RT7786
PWM Controller for Programmable Power Converter (USBPD)
General Description
The RT7786 series is specifically designed to work with
controllers, such as RT7207, so as to provide a total
solution for the USB PD or the programmable power
adapter. The RT7786 is able to achieve the high
efficiency performance, meet safety standards, and
consume low standby power, which is normally less
than 30mW in a 5V standby condition.
The RT7786 offers several innovative features so as to
provide a solution having an output voltage of
wide-range. By using the DMAG pin, the RT7786
senses output voltages to adjust the loop gain for
system stability, to adjust the threshold voltage of
output over-voltage for external device protection, and
to adjust the current limit to meet Limited Power Source
(LPS) safety requirements.
The RT7786 is also equipped with comprehensive
protection features, including brown-in/brown-out
protection, VDD over-voltage protection (VDD OVP),
output over-voltage/under-voltage protection (Output
OVP/UVP), secondary rectifier short-circuit protection
(SRSP), and external over-temperature protection
(External OTP). For applications with constant output
power regulation, a resistor connected to CS pin can be
used to achieve the accurate line compensation across
the universal input voltage range. The RT7786 also
provides various features to protect against failures
occurring at the secondary-side component, such as
the RT7207 or a shunt regulator.
The RT7786 and the RT7207 can be used together to
realize a robust and safe design preventing all potential
fault scenarios, due to versatile and unknown
connections of various devices, cables, plugs and
receptacles.
Features
Optimized for Adaptive Output Power
Wide VDD Range : 10V to 32V
Adaptive Output Over-Voltage Protection
(Except RT7786xA and RT7786LCA)
Adaptive Over-Current Protection
Adaptive Loop Gain Control for Loop-Stability
High Efficiency
Green Mode Operation at Light Load or No
Load
Comprehensive Protection Features
Brown-In and Brown-Out Protection
VDD Over-Voltage Protection
Output Over-Voltage and Under-Voltage
Protection
External Over-Temperature Protection
Secondary Rectifier Short-Circuit Protection
Programmable Line Compensation
Others
< 30mW in 5V Standby Mode for Power Saving
Driver Capability : 300mA/300mA
SmartJitter
TM
Technology
Applications
USB PD and Programmable Power Adapters
Simplified Application Circuit
V
OUT
+
+
AC Mains
GND
Option
Option
CC1
VDD
CS-
AGND
V2
GND
BLD USBP
CC1
+
RT7207C
DMAG VDD
HV
RT7786
COMP
GND
CS
GATE
Option
OPTO
IFB
VFB V5
VCP
V9 CC_GND CC2
CC2
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7786-04
March 2020
www.richtek.com
1
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