PWM Controller. R7780A Datasheet

R7780A Controller. Datasheet pdf. Equivalent

R7780A Datasheet
Recommendation R7780A Datasheet
Part R7780A
Description Burst Triple Mode PWM Controller
Feature R7780A; ® R7780A Burst Triple Mode PWM Controller with Integrated HV Start-up Device for Zero Power Monitor.
Manufacture Richtek Technology
Datasheet
Download R7780A Datasheet




Richtek Technology R7780A
®
R7780A
Burst Triple Mode PWM Controller with Integrated HV
Start-up Device for Zero Power Monitor Application
General Description
The R7780A 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 R7780A provides users a superior AC/DC power
application of higher efficiency, few external component
count, 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, and offers complete protection coverage with Over
Temperature Protection (OTP), Over Load Protection (OLP)
and Over Voltage Protection (OVP).
Ordering Information
R7780A
Package Type
S : SOP-7
N : DIP-8
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.
Marking Information
R7780AGS
R7780A
GSYMDNN
R7780AGS : Product Number
YMDNN : Date Code
Features
Integrated HV Start-up Device
UVLO: 9V/16.5V
Current Mode Control
Built-in 65kHz Operation Frequency
Built-in 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
CS Pin Open Protection
Secondary Rectifier Short Protection
Soft Driving for Reducing EMI Noise
High Noise Immunity
RoHS Compliant and Halogen Free
Applications
Switching AC/DC Adaptor
TV and Monitor Application
Low Standby Power Home Appliance
Pin Configurations
(TOP VIEW)
NC
COMP
CS
GND
2
3
4
7 HV
6 VDD
5 GATE
SOP-7
HV NC VDD GATE
R7780AGN
RichTek
R7780A
GNYMDNN
R7780AGN : Product Number
YMDNN : Date Code
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
R7780A-01 August 2014
87
65
2 34
NC COMP CS GND
DIP-8
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek Technology R7780A
R7780A
Typical Application Circuit
AC Mains
(90V to 265V)
#
R7780A HV
VDD
COMP
GND
GATE
CS
OPTO1
#
OPTO1
#
VO+
VO-
LDO
# See Application Information
GPIO Scalar
OPTO2
Functional Pin Description
Pin No.
SOP-7 DIP-8
Pin Name
Pin Description
1 1, 7 NC
No Internal Connection.
2
2 COMP
Voltage Feedback. By connecting an opto-coupler to close control loop and
achieve the regulation.
3 3 CS
Current Sense Input.
4
4 GND
Ground.
5
5 GATE
Gate Driver Output. Connect a resistor from this pin to the external power
MOSFET.
6
6 VDD
Power Supply Input.
7 8 HV
700V High Voltage Input Pin for Start-up.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
R7780A-01 August 2014



Richtek Technology R7780A
Function Block Diagram
HV
R7780A
COMP
CS
Secondary Rectifier Short Protection
2.6V - & CS Open Protection
+
Shutdown
Logic
Brownout
Sensing
OLP
COMP Open
Sensing
Counter
OTP
POR
OVP
+
-
UVLO
+
-
28V
9/16.5V
Oscillator
Bias &
Bandgap
Constant
Power
SS
Slope
Ramp
LEB X3
Dmax
-
-
+
PWM
Comparator
S
Q
R
Burst Triple
Mode& TP
Compensation
Soft
Driver
COMP
VBURH
VBURL
VDD
VDD
GATE
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
R7780A-01 August 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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