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| ADVANCE INFORMATION Data Sheet No. PD60175-C IR2171 LINEAR CURRENT SENSING IC Features * * * * * * * Floating channel up to +600V Monolithic integration Linear current feedback through shunt resistor Direct digital PWM output for easy interface Low IQBS allows the boot strap power supply High Common Mode Noise Immunity Input overvoltage Protection for IGBT short circuit condition Product Summary VOFFSET IQBS Vin Gain temp. drift fo 600V 1mA +/-260mVmax 20ppm/oC(typ.) 40kHz (typ.) * Open Drain output Descriptions IR2171 is the linear current sensing IC designed for motor drive applications. It senses the motor phase current through an extenal shunt resistor, converts from analog to digital signal, and transfers the signal to the low side. IR's proprietary high voltage isolation technology is implemented to enable the high bandwidth signal processing. The output format is discrete PWM at 40kHz to eliminate need for the A/D input interface. It allows direct interface to uP via simple counter based measurement. The independently powered output enables easy interface to the opto coupler device for galvanic isolation if needed. Packages 8 Lead SOIC 8 Lead PDIP 16 Lead SOIC (wide body) Block Diagram 15V PWM Output GND VCC PO V+ V- Up to 600V IR2171 COM NC VB VS To Motor Phase IR2171 ADVANCE INFORMATION Absolute Maximum Ratings Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters are absolute voltages referenced to COM, all currents are defined positive into any lead. The thermal resistance and power dissipation ratings are measured under board mounted and still air conditions. Symbol VS VBS VCC VIN VPO VINdV/dt PD Definition High side offset voltage High side floating supply voltage Low side and logic fixed supply voltage Maximum input voltage between VIN+ and VINDigital PWM output voltage VIN- input voltage (note 1) Allowable offset voltage slew rate Package power dissipation @ TA +25C 8 lead SOIC 8 lead PDIP 16 lead SOIC Min. -0.3 VS -0.3 -0.3 -5 COM -0.3 Vs -5 -- -- -- -- -- -- -- -- -55 -- Max. 600 25 25 5 VCC +0.3 VB+0.3 50 .625 1.0 1.25 200 125 100 150 150 300 Units V V/ns W RthJA Thermal resistance, junction to ambient 8 lead SOIC 8 lead PDIP 16 lead SOIC C/W TJ TS TL Junction temperature Storage temperature Lead temperature (soldering, 10 seconds) C Note 1: Capacitors are required between VB and Vin-, and between VB and Vs pins when bootstrap power is used. The external power supply, when used, is required between VB and Vin-, and between VB and Vs pins. Recommended Operating Conditions The output logic timing diagram is shown in figure 1. For proper operation the device should be used within the recommended conditions. Symbol VB VS VPO VCC VIN TA Definition High side floating supply voltage High side floating supply offset voltage Digital PWM output voltage Low side and logic fixed supply voltage Input voltage between VIN+ and VINAmbient temperature Min. VS +13.0 note 2 COM 9.5 -260 -40 Max. VS +20 600 VCC 20 +260 125 Units V mV C Note 2: Logic operation for Vs of -5 to +600V. Logic state held for Vs of -5V to -VBS. 2 www.irf.com ADVANCE INFORMATION IR2171 DC Electrical Characteristics VCC = VBS = 15V, unless otherwise specified. Symbol VIN VOS VOS/ TA G G/ TA ILK IQBS IQCC LIN LIN / TA IO- Definition Nominal input voltage range before saturation |VIN+ _ VIN-| Input offset voltage Input offset voltage temperature drift Gain (duty cycle % per VIN) Gain temperature drift Offset supply leakage current Quiescent VBS supply current Quiescent VCC supply current Linearity (duty cycle deviation from ideal linearity curve) Linearity temperature drift Output sink current Min. Typ. Max. Units Test Conditions -260 -10 -- 157 -- -- -- -- -- -- 20 2 -- 0 25 162 20 -- 1 -- 0.5 .005 -- -- 260 mV 10 -- 167 -- 50 2 1 1 -- -- -- % %/ oC mA VO = 1V VO = 0.1V V/oC %/V ppm/ oC A mA VB = VS = 600V VS = 0V max gain error=5% (Note 2) VIN = 0V (Note 1) Note 1: 10mV offset represents 1.5% duty cycle fluctuation Note 2: Gain = (full range of duty cycle in %) / (full input voltage range). AC Electrical Characteristics VCC = VBS = 15V, unless otherwise specified. Symbol Definition Propagation delay characteristics fo f / TA Dmin Dmax BW PHS Carrier frequency output Temperature drift of carrier frequency Minimum duty Maximum duty fo bandwidth Phase shift at 1kHz Min. Typ. Max. Units Test Conditions -- -- -- -- 40 500 7 93 15 -10 -- -- -- -- kHz ppm/oC % % kHz o figure 1 VIN = 0V & 5V VIN+=-260mV,VIN-=0 VIN+=+260mV,VIN-=0 VIN+=100mV pk-pk sine wave, -3dB VIN+=100mVpkpk sine wave www.irf.com 3 IR2171 ADVANCE INFORMATION Timing Waveforms PO Duty=7% Vin+= -260mV Vin- = 0V Duty=93% PO Vin+= +260mV Vin- = 0V Carrier Frequency = 40kHz Figure 1 Output waveform Application Hint: Temperature drift of the output carrier frequency can be cancelled by measuring both a PWM period and the on-time of PWM (Duty) at a same time. Since both periods vary in the same direction, computing the ratio between these values at each PWM periods gives consistent measurement of the current feedback over the temperature drift. 4 www.irf.com ADVANCE INFORMATION IR2171 Lead Definitions Symbol Description VCC COM VIN+ VINVB VS PO N.C. Low side and logic supply voltage Low side logic ground Positive sense input Negative sense input High side supply High side return Digital PWM output No connection Lead Assignment 1 VCC VIN+ 8 1 VCC VIN+ 8 1 NC NC 16 2 2 PO VIN- 7 2 PO VIN- NC NC 15 7 3 3 VCC VIN+ 14 COM VB 6 3 COM VB 6 4 PO VIN- 13 4 NC VS 5 4 NC VS 5 5 COM VB 12 6 NC VS 11 8 lead SOIC 8 lead PDIP IR2171S IR2171 7 NC NC 10 8 NC NC 9 16 lead SOIC IR21716S www.irf.com 5 IR2171 Case Outline ADVANCE INFORMATION 8 Lead SOIC (MS-012AA) 01-0021 09 8 Lead PDIP 6 01-3003 01 www.irf.com ADVANCE INFORMATION IR2171 16 Lead SOIC (wide body) 01-3014 03 IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105 IR EUROPEAN REGIONAL CENTRE: 439/445 Godstone Rd., Whyteleafe, Surrey CR3 0BL, United Kingdom Tel: ++ 44 (0) 20 8645 8000 IR JAPAN: K&H Bldg., 2F, 30-4 Nishi-Ikebukuro 3-Chome, Toshima-Ku, Tokyo, Japan 171-0021 Tel: 8133 983 0086 IR HONG KONG: Unit 308, #F, New East Ocean Centre, No. 9 Science Museum Road, Tsimshatsui East, Kowloon Hong Kong Tel: (852) 2803-7380 Data and specifications subject to change without notice. 6/29/2000 www.irf.com 7 |
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