Datasheet > DIO8804

DIO8804

更新时间： 2024-04-09 18:59:02

品牌	Logo	应用领域
帝奥微 - DIOO		功率因数校正
页数	文件大小	规格书
8页	462K
描述
The DIO8804 consists of an integrated single stage Buck & PFC Regulator and 600V power MOSFET, spe

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DIO8804 数据手册

DIO8804

Application Information

Start up

After AC or DC supply is powered on, the capacitor C_VINacross VIN and GND pin is charged up by BUS voltage

through a start up resistor R_ST. Once V_VINrises up to V_VIN-ON, the internal blocks start to work and PWM output is

enabled.

Shut down

After AC supply or DC BUS is powered off, the energy stored in the BUS capacitor will be discharged. When the

auxiliary winding of transformer can’t supply enough energy to VIN pin, V_VINwill drop down. Once V_VINis below

V_VIN-OFF, the IC will stop working and V_COMPwill be discharged to zero.

Quasi-Resonant Operation

QR mode operation provides low turn-on switching losses for Buck converter.

Over Voltage Protection (OVP) & Open LED Protection (OLP)

The output voltage is reflected by the auxiliary winding voltage of the transformer, and both ZCS pin and VIN pin

provide over voltage protection function. When the load is null or large transient happens, the output voltage will

exceed the rated value. When V_VINexceeds V_VIN,OVPor V_ZCSexceeds V_ZCS,OVP, the over voltage protection is

triggered and the IC will discharge V_VINby an internal current source I_VIN,OVP. Once V_VINis below V_VIN,OFF, the IC

will shut down and be charged again by BUS voltage through start up resistor. If the overvoltage condition still

exists, the system will operate in hiccup mode.

Short Circuit Protection (SCP)

When the output is shorted, the output voltage is clamped to zero. The voltage of the auxiliary winding is

proportional to the output winding, so V_VINwill drop down without auxiliary winding supply. Once V_VINis below

V_VIN,OFF, the IC will shut down and be charged again by the BUS voltage through the start up resistor. If the short

circuit condition still exists, the system will operate in hiccup mode. In order to guarantee SCP function not

effected by voltage spike of auxiliary winding, a filter resistor is needed (10Ω typically).

www.dioo.com

DIO8804• Rev. 1.1

1...3 4 567 8

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