GENERAL DESCRIPTION

OB2362I is a highly integrated current mode PWM

control IC optimized for high performance, low

standby power and cost effective offline flyback

converter applications.

At full loading, the IC operates in fixed frequency

(100KHz) mode. When the loading goes low, it

operates in Green mode with valley switching for

high power conversion efficiency. When the load is

very small, the IC operates in ‘Extended Burst

Mode’ to minimize the standby power loss. As a

result, high conversion efficiency can be achieved

in the whole loading range.

VCC low startup current and low operating current

contribute to a reliable power on startup and low

standby design with OB2362I.

OB2362I offers comprehensive protection

coverage with auto-recovery including Cycle-byCycle current limiting (OCP), over load protection

(OLP), VCC under voltage lockout (UVLO), 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 21KHz is minimized in

the design and audio noise is eliminated during

operation.

OB2362I is offered in SOT23-6 package.

APPLICATIONS

Offline AC/DC flyback converter for

■ General power supply

■ Power Adapter

FEATURES

■ Power on soft start reducing MOSFET Vds

stress

■ Multi-Mode Operation

100KHz fix frequency mode @ Full Load

Valley switching operation @ Green mode

Burst Mode @ Light Load & 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 autorecovery

o External (if NTC resistor is connected at

PRT pin)or internal Over Temperature

Protection (OTP) with auto-recovery

o Output Over Voltage Protection(Output

OVP) with auto-recovery, and the OVP

triggered voltage can be adjusted by the

resistor connected between auxiliary

winding and PRT pin

o Output diode short protection with autorecovery