OB2363E

GENERAL DESCRIPTION

OB2363E 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 (65KHz) 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 OB2363E.

OB2363E offers comprehensive protection coverage including Cycle-by-Cycle 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 23KHz is minimized in the design and audio noise is eliminated during operation.

OB2363E is offered in SOT23-6 package.

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APPLICATIONS

Offline AC/DC flyback converter for

■   General power supply

■   Power Adapter

FEATURES

■   Power on soft start reducing MOSFET Vds stress

■   Multi-Mode Operation

130KHz max frequency mode @ Peak Load

65KHz 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    Internal integrated two level OCP protection

o    Internal integrated SCP protection

o    Over Load Protection (OLP)

o    External (if NTC resistor is connected at RT pin) or internal (if RT pin floating) Over Temperature Protection (OTP) with latched shut down

o    Bulk Cap Open Protection

o    Output diode short protection

o    Cycle-by-cycle over current threshold setting for constant output power limiting over universal input voltage range

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

TYPICAL APPLICATION