RT7791P
PWM Controller for Programmable Power Converter (USBPD)
General Description
The RT7791P series is specifically designed to work
with controllers, such as the RT7202, so as to provide a
total solution for the USB PD or a programmable power
adapter. The RT7791P can achieve high efficiency,
meet safety standards, and consume less than 50mW
of power in a 5V standby condition.
The RT7791P possesses several innovations in
system control, by which the RT7791P can therefore
allow one to design a power a solution with a wide
range of output voltage. One of the innovations is by
using the DMAG pin, the RT7791P senses output
voltage to adjust loop gain for system stability, to adjust
output over-voltage protection threshold voltage for
external devices protection, and to adjust current limit
for Limited Power Source (LPS) safety requirements.
The RT7791P is also equipped with comprehensive
protection features, including Bulk-Capacitor 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). In case
for constant output power regulation, a resistor
connected to CS pin can be used to achieve accurate
line compensation across the universal input voltage
range. Moreover the RT7791P moreover provides
various features to protect against failures occurring at
the secondary-side component, such as the RT7202 or
a shunt regulator.
In applications, the RT7791P is suggested to use with
a Secondary controller RT7202 to realize a robust and
safe design, especially to prevent the potential fault
scenarios, due to the mis-connection of various devices,
cables, plugs and receptacles.
Features
Optimized for Adaptive Output Power
Integrated Low-Dropout Regulator (LDO)
Wide VDD Range : 10V to 40V
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
Bulk-Capacitor Brown-In and Brown-Out
Protection
OTP Pin for External Over-Temperature
Protection
VDD Over-Voltage Protection
Output Over-Voltage and Under-Voltage
Protection
Secondary Rectifier Short-Circuit Protection
Programmable Line Compensation
Others
< 50mW in 5V Standby Mode for Power Saving
Driver Capability : 300mA/300mA
SmartJitter
TM
Technology
Applications
USB PD and Programmable Power Adapters
Simplified Application Circuit
Option
L
VBUS
+
+
1
2
GND
N
RT7202A
VDD
RT7791P
DMAG
OTP
CS
COMP
4
GND
3
GATE
VIN
VDD
(Optional)
GND
CS-
V2
OPTO
VFB
USBP
CC1
Option
CC1
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7791P-02
December 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
