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參數(shù)資料
| 型號： | PM6680TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32 |
| 文件頁數(shù)： | 37/49頁 |
| 文件大?。?/td> | 2931K |
| 代理商： | PM6680TR |
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Device description
PM6680
42/49
7.13.8
Design example
The following design example considers an input voltage from 7 V to 16 V. The two switching
outputs are OUT1=1.5 V and OUT2=1.05 V and must deliver a maximum current of 5 A. The
selected switching frequencies are about 290 kHz for OUT1 section and about 425 kHz for
OUT2 section (see Table 7 on page 30).
1.
Inductor selection
OUT1: ILOAD = 5 A, 35 % ripple current.
Equation 36
We choose standard value L = 2.5 uH.
I
L(max) = 1.8 A @VIN =12 V
ILRMS = 5.03 A
IPEAK = 5 A + 0.9 A = 5.9 A
OUT2: ILOAD = 5 A, 30 % ripple current.
Equation 37
I
L(max) = 1.6 A @VIN = 12 V.
ILRMS = 5.02 A
IPEAK = 5 A + 0.8 A = 5.8 A
2.
Output capacitor selection
We would like to have an output ripple smaller than 25 mV.
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
≈
=
H
6
.
1
5
3
.
0
V
16
KHz
425
)
V
05
.
1
V
16
(
V
05
.
1
L
≈
=
A
12
.
4
2
(min)
I
(max)
I
(min)
I
L
LOAD
Lvalley
=
=
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