RT7753GCS
PWM Controller for Programmable Power Converter (USBPD)
General Description
The RT7753GCS series is specifically designed to
work with controllers, such as RT7202, to provide a
total solution for the USB Power Delivery (USB PD) or
a programmable power adapter. This RT7753GCS not
only provides a control scheme of high power efficiency,
but also gives a very low standby power control below
50mW when under the 5V standby condition.
The RT7753GCS is such a special design to achieve a
wide-range of output voltage by utilizing several
innovations, including (1) By using the DMAG pin, the
RT7753GCS senses the output voltage to adjust the
loop gain for system stability, to adjust the threshold
voltage of the output over-voltage protection, to protect
external devices, and to adjust the current limit to meet
Limited Power Source (LPS) safety requirements; (2)
The RT7753GCS 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); (3) For
constant output power regulation, a resistor connected
to CS pin can be used to achieve an accurate line
compensation across the universal input voltage range;
and (4) The RT7753GCS also provides various
features to protect against any failures occurring at the
secondary-side component, such as the RT7202 or a
shunt regulator.
In applications, the RT7753GCS is suggested to use
with a secondary controller RT7202 to realize a robust
and safe design so as to prevent all potential fault
conditions due to misconnection of various devices,
cables, plugs or receptacles.
Features
Optimized for Adaptive Output Power
Wide VDD Range : 9V to 42V
Adaptive Output Over-Voltage Protection
Adaptive Over-Current Protection
Adaptive Loop Gain Control for Loop Stability
High Efficiency
Green Mode Operation at Light Load and No
Load
Comprehensive Protection Features
Bulk-Capacitor 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
< 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
N
2
GND
RT7202A
Option
RT7753GCS
DMAG
GATE
VDD
COMP
4
GND
3
CS
Option
VDD
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.
DS7753GCS-00
May 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
