®
R7735
High Performance PWM Flyback Controller
General Description
Features
No Load Input Power Under 100mW
Accurate Over Load Protection
UVLO 9V/14V
R7735 series is the successor of R7732/3 and fully
compatible with most of SOT-23-6 / DIP-8 product so far
in the market. It has enhanced mode PWM controller and
owns excellent green power performance, especially under
light load and no load conditions. It focuses on "easy to
design" in different applications and it will save both design
effort and external components.
Current Mode Control
Slope Compensation
Internal Leading Edge Blanking
Excellent Green Power Performance
Cycle-by-Cycle Current Limit
Internal Over Voltage Protection
Secondary Rectifier Short Protection
Opto-Coupler Short Protection
Feedback Open-Loop Protection
CS Pin Open Protection
Besides the general features shown in the Features
section, R7735 covers wide protection options, such as
internal Over Load Protection (OLP) and Over Voltage
Protection (OVP) to eliminate the external protection
circuits. Moreover, it also features Secondary Rectifier
Short Protection (SRSP) and CS pin open protection. This
protection will make the PSU design for reliability and
safety easier.
Jittering Frequency
PRO Pin for External Arbitrary OVP/OTP
Soft Driving for EMI Noise
R7735 is designed for power supply such as NB adaptor
which is a very cost effective and compact design. The
precise external OVP and Over Temperature Protection
(OTP) can be implemented by very simple circuit. The
start-up resistors can also be replaced by bleeding
resistors to save power loss and component count.
High Noise Immunity
RoHS Compliant and Halogen Free
Applications
SwitchingAC/DCAdaptor
DVDOpen Frame Power Supply
Set-Top Box (STB)
Ordering Information
R7735
ATX Standby Power
TV/Monitor Standby Power
PC Peripherals
(B)* (* : See Version Table)
Package Type
E : SOT-23-6
NBAdaptor
N : DIP-8 (R7735G Only)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Marking Information
R7735 Version (Refer to Version Table)
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Copyright 2014 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
R7735-04 May 2014
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]