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PT2209 Datasheet Preview

PT2209 Datasheet

Current-mode PWM Controller

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PT2209
Current-mode PWM Controller
GENERAL DESCRIPTION
FEATURES
The PT2209 is a highly integrated current mode PWM
controllerproviding low standby power and cost
effective system solution for the flyback converter
applications.
The PT2209 operates at fixed 65kHz frequency. Under
no load or light load conditions, PWM frequency is
reduced to minimize switching loss, low standby power
and high efficiency is thus achieved. The PT2209 also
features low VDD startup current which also
contributes to low standby power. The built in LEB on
the current sense input removes the signal glitches due
to snubber circuit diode reverse recovery and thus
reduces the external component count and the system
cost in the design.
A complete set protection is implemented in the
PT2209 including cycle-by-cycle current limiting
(OCP), over load protection (OLP), VDD over voltage
clamp and under voltage lockout (UVLO). The PT2209
also features latched shut down including
programmable OTP and programmable OVP protection.
By limiting the minimum frequency above 22 kHz, the
PT2209 based system eliminates the potential audible
noise when the system works under light or no load
conditions.
Excellent EMI performance is achieved with PowTech
proprietary frequency Jittering technique together with
soft driving control at totem pole gate drive output.
The PT2209 is available in an SOT23-6 package.
Frequency jittering for improved EMI
Green-Mode PWM for improved efficiency and
minimum standby power design
Fixed 65kHz PWM frequency
Built in 4mS soft start
Low start up current 20uA ( Typ. 3µA) and low
operation current (Typ. 1.8mA)
Current mode operation
Leading-edge blanking on current sense input
Constant output power limit for universal AC
input
Built-in power limit control (OLP)
Cycle-by-cycle current limiting (OCP)
Under voltage lockout (UVLO)
Latched programmable OTP
Latched programmable OVP
APPLICATIONS
Offline AC/DC flyback converters for
Power Adapter
Open-frame SMPS
Battery Charger Adapter
HB LED lighting.
TYPICAL APPLICATIONS
AC in
EMI
Filter
BD R4 C3
R2 C2
D3 C4 C5DC out
RNTC
C1 R1
D1
C1
U1
GND
GATE
FB VDD
RT SENSE
D2 T1
Q1
R3
R5
U2
C6
C7 R8
U3
TL431
R6
R7
China Resources Powtech (Shanghai) Limited
PT2209_DS Rev EN_1.0
WWW.CRPOWTECH.COM
Page 1




PowTech

PT2209 Datasheet Preview

PT2209 Datasheet

Current-mode PWM Controller

No Preview Available !

PIN ASSIGNMENT
PT2209
Current-mode PWM Controller
GND 1
FB 2
RT 3
6 GATE
5 VDD
4 SENSE
SOT23-6
PIN DESCRIPTIONS
NAMES
GND
FB
PIN No.
1
2
RT 3
SENSE
VDD
GATE
4
5
6
DESCRIPTION
Ground
Feedback input pin. PWM duty cycle is determined by voltage level
into this pin and SENSE pin voltage level.
Multi-function pin. Connects a NTC resistor between RT and GND
for ambient temperature OTP or connect a Zener diode to VDD for
over voltage protection.
Current sense input pin. Connected to MOSFET current sensing
resistor node.
DC power supply pin.
Totem-pole gate drive output for power MOSFET.
ORDERING INFORMATION
PACKAGE
SOT23-6, Pb free
TEMPERATURE
RANGE
-40to 85
ORDERING PART
NUMBER
PT2209E23F
TRANSPORT
MEDIA
3000/Tape and Reel
MARKING
2209
China Resources Powtech (Shanghai) Limited
PT2209_DS Rev EN_1.0
WWW.CRPOWTECH.COM
Page 2


Part Number PT2209
Description Current-mode PWM Controller
Maker PowTech
Total Page 14 Pages
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