 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| TSC888 Low cost high-side current sense amplifier Features Independent supply and input common-mode voltages Wide common-mode operating range: 2.8 V to 24 V Wide supply voltage range: 4 to 24 V Low current consumption: ICC max = 1 mA Internally fixed gain: 20 V/V, 50 V/V or 100 V/V Buffered output Pin connections (top view) L SOT23-5 (Plastic package) Applications Desktop computers and servers SMPS Photovoltaic/solar systems Battery chargers Notebook computers DC motor control Gnd 2 Vp 3 4 Vm Out 1 5 Vcc Description The TSC888 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 SOT23-5 packaging make the TSC888 ideal for use in a wide variety of applications. Input common-mode and power supply voltages are independent. Common-mode voltage can range from 2.8 V to 24 V in operating conditions. Current consumption lower than 1 mA and wide supply voltage range allow to connect the power supply to either side of the current measurement shunt with minimal error. June 2008 Rev 1 1/7 www.st.com 7 Application schematics and pin description TSC888 1 Application schematics and pin description The TSC888 high-side current-sense amplifier features a 2.8 V to 24 V 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 (VCC). The TSC888 can therefore be supplied by a 5 Vsb line and monitor a 3.3 V, 5 V or 12 V power line. Considering the wide supply voltage operating range (4 V to 24 V) another option available in most cases is to connect the VCC pin to the Vp pin. Figure 1. Application schematics Vsense Iload 12V, 5V or 3.3V line Main PWM controller 5Vsb Vp Vm TSC888 Vcc Out Monitoring device Stand-by PWM controller Gnd Vout=Vsense.Av Table 1 describes the function of each pin. Their position is shown in the illustration on the cover page and in Figure 1 above. Table 1. Symbol Out Gnd Vcc Vp Vm Pin description Type Analog output Power supply Power supply Analog input Analog input Function The out voltage is proportional to the magnitude of the sense voltage Vp-Vm. Ground line. Positive power supply line. Connection for the external sense resistor. The measured current enters the shunt on the Vp side. Connection for the external sense resistor. The measured current exits the shunt on the Vm side. 2/7 TSC888 Absolute maximum ratings and operating conditions 2 Absolute maximum ratings and operating conditions Table 2. Symbol Vid Vin VCC Vout Tstg Tj Rthja ESD Machine model (MM) Absolute maximum ratings Parameter Input pins differential voltage (Vp-Vm) Input pin voltages (Vp, Vm) DC supply voltage (1) (1) Value 2 -0.3 to 30 -0.3 to 25 -0.3 to Vcc -55 to 150 150 250 1 100 Unit V V V V C C C/W kV V DC output pin voltage(1) Storage temperature Maximum junction temperature SOT23-5 thermal resistance junction to ambient Human body model (HBM)(2) (3) 1. Voltage values are measured with respect to the Gnd pin. 2. Human body model: 100 pF discharged through a 1.5k resistor between two pins of the device, done for all couples of pin combinations with other pins floating. 3. Machine model: a 200 pF cap is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 ), done for all couples of pin combinations with other pins floating. Table 3. Symbol VCC Toper Vicm Operating conditions Parameter DC supply voltage from Tmin to Tmax Operational temperature range (Tmin to Tmax) Common mode operating range Value 4.0 to 24 -40 to 85 2.8 to 24 Unit V C V 3/7 Electrical characteristics TSC888 3 Electrical characteristics The electrical characteristics given in the following tables are measured under the following test conditions unless otherwise specified: Tamb=25C, Vcc=5V, Vsense=Vp-Vm=50mV, Vm=12V, no load on Out Table 4. Symbol ICC Supply Parameter Total supply current Test conditions Vsense = 0 Min. Typ. Max. 1 Unit mA Table 5. Symbol Input Parameter DC common mode rejection Variation of Vout versus Vicm referred to input Supply voltage rejection Variation of Vout versus Vcc referred to input Input leakage current Input bias current Test conditions 2.8V< Vicm < 24V Vsense= 30mV 4.0V< VCC < 24V Vsense= 30mV Vcc=0V Vsense=0V 5.5 Min. Typ. Max. Unit CMR 95 dB SVR Ilk Iib 95 1 8 dB A A Table 6. Symbol Av Vout Isc Output Parameter Gain Total output voltage accuracy Short-circuit current Output stage high-state saturation voltage VOH=VCC-Vout Output stage low-state saturation voltage OUT connected to VCC or GND Vsense=1V Iout=1mA Vsense=-1V Iout=1mA 2 Test conditions TSC888A TSC888B TSC888C Min. Typ. 20 50 100 6 Max. Unit V/V % mA VOH 0.8 1 V VOL 50 100 mV 4/7 TSC888 Package information 4 Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) 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. The maximum ratings related 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 2. SOT23-5 package mechanical drawing Table 7. SOT23-5 package mechanical data Dimensions Ref. Min. A A1 A2 b C D E E1 e e1 L 0.35 0.90 0.00 0.90 0.35 0.09 2.80 2.60 1.50 Millimeters Typ. Max. 1.45 0.15 1.30 0.50 0.20 3.00 3.00 1.75 0.95 1.9 0.55 13.7 Min. 35.4 0.00 35.4 13.7 3.5 110.2 102.3 59.0 Mils Typ. Max. 57.1 5.9 51.2 19.7 7.8 118.1 118.1 68.8 37.4 74.8 21.6 5/7 Ordering information TSC888 5 Table 8. Ordering information Order codes Temperature range Package Packaging Marking O111 -40C, +85C SOT23-5 Tape & reel O112 O113 Order code TSC888AILT TSC888BILT TSC888CILT Gain 20 50 100 6 Table 9. Date Revision history Document revision history Revision Rev 1 Initial release. Changes 26-Jun-2008 6/7 TSC888 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 7/7 |
Price & Availability of TSC888
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |