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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 requirements 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
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
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
R7780A
Absolute Maximum Ratings (Note 1)
HV ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 700V Supply Input Voltage, VDD ---------------------------------------------------------------------------------------------- −0.3V to 30V GATE ------------------------------------------------------------------------------------------------------------------------- −0.3V to 20V COMP, CS ------------------------------------------------------------------------------------------------------------------ −0.3V to 6.5V Power Dissipation, PD @ TA = 25°C
SOP-7 ------------------------------------------------------------------------------------------------------------------------ 0.36W DIP-8 ------------------------------------------------------------------------------------------------------------------------- TBD Package Thermal Resistance (Note 2) SOP-7, θJA ------------------------------------------------------------------------------------------------------------------ 276.5°C/W DIP-8, θJA -------------------------------------------------------------------------------------------------------------------- TBD Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) ----------------------------------.