ADVANCE INFORMATION Data Sheet No. PD60175-C IR2171 LINEAR CURRENT SENSING IC Features • • • • • • • Product Summary 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 • 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. Block Diagram 15V PWM Output VOFFSET 600V IQBS 1mA Vin +/-260mVmax Gain temp. drift fo 20ppm/oC(typ.) 40kHz (typ.) Packages 8 Lead SOIC 8 Lead PDIP 16 Lead SOIC (wide body) Up to 600V V+ VCC V- PO IR2171 GND COM VB NC VS To Motor Phase ADVANCE INFORMATION IR2171 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 Definition VS High side offset voltage VBS High side floating supply voltage VCC Low side and logic fixed supply voltage VIN Maximum input voltage between VIN+ and VIN- VPO Digital PWM output voltage VIN- VIN- input voltage (note 1) dV/dt PD RthJA Allowable offset voltage slew rate Package power dissipation @ TA ≤ +25°C Thermal resistance, junction to ambient Min. Max. -0.3 600 Units VS -0.3 25 -0.3 25 -5 5 COM -0.3 VCC +0.3 Vs -5 VB+0.3 — 50 8 lead SOIC — .625 8 lead PDIP — 1.0 16 lead SOIC — 1.25 8 lead SOIC — 200 8 lead PDIP — 125 16 lead SOIC — 100 TJ Junction temperature — 150 TS Storage temperature -55 150 TL Lead temperature (soldering, 10 seconds) — 300 V V/ns W °C/W °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 Definition Min. Max. VS +13.0 VS +20 VB High side floating supply voltage VS High side floating supply offset voltage note 2 600 VPO Digital PWM output voltage COM VCC VCC Low side and logic fixed supply voltage 9.5 20 VIN Input voltage between VIN+ and VIN- -260 +260 TA Ambient temperature -40 125 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 Definition VIN Nominal input voltage range before saturation Min. Typ. Max. Units Test Conditions -260 — 260 |VIN+ _ VIN-| mV Input offset voltage -10 0 10 Input offset voltage temperature drift — 25 — µV/oC 157 162 167 %/V Gain temperature drift — 20 — ppm/ oC Offset supply leakage current — — 50 µA IQBS Quiescent VBS supply current — 1 2 IQCC Quiescent VCC supply current — — 1 LIN Linearity (duty cycle deviation from ideal linearity — 0.5 1 % Linearity temperature drift — .005 — %/ oC Output sink current 20 — — mA 2 — — VOS ∆ VOS/ ∆T A G Gain (duty cycle % per VIN) VIN = 0V (Note 1) max gain error=5% (Note 2) ∆ G/ ∆ T A ILK mA VB = VS = 600V VS = 0V curve) ∆LIN / ∆TA IO- VO = 1V VO = 0.1V 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 Min. Typ. Max. Units Test Conditions Carrier frequency output — 40 — kHz Temperature drift of carrier frequency — 500 — ppm/oC Minimum duty — 7 — % VIN+=-260mV,VIN-=0 % VIN+=+260mV,VIN-=0 Maximum duty — 93 — figure 1 VIN = 0V & 5V BW fo bandwidth 15 kHz VIN+=100mV pk-pk sine wave, -3dB PHS Phase shift at 1kHz -10 o VIN+=100mVpkpk sine wave www.irf.com 3 ADVANCE INFORMATION IR2171 Timing Waveforms Duty=7% Vin+= -260mV Vin- = 0V PO Duty=93% Vin+= +260mV Vin- = 0V PO 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 Low side and logic supply voltage COM Low side logic ground VIN+ Positive sense input VIN- Negative sense input VB High side supply VS High side return PO Digital PWM output N.C. No connection Lead Assignment 1 VCC VIN+ 8 1 VCC VIN+ 8 2 PO VIN- 7 2 PO VIN- 7 3 COM VB 6 3 COM VB 6 4 NC VS 8 lead SOIC IR2171S 5 4 NC VS 1 NC NC 16 2 NC NC 15 3 VCC VIN+ 14 4 PO VIN- 13 5 COM VB 12 6 NC VS 11 7 NC NC 10 8 NC NC 9 5 8 lead PDIP IR2171 16 lead SOIC IR21716S www.irf.com 5 IR2171 ADVANCE INFORMATION Case Outline 8 Lead SOIC 8 Lead PDIP 6 (MS-012AA) 01-0021 09 01-3003 01 www.irf.com ADVANCE INFORMATION 16 Lead SOIC (wide body) IR2171 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