TPL0102 datasheet(32/48 Pages) TI2

tên linh kiện	TPL0102

Giải thích chi tiết về linh kiện	TPL0102 Two 256-Taps Digital Potentiometers With Non-Volatile Memory

PDF	48 Pages

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32 / 48 page

set

LOAD

set

200

Vcc

TPL0102

OPA317

1 nF

10 k

1.2 k

Vcc

150 k

Vcc

Load+

Load-

RLOAD

TPL0102

Vset

Rset

ILOAD

Voltage

Divider

Mode

Rheostat Mode

TPL0102

SLIS134C – MARCH 2011 – REVISED SEPTEMBER 2015

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Product Folder Links: TPL0102

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8.2.3 Variable Current Sink

Figure 35. Variable Current Sink Schematic

8.2.3.1 Design Requirements

DESIGN PARAMETER

EXAMPLE VALUE

Load Current Range

0 µA to 1.33 mA

8.2.3.2 Detailed Design Procedure

Both potentiometers within the TPL0102 can be used with an OPA317 op amp and N-Channel MOSFET to

produce a variable current sink. The first potentiometer, configured in voltage divider mode, is used to set the

input voltage to the OPA317. The second potentiometer, configured in rheostat mode, is used to set the span of

the current (ILOAD) running through RLOAD. The load current for the circuit is shown below:

(13)

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