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RICHPOWER - Burst Triple-Mode PWM Flyback Controller

Numéro de référence R7731A
Description Burst Triple-Mode PWM Flyback Controller
Fabricant RICHPOWER 
Logo RICHPOWER 





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R7731A fiche technique
R7731A
Burst Triple-Mode PWM Flyback Controller
General Description
The R7731A is a high-performance, low cost, low start-up
current and current mode PWM controller with burst triple-
mode to support green mode power saving operation. The
R7731A integrates functions of soft start, Under VoItage
LockOut (UVLO), Leading Edge Blanking (LEB), Over
Temperature Protection (OTP) and internal slope
compensation. It provides the users a superior AC/DC
power application of higher efficiency, low external
component counts and lower cost solution.
To protect the external power MOSFET from being
damaged by supply over voltage, the R7731A output driver
is clamped at 12V. Furthermore, R7731A features fruitful
protections like Over Load Protection (OLP) and Over
Voltage Protection (OVP) to eliminate the external
protection circuits and provide reliable operation. R7731A
is available in SOT-23-6 and DIP-8 packages.
Applications
Adaptor and Battery Charger
ATX Standby Power
Set-Top Box (STB)
DVD and CD(R)
TV/Monitor Standby Power
PC Peripherals
Typical Application Circuit
Features
Very Low Start-up Current (<30uA)
10/14V UVLO
Soft Start Function
Current Mode Control
Jittering Switching Frequency
Internal Leading Edge Blanking
Built-in Slope Compensation
Burst Triple-Mode PWM for Green-Mode
Cycle-by-Cycle Current Limit
Feedback Open Protection
Over Voltage Protection
Over Temperature Protection
Over Load Protection
Soft Driving for Reducing EMI
High Noise Immunity
Opto-Coupler Short Protection
RoHS Compliant and Halogen Free
AC Mains
(90V to 265V)
VO+
VO-
RT VDD
R7731A
COMP
GATE
GND
CS
#
R7731A-07 Mar 2010
# See Application Information
1

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