AAT1161 查看數據表（PDF） - Analog Technology Inc
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AAT1161 Datasheet PDF : 18 Pages
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PRODUCT DATASHEET
AAT1161
13.2V Input, 3A Step-Down Converter
Input Capacitor
Input Ripple VPP = 50mV
CIN =
1
⎛
⎝
VPP
ILOAD
-
ESR⎞⎠ · 4
· FOSC
=
⎛ 50mV
⎝ 3A
1
- 5mΩ⎞⎠ · 4 · 800kHz
= 26µF; use 22µF
I = RMS(MAX)
ILOAD
2
=
1.5Arms
P = esr · IRMS2 = 5mΩ · (1.5A)2 = 11.25mW
AAT1161 Losses
Total losses can be estimated by calculating at the nominal input voltage (12V). All values assume an 85°C ambient
temperature and a 140°C junction temperature with the TDFN 50°C/W package.
RDS(ON) = 0.18Ω
tSW = 5ms
IQ = 300µA
PLOSS
=
ILOAD2
·
(RDS(ON)
VIN
·
VOUT)
+ [(tsw · FOSC · ILOAD + IQ) · VIN]
PLOSS = 823mW
TJ(MAX) = TAMB + ΘJA · PLOSS = 85°C + (50°C/W) · 0.823W = 126°C
16
www.analogictech.com
1161.2008.03.1.0
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