IXI848A High-Side Current Monitor General Description
The IXI848Ais a precision high side current sense monitor. High side power-line monitoring offersthe advantage of allowingthe ground plane to remain undisturbed when sensing load currents.
An external sense resistor sets the range of the amplified ground-referenced output monitoring voltage. The output voltage is amplified by a selectable fixed gain of either 10 or 50. With an input voltage range up to 60V, and output gain of up to 50, the IXI848A is designed to address a wide variety of current sense applications.
The IXI848A operates over a temperature range of -40°C to +85°C. The IXI848A is available in an 8-Lead SOIC package.
• High-Side Current Sense Amplifier • 2.7V to 60V Input Range • 0.7% Typical Full Scale Accuracy • Scalable Output Voltage • SOIC Package
Applications:
• Power Management Systems • Smart Battery Packs • Battery Chargers
• Battery Powered Portable Equipment • DC Motor Control
IXI848A Functional Block Diagram and General Application Circuit
IXI848A SOIC PIN Configuration
GND
12348765R50N/CN/CLOAD
Rs 5LOAD4INRR10
ILVOUT
IN
LOAD-+SOIC-8
310R40RRGRG8GND2VOUTR10R50ZmOrdering Information
Part No. Description Package Quantity
IXI848AS1 SOIC-8 98 (Tube)High Side Current XI848AS1T/RSense Monitor SOIC-8 2500 (T&R) 1
Copyright © IXYS CORPORATION 2005
08/01/05
http://oneic.com/
IXYS IXI848A
Absolute Maximum Ratings Parameter Rating Absolute Maximum Ratings are stress ratings. Stresses in excess of these ratings can cause Voltage to IN (pin 4) -0.3V to +65V permanent damage to the device. Functional Differential Input Voltage (VSENSE) ±0.4V operation of the device at these or any other conditions beyond those indicated in the operational Input Current to any pin ±10mA sections of this data sheet is not implied. Exposure Operating Ambient Temp Range -40°C to +85°C of the device to the absolute maximum ratings for Operating Junction Temp Range -40°C to +125°C an extended period may degrade the device and affect its reliability. θJA 150°C/W θJC 40°C/W Storage Temp Range -65°C to +150°C Lead Temperature (Soldering, 10 sec) +300°C ESD Warning ESD (electrostatic discharge) sensitive device. Although the IXI848A feature proprietary ESD protection circuitry, permanent damage may be sustained if subjected to high energy electrostatic discharges. Proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Electrical Characteristics TA = 25°C, VIN = 2.7V to 40V, unless otherwise noted Parameter Operating Voltage Range Supply Current Full Scale Sense Voltage Input Offset Voltage Full Scale Accuracy Total OUT Voltage Error (Note 1, Note 2) Gain Accuracy (Note 2) Gain Setting Resistance Symbol VINIIN VSENSEVOS Conditions Min Typ Max Unit 2.7 60 V VIN = 20V, VSENSE = 0V, ILOAD = 0A .065 .130 mA 150 mV VIN = 12V VSENSE = 100mV, VIN = 12V TA = +25°C VSENSE = 100mV TA = +25°C VIN = 12V ∆ @ TA = -40° to +85°C VSENSE = 100mV TA = +25°C VIN = 40V ∆ @ TA = -40° to +85°C VSENSE = 20mV TA = +25°C to 100mV ∆ @ TA = -40° to +85°C VIN = 12V, 40V VIN = 12V Gain = 10V/V VSENSE = 100mV Gain = 50V/V -2.0 ±0.5 2.0 mV ±0.7 % 23 115 ±0.7 ±0.3 ±0.8 ±0.4 ±0.5 ±0.1 33 165 43 215 % % % kΩ kΩ RGNote 1: Total OUT voltage error is the sum of gain and offset voltage errors. Note 2: Production Tested at TA =25°C. www.ixys.com
2
08/01/05
http://oneic.com/
Pin Description and Configuration SOIC Name Description Ground 1 GND IXYS IXI848A
2 R10 RConnecting R10 to GND, (R50=N/C) selects a VOUT voltage that is 10X the voltage across SENSE. Output voltage proportional to the voltage across RSENSE. 3 VOUT Positive supply terminal and power connection for the external Sense Resistor. 4 IN Load-side connection to the external Sense Resistor. 5 LOAD No Connect 6 N/C No Connect 7 N/C 8 R50 RConnecting R50 to GND, (R10=N/C) selects a VOUT voltage that is 50X the voltage across SENSE. Detailed Circuit Description The IXI848A is a precision high side current sense monitor featuring an input voltage range of 2.7V to 60V, and a selectable ground referenced fixed gain output of either 10 or 50. A small voltage developed across an external sense resistor (RS), is converted to an amplified ground referenced voltage output at VOUT, (Figure 1). The amplifier’s non-inverting input is high impedance making the voltage at that terminal equal to VIN – (IL) (RS). The amplifier forces the high impedance inverting terminal to equal the non-inverting input voltage by turning on the P-Channel MOS FET. As the P-Channel MOS FET is biased on by the amplifier output, current is sourced through RG (10R or 10R+40R), to produce a voltage equal to VIN – (IL) (RS) at the inverting input of the amplifier. This develops a voltage across the inverting input resistor, R that matches the sense voltage across RS, plus any associated input offset voltage, (VIO). Consequently, the voltage at VOUT corresponds to RG / R. Output: VOUT = G [ (IL) (RS) + VIO ] Gain: G = (RG) (ZM) / R (RG (RG + ZM)) RG = 10R or 50R selectable Temperature coefficient: (all on-chip resistors) R = 700ppm / °C typical RSENSE Component Selection The RSENSE value should be selected such that the voltage across RSENSE is at full-scale for the load current to be monitored. Operating the IXI848A at or near the full-scale sense voltage will minimize the error component associated with the input offset voltage of the internal op amp. The IXI848A can be configured to measure a wide selection of currents by using different RSENSE values. Some common values for typical operation of the IXI848A are listed in the following table. Gain VOUT (V) Full-ScaleRSENSE RS (Ω) (V/V) VSENSE = 150mVIL (A) 0.15 1.0 10 1.5 1.5 0.1 10 1.5 5 0.01 50 2.5 100 0.001 50 5 Output Impedance The VOUT output is a current source driving a 33kΩ resistance to ground for a gain of 10, or a 165kΩ resistance to ground for a gain of 50. Output gain is reduced by resistive loading of the VOUT terminal. The impedance of the external monitor load (ZM) should be chosen high enough to maintain the desired accuracy. Buffering of the VOUT terminal with a high-impedance input stage may be required to minimize output errors. The following formulas quantify the percent error introduced by output loading: For a Gain of 10 %ERROR = 100 [RLOAD / (33kΩ + RLOAD) – 1] For a Gain of 50 %ERROR = 100 [RLOAD / (165kΩ + RLOAD) – 1] RLOAD = the external load applied to VOUT www.ixys.com
3
08/01/05
http://oneic.com/
Typical Performance Characteristics .125.080Vin=20VIXYS IXI848A
Supply Current (mA)51015202530Supply Voltage (Vin)3540Supply Current (mA).105.085.065.045.025.0052.7.075.070.065.060.055.050-40-151035Ta (°C)6085 Fig 3. Supply Current vs. Voltage Fig 4. Supply Current vs. Temperature Gain=10CL=8pFVsense5mV/DivVin=12V100mV95mV1VVout20mV/Div2uS/Div0.95VVout500mV/DivVsense45mV/DivCL=8pFGain=10Vin=12V100mV6mV1V0.06V2uS/Div Fig 5. Small Signal Transient Response 10X Fig 6. Large Signal Transient Response 10X Gain=50CL=8pFVsense5mV/DivVin=12VVsense100mV95mV5VVout100mV/Div10uS/Div4.75VVout2V/Div10uS/Div0.3V45mV/Div6mVCL=8pFGain=50Vin=12V100mV5v Fig 7. Small Signal Transient Response 50X Fig 8. Large Signal Transient Response 50X www.ixys.com
4
08/01/05
http://oneic.com/
IXYS Package Outline IXI848A
8-LEAD SOIC IXYS Corporation makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses nor indemnity are expressed or implied. Except as set forth in IXYS’ Standard Terms and Conditions of Sale, IXYS Corporation assumes no liability whatsoever, and disclaims any expressed or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. www.ixys.com
5
08/01/05
http://oneic.com/
分销商库存信息:
IXYS
IXI848AS1T/R
IXI848AS1
因篇幅问题不能全部显示，请点此查看更多更全内容