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电子发烧友网>电子资料下载>音视频类>AN-1645的LM4702芯片驱动MOSFET输出级

AN-1645的LM4702芯片驱动MOSFET输出级

2017-05-21 | rar | 1.28 MB | 次下载 | 免费

资料介绍

  MOSFET Amplifier Design

  Figure 1 shows the basic block diagram of an amplifier using the LM4702. The amplifier consists of three building blocks, the LM4702, the bias stage, and the output stage (there are no protection circuits)。 Each stage will be covered in detail. The power supply design will not be covered as a basic unregulated supply consisting of a transformer, a bridge rectifier, with noise and reservoir capacitors is well known and common.

  The LM4702 is a high voltage driver that includes the input stage and voltage amplifier stage (VAS) of a power amplifier. The LM4702, with feedback from the output stage, sets the gain and is externally compensated to set the slew rate. The outputs of the LM4702 drive the top and bottom sides of the bias and output stages. The LM4702 performance details are limited to basic recommendations on ranges for gain, slew rate, and the component types that achieve the best performance.

  The bias stage performs two functions. First, it sets the DC bias voltage and resulting bias current in the output stage for Class A, AB or B operation. Second, it allows thermal compensation that maintains steady bias current as the output stage devices vary in temperature. As will be shown, certain devices do not need temperature compensation and the bias stage becomes as simple as a resistor. Other devices will need thermal tracking and temperature compensation controlled by the bias stage.

  The output stage is a basic Source-Follower stage using a single pair of complementary N-channel and Pchannel transistors for simplicity. The same output stage design will be used for all devices listed in Table 1.

AN-1645的LM4702芯片驱动MOSFET输出级

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