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PM6680 датащи(PDF) 42 Page - STMicroelectronics

номер детали PM6680
подробное описание детали  No Rsense dual step-down controller with adjustable voltages for notebook system power
PDF  49 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6680 датащи(HTML) 42 Page - STMicroelectronics

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Device description
PM6680
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7.13.8
Design example
The following design example considers an input voltage from 7V to 16V. The two switching
outputs are OUT1=1.5V and OUT2=1.05V and must deliver a maximum current of 5A. The
selected switching frequencies are about 290kHz for OUT1 section and about 425kHz for
OUT2 section (see Table 7 on page 30).
1.
Inductor selection
OUT1: ILOAD = 5A, 35% ripple current.
Equation 36
We choose standard value L = 2.5 uH.
∆I
L(max) = 1.8A @VIN =12V
ILRMS = 5.03A
IPEAK = 5A + 0.9A = 5.9A
OUT2: ILOAD = 5A, 30% ripple current.
Equation 37
∆I
L(max) = 1.6A @VIN = 12V.
ILRMS = 5.02A
IPEAK = 5A + 0.8A = 5.8A
2.
Output capacitor selection
We would like to have an output ripple smaller than 25mV.
OUT1: POSCAP 6TPB330M
OUT2: POSCAP 6TPB330M
3.
Power MOSFETS
OUT1: High side: STS12NH3LL
Low side: STS12NH3LL
OUT2:High side: STS12NH3LL
Low side: STS12NH3LL
4.
Current limit
OUT1:
Equation 38
H
5
.
2
5
35
.
0
V
16
KHz
290
)
V
5
.
1
V
16
(
V
5
.
1
L
µ
≈
⋅
⋅
⋅
−
⋅
=
H
6
.
1
5
3
.
0
V
16
KHz
425
)
V
05
.
1
V
16
(
V
05
.
1
L
µ
≈
⋅
⋅
⋅
−
⋅
=
A
12
.
4
2
(min)
I
(max)
I
(min)
I
L
LOAD
Lvalley
=
∆
−
=



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