PWM Controller. R7711A Datasheet

R7711A Controller. Datasheet pdf. Equivalent

R7711A Datasheet
Recommendation R7711A Datasheet
Part R7711A
Description Primary Feedback CC/CV PWM Controller
Feature R7711A; ® R7711A Primary Feedback CC/CV PWM Controller for Flyback Converters General Description Feature.
Manufacture Richtek
Datasheet
Download R7711A Datasheet




Richtek R7711A
®
R7711A
Primary Feedback CC/CV PWM Controller for Flyback
Converters
General Description
Features
The R7711A is a current mode PWM controller which
includes primary side voltage feedback technology. It
controls the output voltage and current accurately without
shunt regulator and opto-coupler on secondary side to
reduce the part count and save costs.
The R7711A is designed especially for low power
applications, such as chargers for cell phones, PDAs,
and other mobile products. Complete protections are
provided, such as output Under- Voltage Protection, output
Over-Voltage Protection, VDD Over-Voltage Protection,
Over-Temperature Protection, and Secondary Rectifier
Short-circuit Protection. The ultra low start-up current and
operating current of the R7711A achieves low power
consumption in standby mode. The R7711A supports burst
switching green mode operation to meet CEC regulations
and Energy-Star requirements.
Programmable Primary-Side CC/CV Regulation
Low No Load Input Power (<30mW at 230VAC)
Burst Switching Green Mode PWM Operation
Low Start-up Current (<10mA)
Easy EMI Solution
Built-in Jittering Frequency
Built-in Soft Gate Driver
Programmable Cable Drop Compensation
Adjustable Propagation Delay Compensation
VDD Over-Voltage Protection (VDDOVP)
Output Over-Voltage Protection (OVP)
Output Under-Voltage Protection (UVP)
Secondary Rectifier Short-Circuit Protection (SRSP)
Internal Over-Temperature Protection (OTP)
RoHS Compliant and Halogen Free
Applications
Switching AC/DC Adaptor and Battery Charger
DVD Open Frame Power Supply
STB Power
Cell Phone Charger
Networking Power Supply
Simplified Application Circuit
L
AC Mains
(90V to 265V)
N
VDD DMAG
R7711A
COMP GATE
CS
GND
2
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
R7711A-06 May 2014
VOUT
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek R7711A
R7711A
Ordering Information
R7711A
Package Type
E : SOT-23-6
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Pin Configurations
(TOP VIEW)
CS COMP DMAG
65 4
23
GATE GND VDD
SOT-23-6
Marking Information
FN=DNN
FN= : Product Code
DNN : Date Code
Functional Pin Description
Pin No.
1
2
3
4
5
6
Pin Name
GATE
GND
VDD
DMAG
COMP
CS
Pin Function
MOSFET Gate Driver Output. Connect this pin to the Gate of an external N-Channel
power MOSFET.
Ground of the Controller.
Power Supply Input. The controller will be enabled when VDD exceeds VTH_ON and
disabled when VDD decreases lower than VTH_OFF.
Demagnetization Pin. Input and Output Voltage Detection from Auxiliary Winding.
The current (ICABLE) flows into this pin to achieve cable drop compensation function.
This pin is also used to detect the signal of the rectified input voltage for propagation
delay compensation and minimum on-time control.
Feedback Compensation Pin. This pin is the output of the internal operational
transconductance amplifier (OTA) to connect a proper RC network from this pin to
GND for feedback loop compensation.
Current Sensing Input. Connect this pin to a current sense resistor used to detect the
current of the primary-side winding.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
R7711A-06 May 2014



Richtek R7711A
Function Block Diagram
R7711A
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
R7711A-06 May 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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