OB2354
Current Mode PWM Power Switch
GENERAL DESCRIPTION
OB2354 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 20W range.
OB2354 offers complete protection coverage with
automatic self-recovery feature including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), VDD over voltage clamp and 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.
OB2354 is offered in DIP8 package.
■
Freq Shuffling
Fixed 50KHZ Switching Frequency
■
Internal Synchronized Slope Compensation
■
Low VDD Startup Current and Low Operating
Current
■
Leading Edge Blanking on Current Sense Input
■
Good Protection Coverage With Auto Self-
Recovery
o
VDD Over Voltage Clamp and Under Voltage
Lockout with Hysteresis (UVLO)
o
On-Bright Proprietary Line Input Compensated
Cycle-by-Cycle Over-current Threshold Setting
For Constant Output Power Limiting Over
Universal Input Voltage Range.
o
Overload Protection (OLP).
o
Over voltage Protection(OVP)
APPLICATIONS
FEATURES
■
■
■
■
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
TYPICAL APPLICATION
w
w
.
w
h
C
n
i
Offline AC/DC flyback converter for
■
Battery Charger
■
PDA power supplies
■
Digital Cameras and Camcorder Adaptor
■
VCR, SVR, STB, DVD&DVCD Player SMPS
■
Set-Top Box Power
■
Auxiliary Power Supply for PC and Server
■
Open-frame SMPS
d
a
.
z
m
o
C
Output Power Table
Product
OB2354
Notes:
1.
230VAC±15%
Open Frame
1
21W
85-265VAC
Open Frame
1
16W
Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50
℃
ambient.
©On-Bright Electronics
Confidential
OB_DOC_DS_5400
BRIGHT [ BRIGHT LED ELECTRONICS CORP ]
