OB2365AMP datasheet, PDF - EEWORLD Datasheet

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OB2365AMP: CategoryPower/power management Switching power supply chip; File Size662KB，2 Pages; ManufacturerOB(On-Bright); Websitehttp://www.on-bright.com/cn/index.htm; Angbao Electronics (Shanghai) Co., Ltd. is located in Zhangjiang Hi-Tech Park, Pudong, Shanghai, a national information technology industry base in China. It is an enterprise engaged in the design of high-performance analog and mixed-analog integrated circuits. The company focuses on the design, development, testing and sales of analog and mixed-analog integrated circuit products based on advanced submicron CMOS, BIPOLAR, BICMOS, BCD and other process technologies, with communications, consumer electronics, computers and computer interface devices as market targets, and is committed to becoming a world-class analog and mixed integrated circuit design company.

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OB2365A

Adaptive Multi-Mode PWM Controller

GENERAL DESCRIPTION

OB2365A is a highly integrated current mode

PWM control IC optimized for high performance,

low standby power and cost effective offline

flyback converter applications.

At normal load condition, it operates in QR mode

in high line input voltage. To minimize switching

loss, the maximum switching frequency in QR

mode is internally limited to 77 KHz. When the

loading goes low, it operates in PFM 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. Additionally, in the low line

input voltage, the IC operates in fixed frequency

(65KHz) CCM mode at the heavy loading. 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 OB2365A.

OB2365A offers comprehensive protection

coverage with auto-recovery including Cycle-by-

Cycle current limiting (OCP), over load protection

(OLP), VCC under voltage lockout (UVLO),

external 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.

OB2365A is offered in SOT23-6 package.

FEATURES

Power on soft start reducing MOSFET Vds

stress

■

Multi-Mode Operation

77KHz maximum clamping frequency in QR

mode @ Full Load in high line voltage

65KHz minimum clamping frequency in CCM

mode @ Heavy Load in low line voltage

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

VCC Under Voltage Lockout with

hysteresis (UVLO)

VCC Over Voltage Protection (VCC OVP)

Cycle-by-cycle over current threshold

setting for constant output power limiting

over universal input voltage range

Over Load Protection (OLP) with auto-

recovery

External (if NTC resistor is connected at

DEM pin)or internal Over Temperature

Protection (OTP) with auto-recovery

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 DEM pin

Output diode short protection with auto-

recovery

■

APPLICATIONS

Offline AC/DC flyback converter for

■

General power supply

■

Power Adapter

TYPICAL APPLICATION

EMI

Filter

AC IN

Out

Vaux

OB2365A

GND GATE

DEM

VCC

Confidential

-1-

Datasheet

OB_DOC_DS_2365AA0

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