摘要:美国国家半导体(NS)日前推出适用于白色发光二极管的固定频率、电流模式升压直流/直流转换器LM3557。LM3557可为发光二极管提供恒定电流,并可驱动高达5个串在一起的发光二极管,为每一发光二极管提供20mA的驱动电流。由于LM3557设有24V固定电压的过压保护功能,因此无需为芯片增设保护二极管。
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