RT7737
Programmable Burst Switching Green Mode/Burst Mode
Level Flyback Controller
General Description
The RT7737 series are enhanced high efficient PWM
flyback controller with proprietary SmartJitter
TM
technology. The innovative SmartJitter
TM
technology
not only reduces the EMI emissions of SMPS when the
system enters burst switching green mode, but also
eliminates the output jittering ripple. Also, the RT7737
series feature programmable burst switching green
mode and burst mode level for adopting different
application requirements to optimize the product
performance. To meet the stringent trend toward
performance, the RT7737 series are the best choice for
product designers.
The RT7737 is available in SOT-23-6 package. It is a
current mode PWM controller providing comprehensive
protection functions, including an input Under-Voltage
Lockout (UVLO), a VDD Over-Voltage Protection
(OVP), an Over-Load Protection (OLP), a Secondary
Rectifier Sort Protection (SRSP), a CS pin open
protection and a cycle-by-cycle current limit. With the
above features, the RT7737 is a cost-effective and
compact solution for AC/DC products.
Features
Proprietary SmartJitter
TM
Technology
Reducing EMI Emissions of SMPS
Output Jittering Ripple Elimination
Programmable Burst Switching Green Mode
Level
Programmable Burst Mode Level
Accurate Over Load Protection
Driver Capability : 200mA/300mA
High Noise Immunity
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+
+
+
Mains
(90V to 265V)
Vo-
BURST
R
BS
VDD
GATE
R
CS_RC
CS
COMP
RT7737
GND
Copyright © 2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7737-00
September
2014
www.richtek.com
1
嵌入式系统
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