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  Richtek Technology Electronic Components Datasheet  

RT7339P Datasheet

Active-PFC Constant-Voltage Controller

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RT7339P
Active-PFC Constant-Voltage Controller with Primary-Side
Regulation
General Description
The RT7339P is a constant voltage controller with the
active Power Factor Correction (PFC), which is
designed to meet the line current harmonic regulations.
It drives the converter in Quasi-Resonant (QR) mode to
achieve higher efficiency. By using the Primary-Side
Regulation (PSR), the RT7339P controls the output
voltage accurately without a shunt regulator and an
opto-coupler at the secondary side, reducing the
external component counts, the costs, and the volume
of the driver board.
The RT7339P is compatible with the external depletion
N-MOSFET to achieve fast startup and ultra-low
standby power consumption.
The totem-pole gate driver with the 400mA sourcing
current and 500mA sinking current provides the
powerful driving capability for a power MOSFET to
improve the conversion efficiency. In addition, the
built-in soft drive at the turn-on transition is better for
the EMI improvement.
The RT7339P integrates comprehensive protection
functions for robust designs, including output over
voltage protection, output short-circuit protection,
output diode short-circuit protection, VDD under
voltage lockout (UVLO), VDD over voltage protection
(VDD OVP), input under / over voltage protection,
external / internal over temperature protection (OTP),
and cycle-by-cycle high/low line current limitation.
Features
Tight Voltage Regulation
Power Factor Correction
THD Optimization (THD < 10%)
Quasi-Resonant (QR) Operation
Fast Startup
Fast Dynamic Response
Ultra-Low Standby Power Consumption
Soft Drive for the Better EMI Performance
Wide Supply Voltage Range (Up to 34V)
Maximum Frequency Limitation (117kHz)
Multiple Protection Features
Output Over Voltage Protection
Output Short-Circuit Protection
Input Under / Over Voltage Protection
Output Diode Short-Circuit Protection
VDD Over Voltage Protection
VDD Under Voltage Lockout (UVLO)
External / Internal OTP
Cycle-By-Cycle High / Low Line Current
Limitation (0.5V/0.6V typ.)
Applications
LED Lighting
AC-DC Adapter/Charger
Simplified Application Circuit
With Depletion N-MOS Application
Fuse
VAC
CCOMP
BD
DOUT
CIN
RHV
TX1
Depletion
NMOS
DHV
VDD
RT7339P
CVDD
DAUX
COUT VOUT
COMP GATE
Q1
GND
RGS
RPC
CS
RCS
DMAG
RDMAG1
RDMAG2
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
DS7339P-03 August 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT7339P Datasheet

Active-PFC Constant-Voltage Controller

No Preview Available !

RT7339P
Ordering Information
RT7339P
Package Type
E : SOT-23-6
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
5S=DNN
5S= : Product Code
DNN : Date Code
Pin Configuration
(TOP VIEW)
COMP DMAG CS
6
5
4
2
3
GND VDD GATE
SOT-23-6
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
GND
Ground of the controller.
2
VDD
3
GATE
4
CS
5
DMAG
6
COMP
Supply voltage (VDD) input. The controller will be enabled when VDD exceeds
VTH_ON and disabled when VDD is lower than VTH_OFF.
Gate driver output for an external power MOSFET. It is recommended to add an
external totem pole circuit if the Qg of MOSFET is greater than 60nC.
Current sense input. Connect this pin to the current sense resistor.
Demagnetization pin. To detect the input and the output voltage from the auxiliary
winding of the transformer.
Compensation node. Output of the internal trans-conductance amplifier.
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7339P-03 August 2019


Part Number RT7339P
Description Active-PFC Constant-Voltage Controller
Maker Richtek
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RT7339P Datasheet PDF






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