PWM Controller. R7780 Datasheet
Burst Triple Mode PWM Controller
|Total Page||13 Pages|
Burst Triple Mode PWM Controller with Integrated HV
Start-up Device for Zero Power Monitor Application
The R7780 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 R7780 provides the users a superior AC/DC power
application of higher efficiency, few 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-7
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.
z Integrated HV Start-up Device
z Enable/Disable Function
z UVLO: 9V/16.5V
z Current Mode Control
z Built-in 65kHz Operation Frequency
z Built-in Jittering Frequency
z Internal PWM Leading Edge Blanking
z Internal Slope Compensation
z Compensated Burst Triple Mode PWM
z Cycle-by-Cycle Current Limit
z Internal Auto Recovery OVP
z Internal Auto Recovery OLP
z Internal Auto Recovery OTP
z CS Pin Open Protection
z Secondary Rectifier Short Protection
z Soft Driving for Reducing EMI Noise
z High Noise Immunity
z RoHS Compliant and Halogen Free
S : SOP-7
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
R7780GS : Product Number
YMDNN : Date Code
z Switching AC/DC Adaptor
z TV and Monitor Application
z Low Standby Power Home Appliance
R7780-01 September 2011
Typical Application Circuit
(90V to 265V)
R7780 HV 8
# See Application Information
Functional Pin Description
EN/DIS Enable/Disable Function.
Voltage Feedback. By connecting an opto-coupler to close control loop and
achieve the regulation.
CS Current Sensing.
GATE Gate Drive Output to Drive the External MOSFET.
Power Supply Pin.
NC No Internal Connection.
HV 700V High Voltage Device for Start-up.
R7780-01 September 2011
|Features||R7780 Burst Triple Mode PWM Controller with Integrated HV Start-up Device for Zero Power Monitor Application General Description The R7780 is a high-perfor mance current mode PWM controller with integrated HV start-up device inside. D uring start-up, a current source throug h integrated HV device to charge VDD ca pacitor for quick start-up while it dis sipates no loss in normal operation. Th e R7780 provides the users a superior A C/DC power application of higher effici ency, few external component counts, an d low cost solution. It features freque ncy jitter, Under Voltage LockOut (UVLO ), Leading Edge Blanking (LEB), interna l slope compensation in the tiny SOP-7 package. It offers complete protection coverage with Over Temperature Protecti on (OTP), Over Load Protection (OLP) an d Over Voltage Protection (OVP). Moreov er, it also provides a special interfac e for zero power application when the c onverter is in sleeping mode. EN/ DIS p in receives ON/OFF signal from secondary scalar controller. Dur.|
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