WS3412 Ver la hoja de datos (PDF) - Shenzhen Winsemi Microelectronics Co., Ltd

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WS3412

Active PFC Non-isolated Buck LED Driver

Shenzhen Winsemi Microelectronics Co., Ltd 

WS3412 Product Description

The WS3412 uses the patent source driver structure. The

typical operation current is as low as 200uA, the auxiliary

winding is not need. So the system design is simple and the

cost is low.

WS3412 will automatic detect the output voltage when

enters hiccup mode; and will re-enter the normal working

state when the output voltage is lower than Vovp.

Output Open(Short) protection

Output open/short protection is integrated inside WS3412.

Once output open/short circuit is detected, the system will

automatic enter hiccup mode until the protection signal

disappear.

Over Temperature Automatic adjustment of output

current

WS3412 has over temperature regulating function, gradually

reducing the output current when the power is over

temperature, so as to control the output power and the

temperature rise, keeping the power temperature in a setting

value in order to improving the reliability of the system. The

starting regulation temperature is 135℃.

Input Filter Capacitor

In order to obtain high PF value, the input capacitor can not

be too large. 10-100nF is recommended.

Power Factor Correction

Active PFC control circuit is integrated in WS3412, which

can get high PF value and low THD.

PCB Design

The following guidelines should be followed in WS3412 PCB

layout:

Bypass Capacitor: The bypass capacitor on VCC pin should

be as close as possible to the VCC and GND pins.

Ground Path: The power ground path for current sense

should be short, and the power ground path should be

separated from small signal ground path before the negative

node of the bulk capacitor.

The Area of Power Loop: The area of power loop should be

as small as possible to reduce EMI radiation.

And the controller should be placed away from the heat

generator, such as the power diode.

WIN SEM I M ICROELECTRON ICS

WIN SEM I M ICROELECTRON ICS

WIN SEM I M ICROELECTRON ICS

www.winsemi.com Tel : 0755-82506288 Fax : 0755-82506299

WIN SEM I M ICROELECTRON ICS

WIN SEM I M ICROELECTRON ICS

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