Question

各位好心人帮忙翻译下，急用啊，在线等，事成再给20分哈！信誉

Figure 8 shows a 12V, 20 W secondary regulated flyback power
supply using the TOP224P in an eight lead PDIP package and
operating from universal 85 to 265 VAC input voltage. This
example demonstrates the advantage of the higher power 8 pin
leadframe used with the TOPSwitch-II family. This low cost
package transfers heat directly to the board through six source
pins, eliminating the heatsink and the associated cost. Efficiency
is typically 80% at low line input. Output voltage is directly
sensed by optocoupler U2 and Zener diode VR2. The output
voltage is determined by the Zener diode (VR2) voltage and the
voltage drops across the optocoupler (U2) LED and resistor R1.
Other output voltages are possible by adjusting the transformer
turns ratio and value of Zener diode VR2.
AC power is rectified and filtered by BR1 and C1 to create the
high voltage DC bus applied to the primary winding of T1. The
other side of the transformer primary is driven by the integrated
TOPSwitch-II high-voltage MOSFET. D1 and VR1 clamp leading-edge voltage spikes caused by transformer leakage
inductance. The power secondary winding is rectified and
filtered by D2, C2, L1, and C3 to create the 12V output voltage.
R2 and VR2 provide a slight pre-load on the 12V output to
improve load regulation at light loads. The bias winding is
rectified and filtered by D3 and C4 to create a TOPSwitch bias
voltage. L2 and Y1-safety capacitor C7 attenuate common
mode emission currents caused by high voltage switching
waveforms on the DRAIN side of the primary winding and the
primary to secondary capacitance. Leakage inductance of L2
with C1 and C6 attenuates differential-mode emission currents
caused by the fundamental and harmonics of the trapezoidal or
triangular primary current waveform. C5 filters internal
MOSFET gate drive charge current spikes on the CONTROL
pin, determines the auto-restart frequency, and together with
R1 and R3, compensates the control loop.
请来个专业点的，别糊弄人啊，很严肃的

Answer 1

图8显示了一个12伏，二次调节回扫功率20瓦使用top224p在八一包经营由通用85至265伏的输入电压。这示例演示了利用高功率的8针引线框架用的topswitch-ii家庭。这种低成本包传输热量直接向董事会通过六个来源针，消除了散热片和相关的成本。效率通常是80%在低线输入。输出电压直接感觉到你vr2和齐纳二极管耦合器。输出功率电压是由齐纳二极管（vr2）电压和电压降落到光电耦合器（U 2）发光二极管和电阻。其他输出电压可能通过调节变压器匝数比和价值vr2齐纳二极管。交流电源整流和滤波的BR 1与创造高电压直流总线应用到初级绕组的T。本另一边的变压器主要是由综合topswitch-ii高压场效应管。和VR夹领先的电压尖峰造成变压器的渗漏电感。电力二次绕组整流和过滤，C 2，C1，并创造2V输出电压。和vr2提供一个轻微的预加载的电压输出改善负载调节在轻负载。偏置绕组整顿和过滤的D和C创建一个开关偏见电压。二级和y1-safety电容C减轻常见模式的排放造成的高电压开关波形的漏极一侧的初级绕组和小学到中学电容。漏电感L与C 1和C抑制差模发射电流造成的基本和谐波的梯形或三角初级电流波形。碳过滤器内部栅极驱动电流峰值控制针，决定启动频率，并与R 1、R 3，补偿控制回路分享到
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Answer 2

图8显示了一个12V，20瓦二次调节反激式电源
供应用8引脚PDIP封装，TOP224P
从普遍的85到265 VAC输入操作电压。这
例子演示了更高的功率优势8针
引线框架使用了TOPSwitch - II系列。这样低的成本
包传热直接向董事会通过六个来源
引脚，从而消除了散热片和相关费用。效率
通常在低线投入80％。输出电压是直接
意识到由光耦合器U2和齐纳二极管VR2。输出
电压是由齐纳二极管（VR2）电压和
在整个电压下降光耦（U2乐队）LED和电阻R1。
其它输出电压是可能的，通过调整变压器
匝数比齐纳二极管VR2和价值。
交流电源进行整流和滤波即BR1和C1创建
高压直流总线应用到T1的初级绕组。该
在变压器初级的另一面是由集成驱动
的TOPSwitch - II的高电压MOSFET。 D1和VR1的钳尖端的电压尖峰引起的变压器漏
电感。次级绕组的功率和纠正
通过D2，C2的，一楼和C3过滤创建12V输出电压。
R2的轻微和VR2预先提供的12V输出到负载
改善轻载负荷调节。偏置绕组
纠正和维生素D3和C4 TOPSwitch的偏见，创造一个过滤
电压。 L2和Y1的安全电容C7衰减共同
模式废气排放造成的高开关电压电流
波形的漏极一侧的初级绕组和
小学至中学电容。漏感的L2
与C1和C6抑制差模发射电流
造成的根本和梯形或谐波
三角初级电流波形。碳五过滤器内部
在控制MOSFET的栅极驱动充电电流尖峰
针，决定自动重启动频率，连同
R1和R3的，补偿的控制回路。

Answer 3

ls
厉害~