具有 250:1 PWM 調(diào)光和開路 LED 保護功能的 LT3755IUD 21W 降壓-升壓模式的典型應(yīng)用電路。 LT3755 是一款 DC/DC
控制器,設(shè)計用作驅(qū)動高
電流 LED 的
恒流源。它通過內(nèi)部 7.15V
穩(wěn)壓電源驅(qū)動低側(cè)外部 N 溝道功率 MOSFET。固定頻率、電流模式架構(gòu)可在較寬的
電源和輸出電壓范圍內(nèi)穩(wěn)定運行
說明
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Typical Application Circuit for LT3755IUD 21W Buck-Boost Mode with 250:1 PWM Dimming and Open LED Protection. The LT3755 is a DC/DC controller designed to operate as a constant-current source for driving high current LEDs. It drives a low side external N-channel power MOSFET from an internal regulated 7.15V supply. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages