Datasheet > AN-9008

AN-9008

更新时间： 2022-11-25 11:11:44

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		转换器
页数	文件大小	规格书
9页	127K
描述
The Use of QFETs in a Flyback Converter

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AN-9008 数据手册

Table 2: Power Supply Specifications

1. Operating mode

2. Input voltage (V_in)

Flyback Discontinuous Mode

180 VAC to 265 VAC (50Hz/60Hz)

80 kHz

3. Switching frequency (f_sw

)

4. Output voltage (V_out

)

A. 160V ± 5% 0.3A

B. 15V ± 5% 0.8A

5. Efficiency (η)

75%

This flyback converter was tested in rated conditions of 220VAC input voltage, 80kHz switching

frequency, and 60W output power.

Figure 4 shows the waveforms for rated operating conditions using the QFET(FQP7N60) as the

switching device. The QFET is driven by a gate-source voltage of 15V and the voltage spike

across the drain-source terminal is adequately clamped to about 500V by an additional clamp cir-

cuit during off-time.

Vgs(5V.div)

Id(1A/div)

Vds(250V/div)

Figure 4: Operating Waveforms at Rated Conditions (V_in=220VAC, P_out=60W)

Rev D, July 2000

1 2 345 6 7...9

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