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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L99LD21 데이터시트(PDF) 1 Page - STMicroelectronics |
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L99LD21 데이터시트(HTML) 1 Page - STMicroelectronics |
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1 / 73 page  This is information on a product in full production. July 2018 DS11130 Rev 5 1/73 L99LD21 High power LED driver for automotive applications Datasheet - production data Features • AEC-Q100 qualified • General – ST SPI communication v4.1 – 5.5 to 24 V Operating battery voltage range – Load dump protected – QFN40L 6x6 (wettable flanks) with exposed pad – Timeout watchdog and limp home function – Low standby current • Boost Section – Fixed frequency architecture, programmable by SPI – Peak current mode control – Dual phase operation supported – Input current limitation – Soft start – Overvoltage protection (OVP) – Short feedback failure protection – Constant voltage control • Buck section – Integrated switching mosfets – Lossless current sensing without need of external components – Very accurate LED current setting programming inductor's peak current and peak-to-peak current ripple – Adjustable peak current by SPI – Adjustable current ripple by SPI – Integrated PWM generation unit with 10-bit resolution and phase shift – Peak current control – Constant VLED x TOFF architecture • Protection and diagnostic – Battery under voltage – Temperature warning (2 thresholds) – Overtemperature shutdown – LED voltage digital feedback through SPI – Buck outputs short circuit and open load protection Applications • Low Beam • High beam • Daytime running light • Turn indicator • Position light • Side marker • Fog light Description The L99LD21 is a flexible LED driver, which is specifically designed for the control of two independent high brightness LED strings for automotive front lighting applications. It consists of a high efficiency monolithic boost controller and a dual buck converter. The boost controller integrates a high current gate driver for an external n-channel mosfet. It delivers a constant output voltage, up to 60 V, which supplies the inputs of the two integrated or external buck converters. The boost controller of two devices can be stacked, in order to operate in dual phase for high power applications, with an interleaving pattern for an improved input current ripple. The buck converters integrate n-channel mosfet which is driven by a bootstrap circuit. www.st.com |
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