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TPS2480PW bảng dữ liệu(PDF) 25 Page - Texas Instruments

tên linh kiện TPS2480PW
Giải thích chi tiết về linh kiện  Positive Voltage Intelligent Protection Device Hotswap Controller and I2C Current Monitor
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nhà sản xuất  TI2 [Texas Instruments]
Trang chủ  https://www.ti.com
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TPS2480PW bảng dữ liệu(HTML) 25 Page - Texas Instruments

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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
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Product Folder Link(s): TPS2480 TPS2481



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