2EDN8523GXTMA1

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2EDN8523GXTMA1 Application Field and Working Principle

The 2EDN8523GXTMA1 is a part from Power Management IC (PMIC) and Gate Drivers product line. It is used as a PWM switch in AC/DC switching power supply applications. The device is designed to work as a regulated power supply and operate as a variable-voltage level converter, providing a high power supply efficiency.

Description of the Device

2EDN8523GXTMA1 is a high-efficiency, low-saturation, low-power device featuring a single-pole, double-throw (SPDT) PWM switch operating at 1 kHz. It has a PWM input/output isolated by an optically-coupled level shifter, providing isolation while controlling the high power switch. The maximum input voltage is 135V, and the maximum output voltage is 110.5V.

The 2EDN8523GXTMA1 includes a current limited switch for thermal protection and minimizes the need for external power supply components. It has an active quiescent current of less than 200 µA and an exceptionally low quiescent current of only 6µA. The device features overvoltage protection (up to 135 V) and reverse polarity protection.

Working Principle of 2EDN8523GXTMA1

The 2EDN8523GXTMA1 is interfaced to the system firmware through the PWM input. When activated, the device operates as a switch across the system voltage lines. It is designed to transfer power from low voltage, noisy AC inputs such as wall-warts, USB ports and other regulated DC sources. A typical application circuit is shown in Figure 1.

The application circuit has two main components – the PWM input and the AC/DC switch. The PWM input is used to control the switch, which can be opened and closed depending on the duty cycle. When the PWM is low, the switch is open and power is not supplied. When the PWM is high, the switch is closed and power is supplied to the load. To minimize power dissipation, the switch is closed for less than 10 ns. When the PWM is low and the switch is open, the output voltage is significantly lower than the input voltage.

The current limited switch also protects the device from overtemperature and high current surges. In normal operation, the output voltage is automatically regulated using the closed loop feedback circuit. This feature reduces the need for additional components as the device can automatically optimize the system voltage output level. The over-voltage protection feature ensures that the output voltage can never exceed the maximum input voltage. Finally, the reverse polarity protection feature ensures that the device is not damaged if the power is supplied in the wrong polarity.

Conclusion

To sum up, the 2EDN8523GXTMA1 is a high-efficiency, low-saturation, low-power PWM switch designed to work as a regulated power supply and operate as a variable-voltage level converter. It operates at a fixed frequency of 1 kHz and has an active quiescent current of less than 200 µA. It features overvoltage protection and reverse polarity protection and has been designed with a current limited switch for thermal protection and minimizes the need for external power supply components. The device has been designed for use with low voltage, noisy AC inputs such as wall-warts, USB ports and other regulated DC sources.

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