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PM6680A 数据表(PDF) 41 Page - STMicroelectronics

部件名 PM6680A
功能描述  Dual synchronous step-down controller with adjustable output voltages plus LDO
PDF  48 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM6680A 数据表(HTML) 41 Page - STMicroelectronics

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PM6680A
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Equation 37
We choose standard value L=4.7
µH.
∆I
L(max) = 0.886 A @VIN =24 V.
ILRMS = 2.523 A
Ipeak = 2.5 A + 0.58 A = 3.83 A
2.
Output capacitor selection
We would like to have an output ripple smaller than 25 mV.
OUT1: POSCAP 4TPE150MI
OUT2: POSCAP 6TPE220M
3.
Power MOSFETs
OUT1:High side: STS5NF60L
Low side: STS7NF60L
OUT2:High side: STS5NF60L
Low side: STS7NF60L
4.
Current limit
OUT1:
Equation 38
Equation 39
(Let's assume the maximum temperature Tmax = 75 °C in RDSon calculation). We
choose standard value RCSENSE = 560 Ω.
OUT2:
Equation 40
A



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