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target specification this is preliminary information on a new product foreseen to be developed. details are subject to change without notice. march 2007 rev 1 1/18 18 TSC101 high side current sense amplifier features independent supply and input common-mode voltages wide common-mode operating range: 2.8 to 30v wide common-mode surviving range: -0.3 to 60v (load-dump) wide supply voltage range: 4 to 28v low current consumption: i cc max = 300a internally fixed gain: 20v/v, 50v/v or 100v/v buffered output applications battery chargers automotive current monitoring notebook computers dc motor control precision current sources description the TSC101 measures a small differential voltage on a high-side shunt resistor and translates it into a ground-referenced output voltage. the gain is internally fixed. wide input common-mode voltage range, low quiescent current, and tiny sot23 packaging enable use in a wide variety of applications. input common-mode and power supply voltages are independent. common-mode voltage can range from 2.8v to 30v in operating conditions and up to 60v in absolute maximum ratings. current consumption lower than 300a and wide supply voltage range allow to connect the power supply to either side of the current measurement shunt with minimal error. l sot23-5 (plastic package) 2 1 3 v p ou t gnd 4 5 vm vcc pin connections (top view) www.st.com
contents TSC101 2/18 contents 1 application schematic and pin d escription . . . . . . . . . . . . . . . . . . . . . . 3 2 absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 common mode rejection ratio (cmr) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 supply voltage rejection ratio (svr) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 gain (av) and input offset voltage (v os ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 output voltage drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 output voltage accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 output voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
TSC101 application schematic and pin description 3/18 1 application schematic and pin description the TSC101 high-side current-sense amplifier features a 2.8v to 30v input common-mode range that is independent of supply voltage. the main advantage of this feature is to allow high-side current sensing at voltages much greater than the supply voltage (v cc ). figure 1. application schematic ta bl e 1 below describes the function of each pin. their position is shown in the illustration on the cover page and in figure 1 above. table 1. pin description symbol type function out analog output the out voltage is proportional to the magnitude of the sense voltage v p -v m . gnd power supply ground line. v cc power supply positive power supply line. v p analog input connection for the external sense resistor. the measured current enters the shunt on the v p side. v m analog input connection for the external sense resistor. the measured current exits the shunt on the v m side. v sense v out =av.v sense 4 3 1 2 vp vm out gnd 5 v cc load i load 2.8v to 30v rg1 rg2 rg3 r sense
absolute maximum ratings and operating conditions TSC101 4/18 2 absolute maximum ratings and operating conditions table 2. absolute maximum ratings symbol parameter value unit v id input pins differential voltage (v p -v m )60v v i input pin voltages (v p , v m ) (1) 1. voltage values are measured with respect to the gnd pin. -0.3 to 60 v v cc dc supply voltage (1) -0.3 to 30 v v out dc output pin voltage (1) -0.3 to 28 v t stg storage temperature -55 to 150 c t j maximum junction temperature 150 c esd (2) 2. esd test for each couple of pins. human body model (hbm) 2 kv machine model (mm) 200 v table 3. operating conditions symbol parameter value unit v cc dc supply voltage from t min to t max 4.0 to 28 v t oper operational temperature range (t min to t max ) -40 to 125 c r thja sot23-5 thermal resistance ju nction to ambient 250 c/w
TSC101 electrical characteristics 5/18 3 electrical characteristics the electrical characteristics given in the following tables are measured under the following test conditions unless otherwise specified: t amb =25c, v cc =12v, v sense =v p -v m =50mv, v m =12v, no load on out table 4. supply symbol parameter test conditions min. typ. max. unit i cc total supply current v sense = 0 t min < t amb < t max 300 a table 5. input symbol parameter test conditions min. typ. max. unit v icm common mode voltage range t min < t amb < t max 2.8 30 v dc cmr dc common mode rejection variation of v out versus v icm referred to input (1) 2.8v< v icm < 30v t min < t amb < t max 90 105 db ac cmr ac common mode rejection variation of v out versus v icm referred to input (peak-to-peak voltage variation) 2.8v< v icm < 30v 1khz sine wave 95 db 2.8v< v icm < 30v 10khz sine wave 80 db svr supply voltage rejection variation of v out versus v cc (2) 4.0v< v cc < 28v v sense =30mv t min < t amb < t max 90 105 db v os input offset voltage (3) t amb =25 c t min < t amb < t max 0.2 0.9 1.5 2.3 mv dv os /dt input offset drift vs. t t min < t amb < t max 0 4.5 v/c i lk input leakage current v cc =0v t min < t amb < t max 1a i ib input bias current v sense =0v t min < t amb < t max 5.5 8 a 1. see section 4: parameter definitions on page 8 for the definition of cmr. 2. see section 4: parameter definitions on page 8 for the definition of svr. 3. see section 4: parameter definitions on page 8 for the definition of v os .
electrical characteristics TSC101 6/18 table 6. output symbol parameter test conditions min. typ. max. unit av gain TSC101a TSC101b TSC101c 20 50 100 v/v av gain accuracy t amb =25c t min < t amb < t max 3 5 % v out / t output voltage drift vs. t (1) t min < t amb < t max -600 -300 0 v/c v out / i out output stage load regulation -10ma < i out <1 0ma i out sink or source current 2tbdmv/ma v out total output voltage accuracy (2) v sense =10mv t amb =25 c t min < t amb < t max tbd tbd % v out total output voltage accuracy v sense =20mv t amb =25 c t min < t amb < t max tbd tbd % v out total output voltage accuracy v sense =50mv t amb =25 c t min < t amb < t max tbd tbd % v out total output voltage accuracy v sense =100mv t amb =25 c t min < t amb < t max tbd tbd % i sc short-circuit current out connected to v cc or gnd 15 40 ma v oh output stage high-state saturation voltage v oh =v cc -v out v sense =1v i out =1ma 0.8 1 v v ol output stage low-state saturation voltage v sense =-1v i out =1ma 50 100 mv 1. see section 4: parameter definitions on page 8 for the definition of output voltage drift versus temperature. 2. output voltage accuracy is the difference with the expected theoretical output voltage v out-th =av*v sense . see section 4: parameter definitions on page 8 for a more detailed definition.
TSC101 electrical characteristics 7/18 table 7. frequency response symbol parameter test conditions min. typ. max. unit ts output settling to 1% final value v sense =10mv to 100mv, c load =47pf TSC101a 3 s TSC101b 6 s TSC101c 10 s sr slew rate v sense =10mv to 100mv 0.55 0.9 v/s bw 3db bandwidth c load =47pf v icm =12v v sense =100mv TSC101a 650 khz TSC101b 710 khz TSC101c 540 khz table 8. noise symbol parameter test conditions min. typ. max. unit total output voltage noise 50 nv/ hz
parameter definitions TSC101 8/18 4 parameter definitions common mode rejection ratio (cmr) the common-mode rejection ratio (cmr) meas ures the ability of the current-sensing amplifier to reject any dc voltage applied on both inputs v p and v m . the cmr is referred back to the input so that its effect can be compared with the applied differential signal. the cmr is defined by the formula: supply voltage rejection ratio (svr) the supply-voltage rejection ratio (svr) me asures the ability of the current-sensing amplifier to reject any variat ion of the supply voltage v cc . the svr is referred back to the input so that its effect can be compared with the applied differential signal. the svr is defined by the formula: cmr 20 ? v out v icm av ? ------------------------------ log ? = svr 20 ? v out v cc av ? ----------------------------- - log ? =
TSC101 parameter definitions 9/18 gain (av) and input offset voltage (v os ) the input offset voltage is defined as the intersection between the linear regression of v out vs. v sense curve with the x-axis (see figure 2 ). if v out1 is the output voltage with v sense =v sense1 =50mv and v out2 is the output voltage with v sense =v sense2 =5mv, then v os can be calculated with the following formula: the amplification gain av is defined as the ratio between output voltage and input differential voltage: figure 2. v out versus v sense characteristics: detail for low v sense values v os v sense1 v sense1 v sense2 ? v out1 v out2 ? ----------------------------------------------- - v out1 ? ?? ?? ? = av v out v sense ----------------- - = v0 5mv 50mv v sense v out
parameter definitions TSC101 10/18 output voltage drift versus temperature the output voltage drift versus temperature is defined as the maximum variation of v out with respect to its value at 25c, over the temperature range.it is calculated as follows: with t min < t amb < t max . figure 3 provides a graphical definition of output voltage drift versus temperature. on this chart, v out is always comprised in the grey area defined by the maximum and minimum variation of v out vs. t, and t=25c is considered to be the reference. figure 3. output voltage drift versus temperature v out t ---------------- -max v out t amb () v out 25 c () ? t amb 25 c ? -------------------------------------------------------------------------- = output voltage drift vs. temperature 4.44 4.46 4.48 4.5 4.52 4.54 4.56 4.58 -50 -25 0 25 50 75 100 125 temperature (c) v out (v)
TSC101 parameter definitions 11/18 output voltage accuracy the output voltage accuracy is the difference between the actual output voltage and the theoretical output voltage. ideally, the current sensing output voltage should be equal to the input differential voltage multiplied by the theoretical gain, as in the following formula: v out-th =av . v sense the actual value is very slightly different, mainly due to the effects of: the input offset voltage v os , non-linearity, v ol and v oh voltage saturation (see figure 5 on page 12 ) figure 4. v out vs. v sense theoretical and actual characteristics the output voltage accuracy, expressed in percentage, can be calculated with the following formula: with av=20v/v for TSC101a, av=50v/v for TSC101b and av=100v/v for TSC101c. v sense v out 5mv ideal actual v out abs v out av v sense ? () ? () av v sense ? -------------------------------------------------------------------------- - =
parameter definitions TSC101 12/18 output voltage range the output voltage versus input differential voltage is linear in a range of output voltage limited by high-level and low-level saturation voltage. figure 5. v out vs. v sense over the full voltage range v sense v out v cc v oh v ol
TSC101 application information 13/18 5 application information TSC101 can be used to measure current and to feed back the information to a micro controller, as shown in figure 6 below. figure 6. typical application schematic the current from the supply flows to the load through the r sense resistor causing a voltage drop equal to v sense across r sense . the amplifier input currents are negligible, therefore its inverting input voltage is equal to v m . the amplifier's open-loop gain forces its non-inverting input to the same volt age as the inverting input. as a consequence, the am plifier will adjust current flowing throu gh rg1 so that the voltage drop across rg1 will exactly match v sense . therefore, the drop across rg1 is: v rg1 =v sense =r sense .i load if i rg1 is the current flowing through rg1, then i rg1 is given by the formula: i rg1 =v sense /rg1 the i rg1 current flows entirely into resistor r g3 (the input bias current of the buffer is negligible). therefore, the voltage drop on the r g3 resistor can be calculated as follows: v rg3 =r g3 .i rg1 =(r g3 /r g1 ).v sense 5v v sense v out load i load 2.8v to 30v r sense v reg vp v out gnd v cc r g 1r g 2 r g 3 TSC101 microcontroller adc gnd v cc
application information TSC101 14/18 because the voltage across the r g3 resistor is buffered to the out pin, v out can be expressed as: v out =(r g3 /r g1 ).v sense or v out =(r g3 /r g1) .r sense .i load the resistor ratio r g3 /r g1 is internally set to 20v/v for TSC101a, to 50v/v for TSC101b and to 100v/v for TSC101c. because they define the full scale output range of your application, the r sense resistor and the r g3 /r g1 resistor ratio (equal to av) are important parameters, and therefore must be selected carefully.
TSC101 package information 15/18 6 package information in order to meet environmental requirements, stmicroelectronics 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. th e maximum ratings re lated to soldering conditions are also marked on the inner box label. ecopack is an stmicroelectronics trademark. ecopack specifications are available at: www.st.com . figure 7. sot23-5 package ref. dimensions millimeters mils min. typ. max. min. typ. max. a 0.90 1.45 35.4 57.1 a1 0.00 0.15 0.00 5.9 a2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 c 0.09 0.20 3.5 7.8 d 2.80 3.00 110.2 118.1 e 2.60 3.00 102.3 118.1 e1 1.50 1.75 59.0 68.8 e 0.95 37.4 e1 1.9 74.8 l 0.35 0.55 13.7 21.6
ordering information TSC101 16/18 7 ordering information table 9. order codes part number temperature range package packaging marking gain TSC101ailt -40c, +125c sot23-5 tape & reel o104 20 TSC101bilt o105 50 TSC101cilt o106 100 TSC101aiylt (1) -40c, +125c automotive grade sot23-5 tape & reel o101 20 TSC101biylt (1) o102 50 TSC101ciylt (1) o103 100 1. qualified and characterized accordi ng to aec q100 and q003 or equivalent, advanced screening according to aec q001 & q 002 or equivalent.
TSC101 revision history 17/18 8 revision history date revision changes 5-mar-2007 rev 1 first release, preliminary data.
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