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OB2273AP View Datasheet(PDF) - Unspecified

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OB2273AP Datasheet PDF : 12 Pages
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OB2273
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
FEATURES
OB2273 is a highly integrated current mode PWM Power on Soft Start Reducing MOSFET Vds
control IC optimized for high performance, low
Stress
standby power and cost effective offline flyback Frequency shuffling for EMI
converter applications.
PWM switching frequency at normal operation is
internally fixed and is trimmed to tight range. At no
load or light load condition, the IC operates in
extended ‘burst mode’ to minimize switching loss.
Lower standby power and higher conversion
efficiency is thus achieved.
VDD low startup current and low operating current
contribute to a reliable power on startup and low
standby design with OB2273.
OB2273 offers complete protection coverage with
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Design
Audio Noise Free Operation
Fixed 65KHZ Switching Frequency
Comprehensive Protection Coverage
o
o
VDD Under Voltage Lockout with
Hysteresis (UVLO)
Cycle-by-cycle over current threshold
o setting for constant output power limiting
t over universal input voltage range
auto-recovery including Cycle-by-Cycle current
limiting (OCP), over load protection (OLP), and
l VDD under voltage lockout (UVLO). It also
provides the protections with latched shut down
a including over temperature protection (OTP), and
i over voltage (fixed or adjustable) protection (OVP).
Excellent EMI performance is achieved with On-
t Bright proprietary frequency shuffling technique.
n The tone energy at below 20KHZ is minimized in
the design and audio noise is eliminated during
e operation.
fid OB2273 is offered in SOT23-6 and DIP-8 package.
o Overload Protection (OLP) with auto-
recovery
o Over Temperature Protection (OTP) with
latch shut down
o VDD Over voltage Protection(OVP) with
latch shut down
o Adjustable OVP through external Zener
APPLICATIONS
Offline AC/DC flyback converter for
Battery Charger
Power Adapter
Set-Top Box Power Supplies
Open-frame SMPS
Con TYPICAL APPLICATION
Bright
On
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_227305
 

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