【选型】电荷泵DC-DC变换器SGM3209YTDE8G/TR用于交流充电桩,输入电压3~18V
在某交流充电桩的开发中需要设计+12V电源以及-12V电源来满足握手电路设计的要求。本文推荐圣邦微(SGMICRO)推出的电荷泵DC-DC变换器SGM3209YTDE8G/TR,只需要少量外部器件便可将正电压转换为负电压源,极大的降低了开发难度;同时具有无需外部电感,且开关频率可调的特点。
本文就SGM3209YTDE8G/TR从功能性能参数以及封装大小方面进行分析,从而讨论其在交流充电桩产品中应用的优势。
SGM3209YTDE8G/TR功能以及典型应用如下:
图1. SGM3209YTDE8G/TR典型应用
由上图可知,SGM3209YTDE8G/TR为典型的电荷泵DC/DC变换器,能无需外部电感便能将正电压变换为负电压,由于无外部电感的设计,故在EMI方面具有十分明显的优势;同时较少的外部器件能有效降低成本且降低布板面积;集成使能控制功能,能灵活控制后级电路的供电通断,有效减少系统休眠是的损耗。
SGM3209YTDE8G/TR性能参数如下:
表1. SGM3209YTDE8G/TR性能参数
由上表可知,SGM3209YTDE8G/TR输入电压范围宽至3V~18V,较宽的输入电压范围能应用于更多的设计场景;同时输出电流高达100mA且输出阻抗低至15Ω,能有效提高带载能力;开关频率可调设计,结合实际应用能在输出纹波以及输出效率方面进行择优选择,具有更强的设计灵活性。
SGM3209YTDE8G/TR封装尺寸如下:
图2. SGM3209YTDE8G/TR封装尺寸
由上可知,TDFN-2×2-8L具备更小的尺寸且底部有散热焊盘设计,故在热阻以及布板面积方面优势明显。
综上所述,SGM3209YTDE8G/TR作为电荷泵DC/DC变换器用于交流充电桩中,在EMI,成本控制,系统体积,带载能力以及易用性方面具备一定的优势。
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