8.4 Device Functional Modes

8.4.1 Active-Schottky Diode

For a short period of time, when the input voltage is applied, but the inverter is not yet working, the output

capacitor is charged positive by the load. To prevent the output being pulled above GND, a Schottky diode must

be added in parallel to the output. The function of this diode is integrated into the TPS6040x devices, which

gives a defined startup performance and saves board space.

A current sink and a diode in series can approximate the behavior of a typical, modern operational amplifier.

Figure 8-2 shows the current into this typical load at a given voltage. The TPS6040x devices are optimized to

start into these loads.

TPS60400

C1-

C1+

5

3

OUT

IN

GND

1

2

4

CI

1 µF

CO

1 µF

C(fly)

1 µF

Typical

Load

IO

VO (-VI)

+V

-V

VI

GND

Figure 8-2. Typical Load

60 mA

25 mA

0.4 V 1.25 V

5 V

Load Current

Voltage at the Load

0.4 V

Figure 8-3. Maximum Start-Up Current

TPS60400, TPS60401, TPS60402, TPS60403

SLVS324C – JULY 2001 – REVISED OCTOBER 2020

www.ti.com

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