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OB2338 Datasheet Preview

OB2338 Datasheet

High Performance Current Mode PWM Power Switch

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OB2338
High Performance Current Mode PWM Power Switch
GENERAL DESCRIPTION
OB2338 combines a dedicated current mode
PWM controller with a high voltage power
MOSFET. It is optimized for high performance, low
standby power, and cost effective off-line flyback
converter applications in sub 27W range.
OB2338 offers complete protection coverage with
automatic self-recovery feature including Cycle-
by-Cycle current limiting (OCP), over load
protection (OLP), over temperature protection
(OTP), over voltage protection and VDD under
voltage lockout (UVLO).
Excellent EMI
performance is achieved with On-Bright
proprietary frequency shuffling technique together
with soft switching control at the totem pole gate
drive output.
The tone energy at below 20KHZ is minimized in
the design and audio noise is eliminated during
operation.
OB2338 is offered in DIP8 package.
APPLICATIONS
Offline AC/DC flyback converter for
AC/DC adapter
PDA power supplies
Digital Cameras and Camcorder Adapter
VCR, SVR, STB, DVD&DVCD Player SMPS
Set-Top Box Power
Auxiliary Power Supply for PC and Server
Open-frame SMPS
TYPICAL APPLICATION
FEATURES
Level 5 compliance with < 100mW standby
power at universal AC input
Power on soft start reducing MOSFET Vds
stress
Frequency shuffling for EMI
Extended burst mode control for improved
efficiency and minimum standby power design
Audio noise free operation
Fixed 55KHZ (typical) switching frequency
Internal synchronized slope compensation
Low VDD startup current and low operating
current
Leading edge blanking on current sense input
Comprehensive protection coverage
o VDD under voltage lockout with hysteresis
(UVLO)
o Over temperature protection (OTP) with
auto- recovery
o On-Bright proprietary line input
compensated
o Cycle-by-Cycle over-current threshold
setting for constant output power limiting
over universal input voltage range.
o Accurate Overload protection (OLP).
o Over voltage protection(OVP)
o Secondary Rectifier Short Protection
Output Power Table
Product
OB2338
230VAC±15%
Open Frame1
27W
85-265VAC
Open Frame1
16W
Notes: 1. Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50
ambient. Higher output power is possible with extra added heat sink or air circulation to reduce thermal resistance.
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_233801




On-Bright Electronics

OB2338 Datasheet Preview

OB2338 Datasheet

High Performance Current Mode PWM Power Switch

No Preview Available !

OB2338
High Performance Current Mode PWM Power Switch
GENERAL INFORMATION
Pin Configuration
The OB2338 is offered in DIP8 package as shown
below.
Package Dissipation Rating
Package
RJA (/W)
DIP8
75
Note: Drain Pin Connected to 100mm2 PCB copper clad.
Ordering Information
Part Number Description
OB2338AP
DIP8, Pb-free
Absolute Maximum Ratings
Parameter
Drain Voltage (off state)
Value
-0.3V to BVdss
VDD Voltage
-0.3V to 30 V
VDD-G Input Voltage
-0.3V to 30 V
FB Input Voltage
-0.3 to 7V
Sense Input Voltage
-0.3 to 7V
Min/Max Operating Junction
Temperature TJ
Min/Max Storage
Temperature Tstg
Lead Temperature
(Soldering, 10secs)
-40 to 150
-55 to 150
260
Note: Stresses beyond those listed under “absolute
maximum ratings” may cause permanent damage to the device.
These are stress ratings only, functional operation of the
device at these or any other conditions beyond those indicated
under “recommended operating conditions” is not implied.
Exposure to absolute maximum-rated conditions for extended
periods may affect device reliability.
OB2338 X X
Current Mode PWM Power Switch
Package
A:DIP8
Package Pb-free
P : Pb-free
Marking Information
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_233801


Part Number OB2338
Description High Performance Current Mode PWM Power Switch
Maker On-Bright Electronics
Total Page 9 Pages
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