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PM6681ATR датащи(PDF) 40 Page - STMicroelectronics

номер детали PM6681ATR
подробное описание детали  Dual synchronous step-down controller with adjustable LDO
PDF  47 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6681ATR датащи(HTML) 40 Page - STMicroelectronics

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Design guidelines
PM6681A
40/47
Ipeak = 2.5 A + 0.58 A = 3.08 A
OUT2 : ILOAD = 2.5 A, 35 % ripple current.
We choose standard value L = 4.7
µH.
∆I
L(max) = 0.89 A @ VIN = 24 V.
ILRMS = 2.513 A
Ipeak = 2.5 A + 0.443 A = 2.943 A
9.8.2
Output capacitor selection
We would like to have an output ripple smaller than 25 mV.
OUT1: POSCAP 4TPE150MI
OUT2: POSCAP 6TPE220M
9.8.3
Power MOSFETs
OUT1:High side: STS5NF60L
Low side: STS7NF60L
OUT2:High side: STS5NF60L
Low side: STS7NF60L
9.8.4
Current limit
OUT1:
(Let's assume the maximum temperature Tmax = 75 °C in RDS(on) calculation)
OUT2:
H
76
.
4
5
.
2
35
.
0
V
24
KHz
425
)
V
8
.
1
V
24
(
V
8
.
1
L
µ
≈
⋅
⋅
⋅
−
⋅
=
A
12
.
4
2
(min)
I
(max)
I
(min)
I
L
LOAD
Lvalley
=
∆
−
=
Ω
≈
Ω
⋅
µ
≡
670
m
25
.
16
A
100
A
12
.
4
R
CSENSE
A
2
.
4
2
(min)
I
(max)
I
(min)
I
L
LOAD
Lvalley
=
∆
−
=



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