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RICHPOWER - Burst Triple-Mode PWM Controller

Numéro de référence R7779
Description Burst Triple-Mode PWM Controller
Fabricant RICHPOWER 
Logo RICHPOWER 





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R7779 fiche technique
R7779
Burst Triple-Mode PWM Controller with Integrated HV
Start-up Device for Zero Power Monitor Application
General Description
Features
The R7779 is a high-performance current mode PWM
controller with integrated HV start-up device inside. During
start-up, a current source through integrated HV device to
charge VDD capacitor for quick start-up while it dissipates
no loss in normal operation.
The R7779 provides the users a superior AC/DC power
application of higher efficiency, low external component
counts, and low cost solution. It features frequency jitter,
Under Voltage LockOut (UVLO), Leading Edge Blanking
(LEB), internal slope compensation in the tiny SOP-8
package. It offers complete protection coverage with Over
Temperature Protection (OTP), Over Load Protection
(OLP) and Over Voltage Protection (OVP).
Moreover, it also provides a special interface for zero power
application when the converter is in sleeping mode. EN/
DIS pin receives ON/OFF signal from secondary scalar
controller. During turning off, the controller will be shutdown
completely with pretty low power consumption.
Integrated HV Start-up Device
UVLO : 9V/16.5V
Current Mode Control
Built-in 65kHz Operation Frequency
Jittering Frequency
Internal PWM Leading Edge Blanking
Internal Slope Compensation
Compensated Burst Triple-Mode PWM
Cycle-by-Cycle Current Limit
Internal Auto Recovery OVP
Internal Auto Recovery OLP
Internal Auto Recovery OTP
Secondary Rectifier Short Protection
Soft Driving for Reducing EMI Noise
High Noise Immunity
RoHS Compliant and Halogen Free
Applications
Switching AC/DC Adaptor and Battery Charger
TV and Monitor Application
Typical Application Circuit
AC Mains
(90V to 265V)
OPTO2
OPTO1
R7779 HV
EN/DIS VDD
COMP
GND
GATE
CS
#
OPTO1
# See Application Information
VO+
VO-
# LDO
GPIO
Scalar
OPTO2
R7779-04 July 2009
1

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