PT2312E
CC/CV Primary-Side Green Mode Convertor
CR POWTECH (SHANGHAI) CO., LTD. WWW.CRPOWTECH.COM Page 1
PT2312E_DS_Rev EN1.2
GENERAL DESCRIPTION
The PT2312E is a high performance
AC/DC power convertor for charger and
adaptor applications. Due to the PSR control,
the PT2312E can provide accurate constant
voltage (CV) and constant current (CC)
regulation without opto-coupler and TL431.
The PT2312E adopts PFM method in CC
control mode and PFM/PWM method in CV
control mode. In order to achieve high
performance, The PT2312E uses
quasi-resonant (QR) switching to improve the
efficiency, frequency shuffling technique to
optimize EMI design and built-in cable drop
compensation to meet good load regulation.
The PT2312E utilizes soft start control and
multi-protection to meet high reliability, such
as cycle-by-cycle current limiting, output OVP,
VCC OVP/UVLO, sense resistor open/short
protection, OTP etc.
PT2312E is offered in SOP-7 package.
FEATURES
PSR without opto-coupler and TL431
5% CV and 5% CC regulation at universal
AC input
QR operation for high efficiency
Frequency shuffling technique for EMI
Built-in cable drop compensation
Built-in adaptive current peak regulation
Built-in primary side winding inductance
compensation
Built-in leading edge blanking (LEB)
Power on soft-start
Cycle-by-cycle current limiting
VCC OVP/UVLO, Output OVP
CS resistor open and short protection
Over temperature protection(OTP)
Auto-recovery after trigger protection
APPLICATIONS
Adapters/Chargers
LED Lighting
Auxiliary Power Supplies
ORDERING INFORMATION
PACKAGE
TEMPERATURE
RANGE
ORDERING PART
NUMBER
TRANSPORT
MEDIA
MARKING
SOP-7
-40℃ to 85℃
PT2312EESOG
Tape and Reel
4000 units
PT2312E
xxxxxX
PT2312E
CC/CV Primary-Side Green Mode Convertor
CR POWTECH (SHANGHAI) CO., LTD. WWW.CRPOWTECH.COM Page 2
PT2312E_DS_Rev EN1.2
TYPICAL APPLICATION CIRCUIT
AC In
C1
R2
C2
C3
R3
R4
R5
R6
C4
D1
D2
T1
DRAIN
CS
VCC
FB
CRC
D3
GND
C5
R0
DB1
FR1
3
2
4
5,6
1
5V
5V
R1
Figure1. Typical Application of PT2312E
PIN ASSIGNMENT
7
6
5
1
2
3
4
FB
CRC
VCC
CS
GND
DRAIN
SOP-7
DRAIN
PT2312E
Figure 2. Pin Configuration of PT2312E (Top View)
PIN DESCRIPTIONS
PIN No.
DESCRIPTION
1
This pin connects a capacitor (10nF is recommended) to GND for system
stability regulation
2
Voltage feedback, The CV and CC regulation are realized based on the
voltage sampling of this pin
3
The power supply for the IC. In order to get the correct operation of the IC,
a capacitor with low ESR should be placed as close as possible to the
VCC pin
4
Primary Side Peak Current Detection Port
5,6
Open-drain of MOSFET
7
The ground of the IC