PWM Controller. R7779 Datasheet

R7779 Controller. Datasheet pdf. Equivalent

R7779 Datasheet
Recommendation R7779 Datasheet
Part R7779
Description Burst Triple-Mode PWM Controller
Feature R7779; R7779 Burst Triple-Mode PWM Controller with Integrated HV Start-up Device for Zero Power Monitor Ap.
Manufacture RICHPOWER
Datasheet
Download R7779 Datasheet




RICHPOWER R7779
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



RICHPOWER R7779
R7779
Ordering Information
R7779
Package Type
S : SOP-8
Operating Temperature Range
G : Green (Halogen Free with Commercial Standard)
Note :
Richpower Green 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.
Marking Information
For marking information, contact our sales representative directly or through a Richpower distributor located in your
area, otherwise visit our website for detail.
Pin Configurations
(TOP VIEW)
EN/DIS
COMP
CS
GND
2
3
4
8 HV
7 NC
6 VDD
5 GATE
SOP-8
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
Pin Name
Pin Function
EN/DIS Enable function pin.
COMP
Voltage feedback pin. By connecting a opto-coupler to close control loop and
achieve the regulation.
CS Current sensing pin.
GND
Ground.
GATE
Gate drive output to drive the external MOSFET.
VDD
Power supply pin.
NC No connection.
HV 500V high voltage device for start-up.
2 R7779-04 July 2009



RICHPOWER R7779
Function Block Diagram
EN/DIS 1
HV
8
1.7V
Secondary Rectifier
Short Protection
-
+
Brownout
Sensing
OLP
COMP Open
Sensing
Shutdown
Logic
Counter
OTP
POR
OVP
+
-
UVLO
+
-
27V
9/16.5V
Oscillator
Bias &
Bandgap
COMP 2
CS 3
Constant
Power
SS
Slope
Ramp
LEB X3
Dmax
-
-
+
PWM
Comparator
S
Q
R
Burst Triple
Mode& TP
Compensation
Soft
Driver
COMP
VBURH
VBURL
VDD
R7779
6 VDD
5 GATE
R7779-04 July 2009
3







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