TMUX7348F datasheet(45/59 Pages) TI

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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 / 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 image shows the case where an incorrect wiring condition occurred and one of the input connectors has

been 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 example application utilizes the fault protection of the TMUX7348F or TMUX7349F to protect downstream

components from potential miswiring conditions from the Power Module board. 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 may 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

50V/

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

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TMUX7348F

SCDS400 – MARCH 2022

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