OB2362D

GENERAL DESCRIPTION

OB2362Dis 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 currentcontribute to a reliable power on startup and low standby design with OB2362D.

OB2362D offers comprehensive protection coverage including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), VCC under voltage lockout (UVLO), Over Temperature Protection (OTP)with auto-recovery, andVCC and output Over Voltage Protection (OVP) with latch shutdown. 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.

OB2362D is offered in SOT23-6 package.

FEATURES

■Power on soft start reducing MOSFET Vds stress

■Multi-Mode Operation:

130KHz maximum frequency PWM at peak load;

65KHz fixedfrequency PWM at full load;

Valley switching operation at light to middle load range;

Burst mode at light load and 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

oVCC Under Voltage Lockout with hysteresis (UVLO)

oVCC Over Voltage Protection (VCC OVP) with latch shut down.

oInternal integrated two level OCP protection

oInternal integrated SCP protection

oOver Load Protection (OLP)

oExternal (if NTC resistor is connected at RT pin) or internal (if RT pin floating) Over Temperature Protection (OTP) with auto recovery protection.

oOutput diode short protection with auto recovery protection

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

oOutput Over Voltage Protection(Output OVP) with latched shut down, andthe OVP triggered voltage can be adjusted by the resistor connected between auxiliary winding and PRT pin

APPLICATIONS

Offline AC/DC flyback converter for

■General power supply

■Power Adapter

TYPICAL APPLICATION

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