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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS2480PW датащи(PDF) 25 Page - Texas Instruments |
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TPS2480PW датащи(HTML) 25 Page - Texas Instruments |
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25 / 60 page  C T R PROG1 R PROG2 R SDA 10kW R SDA 10kW C VS 0.1mF C EN 0.1mF R EN2 SDA SCL 3P3V_USB R EN1 VCC R S R G D1 VCC VOUT C O 1kW C G R PG C 1 0.1mF A0 A1 Optional : Use with dV/dt control I2C Addresses + R B D2 5.1V C2 0.1mF C VIN R MB R IN R MA M1 VIN 9V to 57V TPS2480 TPS2481 www.ti.com SLUS939B – APRIL 2010 – REVISED DECEMBER 2010 High Voltage Application Example The TPS2480/81 can be used to monitor current from a voltage source greater than 26 V by using the OPAMP circuit shown in Figure 19. Figure 19. TPS2480/81 High Voltage Application The basic operating principle of U2, Q1, RMA, and RMB is to mirror the voltage seen across RS from a VCC referenced voltage to a GND referenced voltage. As load current flows through RS, the voltage input to U2-3 decreases and the output of U2/Q1 as seen at Q1-S follows this sense voltage. Ideally, the voltage drop across RMA mirrors the voltage drop across RS. Current flow through RMB will mirror current flow through RMA , and if RMA = RMB then the sense voltage across RS is mirrored at VINP. Since only a small voltage will be across RMA and RMB, their nominal value should be fairly low to offset input bias current effects (IVINP). TPS2480/1 input bias current sums with the current that flows through RMA increasing the voltage drop across RMB. To block the bias current from RMB, an additional buffer may be inserted between Q1-D and VINP. Using a network type resistor for RMA and RMB designed with temperature coefficient tracking will provide good voltage mirroring. U2 should be a high quality, low drift operational amplifier. The OPA333AID provides low input voltage offset and very low drift over time and temperature. U2 is referenced to VCC through D2 and RB and can operate from rail to rail. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 25 Product Folder Link(s): TPS2480 TPS2481 |
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