®
RT7736
SmartJitter
TM
PWM Flyback Controller
General Description
The RT7736 series is a high performance enhanced PWM
flyback controller with proprietary SmartJitter
TM
technology.
The innovative SmartJitter
TM
technology not only reduces
EMI emissions of SMPS when the system enters burst
switching green mode, but also eliminates output jittering
ripple.
The RT7736 is a current mode PWM controller including
built-in slope compensation, internal Leading Edge
Blanking (LEB) and cycle-by-cycle current limit. It provides
excellent green power performance, especially under light
load and no load conditions. It allows for simpler design
and reduces external component count.
This controller integrates comprehensive safety protection
functions for robust designs including input Under-Voltage
Lockout (UVLO), Over-Voltage Protection (OVP), Over-
Load Protection (OLP), Secondary Rectifier Short
Protection (SRSP), CS pin open protection and cycle-by-
cycle current limit.
The RT7736 is a cost-effective and compact solution for
NB adaptor applications. It is available in the SOT-23-6
package.
Features
Proprietary SmartJitter
TM
Technology
½
Reducing
EMI Emissions of SMPS
½
Output Jittering Ripple Elimination
No Load Input Power Under 100mW (RT7736G/R/L/E)
Accurate Over Load Protection
UVLO 9V/14.5V
PRO Pin for External Arbitrary OVP/OTP
IC ON/OFF Control (RT7736G/R/L)
BNO Pin for Brown-In/Out (RT7736B/F)
Soft Driving for EMI Noise Reduction
Driver Capability : 300mA/−300mA
−
High Noise Immunity
RoHS Compliant and Halogen Free
Applications
Switching AC-DC Adaptor
DVD Open Frame Power Supply
Set-Top Box (STB)
ATX Standby Power
TV/Monitor Standby Power
PC Peripherals
NB Adaptor
Simplified Application Circuit
Vo+
+
+
AC Mains
(90V to 265V)
Vo-
PRO
COMP
VDD
RT7736
GATE
CS
GND
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7736-05 June 2017
www.richtek.com
1
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