6.3v/AC降到5V

2010-12-10 2:57 am
請問各位

想問火牛出6.3v/AC降到5V/負載2A...電阻要多大....???


thanks

bus

回答 (1)

2010-12-10 6:04 am
✔ 最佳答案
如果單純的降壓 6.3V - 5V 2A
用一個電阻加一個冉納二極管就搞掂,

圖片參考:http://www.juliantrubin.com/encyclopedia/electronics/zener_diode_files/220px-Zener_diode_voltage_regulator.png

UIN - UOUT = 6.3 - 5.0 = 1.3
I = 2A
R = V / I = 1.3 / 2 = 0.65Ω
ZD = 5V10W


如果需要穩壓就非用78S05不可, 不過輸入電壓需要高一啲


圖片參考:http://www.eleccircuit.com/wp-content/uploads/2008/07/power-supply-5v-2a-by-ic-78s05.gif


圖片參考:http://www.cricklewoodelectronics.co.uk/Cricklewood/image.php?type=T&id=17597


圖片參考:http://cdn.sigma.octopart.com/499198/image/STMicroelectronics-LM217T.jpg



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