OB2362
Adaptive Multi-Mode PWM Controller
GENERAL DESCRIPTION
OB2362 is a high performance flyback adaptive
multi-mode(CCM/QR) PWM controller, optimized
to achieve high efficiency and low standby power
with effective system cost.
At heavy load, the IC operates in fixed
frequency(65kHz) CCM mode in the low line input
voltage. At medium load, it operates in QR mode ,
at light load ,it operates in green mode with valley
skip, and at no load the IC operates in extended
‘burst mode’ to minimize switching loss. Lower
standby power and higher conversion efficiency is
thus achieved.
VCC low startup current and low operating current
contribute to a reliable power on startup and low
standby design with OB2362.
OB2362 offers comprehensive protection
coverage with auto-recovery including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), and VCC under voltage lockout (UVLO). It
also provides the protections with latched shut
down including over temperature protection (OTP),
and over voltage protection (OVP). Excellent EMI
performance is achieved with On-Bright
proprietary frequency shuffling technique.
The tone energy at below 25KHz is minimized in
the design and audio noise is eliminated during
operation.
OB2362 is offered in SOT23-6 package.
APPLICATIONS
Offline AC/DC flyback converter for
■ Power Adapter
■ Set-Top Box Power Supplier
■ Open-frame SMPS
FEATURES
■ Power on soft start reducing MOSFET Vds
stress
■ Multi-Mode Operation
CCM @ Heavy Load and Low Line
Quasi-Resonant operation @ Medium Load
Green mode with valley skip @ Light Load
Burst Mode @ No Load
■ Frequency shuffling for EMI
■ Extended burst mode control for improved
efficiency and low standby power design
■ Audio noise free operation
■ Comprehensive protection coverage
o VCC Under Voltage Lockout with
hysteresis (UVLO)
o VCC Over Voltage Protection (VCC OVP)
o Cycle-by-cycle over current threshold
setting for constant output power limiting
over universal input voltage range
o Over Load Protection (OLP) with auto-
recovery
o External (if NTC resistor is connected at
PRT pin)or internal Over Temperature
Protection (OTP) with latched shut down
o Output Over Voltage Protection(Output
OVP) with latched shut down, and the
OVP triggered voltage can be adjusted by
the resistor connected between auxiliary
winding and PRT pin
o Output diode short protection with auto-
recovery
TYPICAL APPLICATION
AC IN
EMI
Filter
OB2362
GND GATE
FB VCC
PRT CS
Vaux
DC
Out
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_236200
