ISO7740 datasheet(34/52 Pages) TI2

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DUT

Vcc 2

Vcc 1

GND 1

GND 2

Oven at 150°C

Time Counter

> 1mA

Figure 8-6. Test Setup for Insulation Lifetime Measurement

1.E+01

1.E+02

1.E+03

1.E+04

1.E+05

1.E+06

1.E+07

1.E+08

1.E+09

1.E+10

1.E+11

1.E+12

200

1200

2200

3200

4200

5200

6200

50 %

Applied Voltage (VRMS)

54 Yrs

36 Yrs

Operating Zone

VDE Safety

Margin Zone

TDDB Line (<1 ppm Fail Rate)

20%

Working Isolation Volatage = 1500 VRMS

up to 150°C

Protected Insulation Lifetime = 36 Years

Applied Voltage Frequency = 60 Hz

Figure 8-7. Insulation Lifetime Projection Data

8.3 Power Supply Recommendations

To help provide reliable operation at data rates and supply voltages, a 0.1-μF bypass capacitor is recommended

at the input and output supply pins (VCC1 and VCC2). The capacitors must be placed as close to the supply

pins as possible. If only a single primary-side power supply is available in an application, isolated power can

be generated for the secondary-side with the help of a transformer driver such as Texas Instruments' SN6501

or SN6505A . For such applications, detailed power supply design and transformer selection recommendations

are available in SN6501 Transformer Driver for Isolated Power Supplies data sheet or SN6505A Low-Noise 1-A

Transformer Drivers for Isolated Power Supplies data sheet .

ISO7740, ISO7741, ISO7742

SLLSEP4J – MARCH 2016 – REVISED OCTOBER 2024

www.ti.com

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