Abstract: This article demonstrates how to achieve current limit for the MAX1692 PWM step-down regulator by using a MAX4173H current-sense amplifier. Additional Information: Quick View Data Sheet for the MAX1692 Quick View Data Sheet for the MAX4173 Samples and Literature Order Form Technical Support: Power A current limit can be added to a step-down converter by using a MAX4173H current-sense amplifier to inject current into the feedback network. D1 sharpens the threshold of current limit by converting the current sense feedback signal from linear to exponential. This current-limit circuit can be scaled for any output current by adjusting R3. In this case, the MAX1692 provides up to 600mA output and the MAX4173H limits the output current by decreasing the output voltage for output current above 300mA. IL (mA) VOUT (V) 0 3.827 100 3.729 200 3.701 258 3.637 (-5%) 300 3.503 312 3.444 (-10%) 347 3.254 (-15%) 380 3.062 (-20%) 400 2.951 414 2.862 (-25%) 450 2.630 500 2.305 550 1.977 600 1.732 我们期待您的反馈！ 喜欢？不喜欢？有待改善？或为我们提供建议？请与我们联系 — 我们将根据您的意见或建议改善我们的工作。 网页评价或提供建议 自动更新 需要自动接收最新发布的应用笔记吗？请订阅EE-Mail™ (English only)。 更多信息   APP 478: Dec 01, 2000 MAX1692 低噪声、5.5V输入、PWM降压型稳压器 完整的数据资料 (PDF, 160kB) 免费样品   下载，PDF格式 (31kB)  AN478, AN 478, APP478, Appnote478, Appnote 478