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PM6685 데이터시트(PDF) 45 Page - STMicroelectronics

부품명 PM6685
상세설명  Dual step-down main supply controller with auxilary voltages for notebook system power
PDF  52 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6685 데이터시트(HTML) 45 Page - STMicroelectronics

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PM6685
Design example
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10
Design example
The following design example considers an input voltage from 7V to 16V. The two switching
outputs must deliver a maximum current of 5A. The selected switching frequencies are
200kHz for the 5V section and 300kHz for the 3.3V section.
10.1
Inductor selection
OUT5: ILOAD= 5A, 60% ripple current.
Equation 34
We choose standard value L = 6 uH
∆I
L(max) = 2.86A @VIN =16V
ILRMS = 5.07A
Ipeak = 5A + 0.95A = 6.43A
OUT3: ILOAD = 5A, 50% ripple current.
Equation 35
We choose standard value L=4 uH.
∆I
L(max) = 2.2A @VIN =16V
ILRMS = 5.04A
Ipeak = 5A + 1.1A = 6.1A
10.2
Output capacitor selection
We would like to have an output ripple greater than 35mV.
OUT5: POSCAP 6TPB330M
OUT3: POSCAP 6TPB330M
H
7
.
5
5
6
.
0
V
16
KHz
200
)
V
5
V
16
(
V
5
L
µ
≈
⋅
⋅
⋅
−
⋅
=
H
52
.
3
5
5
.
0
V
16
KHz
300
)
33
.
3
16
(
33
.
3
L
µ
≈
⋅
⋅
⋅
−
⋅
=



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