TI半导体产品应用报告：重要通知和销售条款

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TI Boost Converter Application Report Boost Converter 是一种 DC-DC 转换器，能够将低电压升高到高电压，广泛应用于混合信号产品中。以下是 TI Boost Converter 的知识点： 1. **Boost Converter 概念**：Boost Converter 是一种升压变换器，能够将输入电压升高到输出电压，常用于电池供电系统、通信设备、计算机系统等领域。 2. **TI Boost Converter 产品特点**：TI 的 Boost Converter 产品具有高效率、高可靠性、低噪音等特点，适合应用于各种 DC-DC 转换场景。 3. **应用场景**：Boost Converter 广泛应用于混合信号产品中，例如手机充电器、笔记本电脑供电系统、服务器供电系统等。 4. **TI 的知识产权声明**：TI 声明其不对任何第三方产品或服务提供任何形式的担保或认可，包括专利权、版权、半导体产品或服务等知识产权。 5. **产品销售条款**：TI 的产品销售条款包括销售协议、保修条款、知识产权声明等，客户在购买 TI 产品前应了解这些条款。 6. **产品测试和质量控制**：TI 对其半导体产品进行了严格的测试和质量控制，以确保产品的性能和可靠性。 7. **安全警示**：使用半导体产品可能涉及到生命危险或人身伤害的风险，例如医疗设备、交通系统等应用场景中，因此需要遵守相关安全规定和指导方针。 8. **TI 的责任声明**：TI 声明其不对任何应用中的损害或损失承担责任，包括但不限于人身伤害、财产损失、经济损失等。 9. **知识产权保护**：TI 对其知识产权进行了保护，包括专利权、版权、商标权等，任何侵犯 TI 知识产权的行为都是非法的。 10. **产品更新和停产**：TI 保留对其产品进行更新或停产的权利，客户应了解最新的产品信息和技术支持情况。

Boost Power Stage Steady-State Analysis

SLVA061

= i

Drive

Circuit

CR1

Figure 1. Boost Power Stage Schematic

During normal operation of the boost power stage, Q1 is repeatedly switched on

and off with the on and off times governed by the control circuit. This switching

action creates a train of pulses at the junction of Q1, CR1, and L. Although

inductor L is connected to output capacitor C only when CR1 conducts, an

effective L/C output filter is formed. It filters the train of pulses to produce a dc

output voltage, V

. The following sections give a more detailed quantitative

analysis.

2 Boost Power Stage Steady-State Analysis

A power stage can operate in continuous or discontinuous inductor current mode.

In continuous inductor current mode, current flows continuously in the inductor

during the entire switching cycle in steady-state operation. In discontinuous

inductor current mode, inductor current is zero for a portion of the switching cycle.

It starts at zero, reaches a peak value, and returns to zero during each switching

cycle. The two modes are discussed in greater detail later, and design guidelines

are given for the inductor value to maintain a chosen mode of operation as a

function of rated load. It is desirable for a power stage to stay in only one mode

over its expected operating conditions because the power stage frequency

response changes significantly between the two modes of operation.

For this analysis, an n-channel power MOSFET is used, and a positive voltage,

GS(ON)

, is applied from the gate to the source terminals of Q1 by the drive circuit

to turn on the MOSFET. The advantages of using an n-channel MOSFET are its

lower

DS(on)

(compared to a p-channel MOSFET), and the ease of driving it in

a boost power stage configuration.

Transistor Q1 and diode CR1 are drawn inside a dashed-line box with terminals

labeled a, p, and c. This is explained in the

Boost Power Stage Modeling

section.

2.1 Boost Steady–State Continuous Conduction Mode Analysis

The following is a description of steady-state operation in continuous conduction

mode. The main result of this section is a derivation of the voltage conversion

relationship for the continuous conduction mode boost power stage. This result

is important because it shows how the output voltage depends on duty cycle and

input voltage, or how, conversely, the duty cycle can be calculated based on input

and output voltages. Steady state implies that the input voltage, output voltage,

output load current, and duty-cycle are fixed and not varying. Capital letters are

generally given to variable names to indicate a steady-state quantity.

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