page 7 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
6 Transformer Specification
6.1 Electrical Diagram
1 PRIMARY 71 TURNS 0.32mm HEAVY NYLEZE 3 5 8 9V WINDING 2 TURNS BIFILAR 0.4mm TRIPLE INSULATED WIRE
7
5V WINDING 1 TURN BIFILAR 0.4mm TRIPLE INSULATED WIRE
4 PRIMARY 9 TURNS 0.32mm TRI-FILAR HEAVY NYLEZE 2
3V3 WINDING 2 TURNS QUADRAFILAR 0.4mm TRIPLE INSULATED WIRE 6
Figure 3 -Transformer Electrical Diagram
6.2
Electrical Specifications
1 second, 60 Hz, from pins 1-5 to pins 6-10 Pins 1-4, all other windings open. Measured at 132 kHz, 1 VRMS Pin 1-4, all other windings open Pins 1-4, with pins 6-10 shorted. Measured at 132 kHz, 1 VRMS 3000 VAC 1.5mH +15% 600 kHz (Min.) 50 H (Max.)
Electrical Strength Primary Inductance Resonant Frequency Primary Leakage Inductance
6.3
Materials
Item [1] [2] [3] [4] [5] [6] Description 2 Core: EF20/10/6, 3C85 or Equivalent, Gapped for AL of 311 nH/T Bobbin: EF20, 10 Pins Magnet Wire: 0.32mm (#28 AWG) Triple Insulated Wire : 0.4mm (#26 AWG) Tape: 3M 1298 Polyester Film, 12 mm wide Varnish
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 8 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
6.4
Transformer Build Diagram
8 7 5 6 2 5 1 3 Bias Primary
9V WINDING 5V WINDING 3V3 WINDING GND
Figure 4 - Transformer Build Diagram
6.5
Winding Instructions
Start at pin 3. Wind 36 turns of item [3] from left to right in a single layer. Continue from right to left with 35 further turns. Wind tightly and uniformly across entire width of bobbin. Terminate on pin 1. Apply 1 layer of tape item [5] for mechanical fixing Start at pin 5. Wind 9 tri-filar turns of item [3] from left to right in a single layer. Finish on pin 2. Apply 3 layers of tape item [5] for mechanical fixing Start at pin 6. Wind 2 quadrafilar turns of item [4] and terminate on pin 5. Continue with 1 further bifilar turn of item [4] and terminate on pin 7. Finish with 2 further bifilar turns of item [4] and terminate on pin 8. These three windings should occupy a single layer 3 Layers of tape [5] for insulation. Assemble and secure core halves. Item [1] Dip varnish uniformly in item [6]
Primary Insulation Bias Winding Insulation 3V3, 5V and 9V Windings Outer Insulation Core Assembly Final Varnish
NOTE: Spreading the 3V, 5V, and 9V windings across the layer, may produce better cross-regulation.
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 9 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
7 Transformer Spreadsheet
Power Supply Input
VACMIN VACMAX FL TC Volts Volts Hertz mSeconds 195 265 50 1.68 Min Input AC Voltage Max Input AC Voltage AC Main Frequency Bridge Rectifier Conduction Time Estimate Loss Allocation Factor Efficiency Estimate
Z N
%
0.66 76.0
Power Supply Outputs
VOx IOx VB IB Volts Amps Volts Amps 3.30 1.500 15.00 0.006 5.00 9.00 1.450 0.050 32.00 Output Voltage 0.005 Output Current Bias Voltage Bias Current
Device Variables
Device PO VDRAIN Watts Volts TOP242P/G 12.90 678 Device Name Total Output Power Maximum Drain Voltage Estimate (Includes Effect of Leakage Inductance) Device On-State Drain to Source Voltage Device Switching Frequency Ripple to Peak Current Ratio External Current Limit Ratio Device Current Limit External Minimum Device Current Limit Minimum Device Current Limit Maximum Peak Primary Current Primary RMS Current Maximum Duty Cycle
VDS
Volts
5.4
FS KRPKDP KI ILIMITEXT ILIMITMIN ILIMITMAX IP IRMS DMAX
Hertz
132000 1.00 1.00
Amps Amps Amps Amps Amps
0.42 0.42 0.48 0.39 0.14 0.37
Power Supply Components Selection
CIN VMIN uFarads Volts 15.0 239 Input Filter Capacitor Minimum DC Input
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 10 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
VMAX VCLO PZ VDB PIVB
Volts Volts Watts Volts Volts
375 200 1.7 0.7 59
Voltage Maximum DC Input Voltage Clamp Zener Voltage Estimated Primary Zener Clamp Loss Bias Winding Diode Forward Voltage Drop Bias Rectifier Maximum Peak Inverse Voltage
Power Supply Output Parameters
VDx PIVSx Volts Volts 0.5 14 0.5 20 0.5 35 1.0 Output Winding Diode Forward Voltage Drop 124 Output Rectifier Maximum Peak Inverse Voltage 0.02 Peak Secondary Current 0.01 Secondary RMS Current 0.01 Output Capacitor RMS Ripple Current
ISPx ISRMSx IRIPPLEx
Amps Amps Amps
4.98 2.29 1.73
4.82 2.21 1.67
0.17 0.08 0.06
Transformer Construction Parameters
Core/Bobbin Core Manuf. Bobbin Manuf LP NP NB OD Actual Primary Current Density mm A/mm^2 E20/10/6 (EF20) Margi Generic Generic 1571 71 8.26 0.28 2 Core and Bobbin Type Core Manufacturing Bobbin Manufacturing Primary Inductance Primary Winding Number of Turns Bias Winding Number of Turns Primary Actual Wire Diameter Primary Winding Current Density Warning! Primary current winding density (A/mm 2) is less than minimum Reflected Output Voltage Bobbin Physical Winding Width Safety Margin Width Number of Primary Layers
uHenries
VOR BW M L
Volts mm mm
135.00 12.50 0.0 2.0
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 11 of 19
DER-34
AE ALG BM BP BAC LG LL cm^2 nH/T^2 mTesla mTesla mTesla mm uHenries
13W Integrated Digital TV PSU
0.32 311 267 331 134 0.11 31.4
April 1, 2004
Core Effective Cross Section Area Gapped Core Effective Inductance Maximum Operating Flux Density Peak Flux Density AC Flux Density for Core Curves Gap Length Estimated Transformer Primary Leakage Inductance Estimated Secondary Trace Inductance
LSEC
nHenries
20
Secondary Parameters
NSx Rounded Down NSx 2.00 2.89 2 5.00 5 17.37 Secondary Number of Turns 17 Rounded to Integer Secondary Number of Turns 31.08 Auxiliary Output Voltage for Rounded to Integer NSx 18 Rounded to Next Integer Secondary Number of Turns 32.96 Auxiliary Output Voltage for Rounded to Next Integer NSx 0.03 - Secondary Actual 0.06
Rounded Down Vox
Volts
3.27
8.93
Rounded Up NSx
3
Rounded Up Vox ODS Actual Range
Volts
5.16
mm
0.51 0.81
0.51 - 0.09 0.81 0.14
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 12 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
8
Measurements
All measurements were performed in a lab ambient of 25C with the unit mounted horizontally in free air. 8.1 Efficiency
Efficiency was measured at the full power condition specified in Table 1. Figure 5 shows the results.
80 75 Efficiency (%) 70 65 60 55 50 180
200
220
240
260
280
Input Voltage (Vac)
Figure 5 - Full Power Efficiency Variation with Input Voltage
8.2
Line Regulation
Regulation (% of Nominal) 8 6 4 2 0 -2 -4 180 2V5 3V3 5V 9V 32V
200
220
240
260
280
Figure 6 - Input Voltage (Vac)
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 13 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
9 Operating Waveforms
9.1 Output Ripple
For DC output ripple measurements, a modified oscilloscope test probe must be utilized in order to reduce spurious signals due to pickup. Details of the probe modification are provided in Figure 7 and Figure 8. The 5125BA probe adapter is affixed with two capacitors tied in parallel across the probe tip. The capacitors include one (1) 0.1 F/50 V ceramic type and one (1) 1.0 F/50 V aluminum electrolytic. The aluminum electrolytic type capacitor is polarized, so proper polarity across DC outputs must be maintained (see below).
Probe Ground
Probe Tip
Figure 7 - Oscilloscope Probe Prepared for Ripple Measurement. (End Cap and Ground Lead Removed)
Figure 8 - Oscilloscope Probe with Probe Master 5125BA BNC Adapter. (Modified with wires for probe ground for ripple measurement, and two parallel decoupling capacitors added)
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 14 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
9.1.1 High Frequency Ripple (132kHz) The post LC filters on each output rail maintain very low high frequency output ripple. Ripple was measured at full power with 230Vac input.
Figure 9 - AC Coupled High Frequency Output Voltage Ripple. Left hand side is 3V3 (2mV/div) and right hand side is 5V (2mV/div).
Figure 10 - AC Coupled High Frequency Output Voltage Ripple. Left hand side is 9V (10mV/div) and right hand side is 32V (10mV/div)
The high frequency noise on the 2V5 output is the same as for the 3V3 rail since a single diode is used to drop the output voltage from 3V3 to 2V5.
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 15 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
9.1.2 Low frequency output ripple (100Hz)
Figure 11 - AC Coupled Low Frequency Output Voltage Ripple. Left hand side is 3V3 (5mV/div) and right hand side is 5V (10mV/div).
Figure 12 - AC Coupled Low Frequency Output Voltage Ripple. Left hand side is 9V (100mV/div) and right hand side is 32V (100mV/div).
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 16 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
10 Conducted EMI Measurements
The measurements presented in this section are pre-compliance and should only be used for guidance.
Figure 13 - Conducted EMI with 230Vac input. Full power with the output floating
Figure 14 - Conducted EMI with 230Vac input. Full power with the output grounded to Earth
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 17 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
11 Revision History
Date April 1, 2004 Author IM Revision 1.0 Description & changes Initial release Reviewed VC / AM
Power Integrations Tel: +1 408 414 9660 Fax: +1 408 414 9760 www.powerint.com
Page 18 of 19
DER-34
13W Integrated Digital TV PSU
April 1, 2004
For the latest updates, visit our Web site: www.powerint.com Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any license under its patent rights or the rights of others. The products and applications illustrated herein (including circuits external to the products and transformer construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations' patents may be found at www.powerint.com. The PI Logo, TOPSwitch, TinySwitch, LinkSwitch, and EcoSmart are registered trademarks of Power Integrations, Inc. PI Expert and DPA-Switch are trademarks of Power Integrations, Inc. (c) Copyright 2003, Power Integrations, Inc.
WORLD HEADQUARTERS NORTH AMERICA - WEST Power Integrations, Inc. 5245 Hellyer Avenue San Jose, CA 95138 USA. Main: +1-408-414-9200 Customer Service: Phone: +1-408-414-9665 Fax: +1-408-414-9765 e-mail: usasales@powerint.com CHINA Power Integrations International Holdings, Inc. Rm# 1705, Bao Hua Bldg. 1016 Hua Qiang Bei Lu Shenzhen Guangdong, 518031 Phone: +86-755-8367-5143 Fax: +86-755-8377-9610 e-mail: chinasales@powerint.com APPLICATIONS HOTLINE World Wide +1-408-414-9660
EUROPE & AFRICA Power Integrations (Europe) Ltd. Centennial Court Easthampstead Road Bracknell Berkshire RG12 1YQ, United Kingdom Phone: +44-1344-462-300 Fax: +44-1344-311-732 e-mail: eurosales@powerint.com KOREA Power Integrations International Holdings, Inc. Rm# 402, Handuk Building, 649-4 Yeoksam-Dong, Kangnam-Gu, Seoul, Korea Phone: +82-2-568-7520 Fax: +82-2-568-7474 e-mail: koreasales@powerint.com
SINGAPORE Power Integrations, Singapore 51 Goldhill Plaza #16-05 Republic of Singapore, 308900 Phone: +65-6358-2160 Fax: +65-6358-2015 e-mail: singaporesales@powerint.com JAPAN Power Integrations, K.K. Keihin-Tatemono 1st Bldg. 12-20 Shin-Yokohama 2-Chome, Kohoku-ku, Yokohama-shi, Kanagawa 222-0033, Japan Phone: +81-45-471-1021 Fax: +81-45-471-3717 e-mail: japansales@powerint.com
TAIWAN Power Integrations International Holdings, Inc. 17F-3, No. 510 Chung Hsiao E. Rd., Sec. 5, Taipei, Taiwan 110, R.O.C. Phone: +886-2-2727-1221 Fax: +886-2-2727-1223 e-mail: taiwansales@powerint.com INDIA (Technical Support) Innovatech #1, 8th Main Road Vasanthnagar Bangalore, India 560052 Phone: +91-80-226-6023 Fax: +91-80-228-9727 e-mail: indiasales@powerint.com
APPLICATIONS FAX World Wide +1-408-414-9760
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