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LM2576S-ADJ 降压转换器评估模块

发布: 2020/2/15 15:50:16

LM2576S-ADJ,LM2576S-ADJEVM 评估模块 (EVM) 是一款组装完备且经过测试的电路,用于评估 LM2576 同步降压转换器。此 EVM 在 7V 至 40V 输入电压范围内运行,并提供 5V/3A 的输出。

LM2576S-ADJ特性

 简单高效的降压稳压器 可调节的输出电压 TTL 关断功能 输入电压工作上限高达 40V

1 Introduction The Texas Instruments LM2576S-ADJEVM evaluation module (EVM) helps designers evaluate the operation and performance of the LM2576 wide-input voltage Simple Switcher? buck regulator. The LM2576 is a simple to use DC-DC converter and it only requires a minimum number of external components. Other features include fault protection and a fixed-frequency oscillator. The LM2576EVM is configured for an output voltage of 5.0 V and a switching frequency of 52 kHz. Refer to the LM2576 datasheet for additional features, detailed description and available options. The EVM contains one DC-DC converter (See Table 1). Table 1. Device and Package Configurations

2 Setup This section describes the test points and connectors on the EVM and how to properly connect, set up and use the LM2576S-ADJEVM. Please refer to Figure 1 for a top view of the EVM and relative placement of the different test points and edge connector.

3 Input/Output (I/O) Connector Description VIN – Terminal on JIN—is the power input terminal for the converter. The terminal edge connector also provides a power (VIN) and ground (GND) connection to allow the user to attach the EVM to a cable harness. VOUT – Terminal on JOUT—is the regulated output voltage for the converter. The terminal edge connector also provides a power (VOUT) and ground (GND) connection to allow the user to attach the EVM to a cable harness. GND – Terminal on JIN and JOUT—are the ground reference for the converter. The terminal edge connector also provides a GND connection for attaching the EVM to a cable harness. OFF – Testpoint—is used to disable the converter by supplying a voltage greater than 1.4 V (typ). SW – Testpoint—is used to monitor the voltage on the switch pin and the switching frequency of the voltage regulator. Remove this test point before making any electromagnetic interference (EMI) measurements. 4 Setup Set the input voltage (VIN) range for the converter between the operating voltage range of 7 V to 40 V. If a load is driven, it should be applied to the VOUT terminal and should not exceed the maximum load current of 3 A. 5 Operation For proper operation of the LM2576, VIN, GND, and VOUT should be properly configured as stated above. In this configuration, the device will start up when power is applied and the output voltage of the regulator (VOUT) will come up to the proper value. The default setting for output voltage of the LM2576SADJEVM is 5.0V. Other output voltages can be set by replacing the feedback pin resistor dividers RFBT and RFBB; please consult the datasheet for proper selection of these resistor values. The default frequency for the LM2576S-ADJEVM is 52kHz.


技术资料