RT7204E datasheet(32/45 Pages) RICHTEK

32 / 45 page

RT7204E

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

RT7204E_DS-00

May 2024

15.8

I2C Communication

In multi-port applications, the RT7204E can share the output power through I2C communication by connecting

GPIO1 (SDA) and GPIO2 (SCL) to the other master controller, respectively.

15.9

Rectification Detection

The RT7204E provides the VTR pin to sense the transformer voltage, which is the drain voltage of the SR MOSFET,

as shown in Figure 6. By connecting the drain of SR MOSFET to the VTR pin through a divider resistor, the

RT7204E can keep the divided voltage of SR VDS plateau and read the internal peak holding voltage, VVTR_PH,

by ADC for VIN detection. With a proper setting of VTR blanking time, the RT7204E can distinguish between the

PWM switching and the DCM ringing to prevent false detection of the PWM switching state, which is used to

achieve LPS protection.

VTR

RVTR_L

VVTR_EDGE

RVTR_H

VDS_SR

VTR_OL

11-bit

ADC

MCU

VOUT

GND

tVTR_L_BLK

SR Controller

VIN Detection

PWM Switching Detection

VTR_I

Peak Holding Circuit

VVTR_PH

VTR_RST

Figure 6. Rectification Detection

RT7204E Datasheet(PDF) 32 Page - Richtek Technology Corporation