TMUX7348F datasheet(45/60 Pages) TI

45 / 60 page

10.2.1 Design Requirements

Table 10-1. Design Parameters

PARAMETER

VALUE

Positive supply (VDD) mux

+15 V

Negative supply (VSS) mux

−15 V

Positive fault voltage supply (VFP) mux and ADC

+10 V

Negative fault voltage supply (VFN) mux and ADC

−10 V

Power board supply voltage

24 V

Input or output signal range non-faulted

−10 V to 10 V

Overvoltage protection levels

−60 V to 60 V

Control logic thresholds

1.8 V compatible, up to 44 V

Temperature range

−40°C to +125°C

10.2.2 Detailed Design Procedure

The previous image shows the case where an incorrect wiring condition occurred and one of the input

connectors shorted to the power board supply voltage. If the board supply voltage is higher than the fault voltage

supply of the multiplexer, then the TMUX7348F or TMUX7349F will disconnect the source input from passing

the signal to protect the downstream ADC. The drain pin of the mux will be pulled up to the fault voltage supply

voltage VFP through a 40 kΩ resistor to allow the ADC to determine a fault condition has occurred.

10.2.3 Application Curves

The previous example shows how the fault protection of the TMUX7348F or TMUX7349F is utilized to protect

downstream components from damage due to wiring the connections incorrectly from the power module. Figure

10-2 shows an example of positive overvoltage fault response with a fast fault ramp rate of 58 V/µs. Figure

10-3 shows the extremely flat on-resistance across source voltage while operating within a common signal

range of ±10 V. These features make the TMUX7348F or TMUX7349F an ideal solution for factory automation

applications that can face various fault conditions but also require excellent linearity and low distortion.

Time (

s)

0.3

0.6

0.9

1.2

1.5

1.8

2.1

2.4

2.7

-5

-2.5

2.5

7.5

12.5

17.5

22.5

FF/SF

DRAIN

VFP

SOURCE

50 V/

s Fault Ramp

Figure 10-2. Positive Overvoltage Response

VS or VD - Source or Drain Voltage (V)

-10

-6

-2

160

170

180

190

200

210

220

230

240

VDD = 13.5 V, VSS = -13.5 V

VDD = 15 V, VSS = -15 V

VDD = 16.5 V, VSS = -16.5 V

VDD = 18 V, VSS = -18 V

VDD = 20 V, VSS = -20 V

VDD = 22 V, VSS = -22 V

Figure 10-3. RON Flatness in Non-Fault Region

www.ti.com

TMUX7348F, TMUX7349F

SCDS400A – MARCH 2022 – REVISED NOVEMBER 2022

Submit Document Feedback

Product Folder Links: TMUX7348F TMUX7349F

TMUX7348F датащи(PDF) 45 Page - Texas Instruments

TMUX7348F датащи(HTML) 45 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

датащи скачать

ссылки URL