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參數(shù)資料
| 型號： | AAT1112IWP-0.6-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 1.5A, 1.4MHz Step-Down Converter |
| 中文描述： | 1.5A的，1.4MHz的降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 828K |
| 代理商： | AAT1112IWP-0.6-T1 |
AAT1112
1.5A, 1.4MHz Step-Down Converter
12
1112.2007.01.1.1
Component Selection
Inductor Selection
The step-down converter uses peak current mode
control with slope compensation to maintain stabil-
ity for duty cycles greater than 50%. The output
inductor value must be selected so the inductor
current down slope meets the internal slope com-
pensation requirements. The inductor should be
set equal to the output voltage numeric value in μH.
This guarantees that there is sufficient internal
slope compensation.
Manufacturer's specifications list both the inductor
DC current rating, which is a thermal limitation, and
the peak current rating, which is determined by the
saturation characteristics. The inductor should not
show any appreciable saturation under normal load
conditions. Some inductors may meet the peak and
average current ratings yet result in excessive loss-
es due to a high DCR. Always consider the losses
associated with the DCR and its effect on the total
converter efficiency when selecting an inductor.
The 3.3μH CDRH4D28 series Sumida inductor has
a 49.2m
Ω
worst case DCR and a 1.57A DC current
rating. At full 1.5A load, the inductor DC loss is
97mW which gives less than 1.5% loss in efficien-
cy for a 1.5A, 3.3V output.
Input Capacitor
Select a 10μF to 22μF X7R or X5R ceramic capac-
itor for the input. To estimate the required input
capacitor size, determine the acceptable input rip-
ple level (V
PP
) and solve for C. The calculated
value varies with input voltage and is a maximum
when V
IN
is double the output voltage.
Always examine the ceramic capacitor DC voltage
coefficient characteristics when selecting the prop-
er value. For example, the capacitance of a 10μF,
6.3V, X5R ceramic capacitor with 5.0V DC applied
is actually about 6μF.
C
IN(MIN)
=
1
- ESR
·
4
·
F
S
I
O
V
PP
· 1
-
= 1
IN
= 2
·
V
O
V
IN
V
IN
V
O
4
· 1
-
V
O
V
IN
C
IN
=
V
O
V
IN
- ESR
·
F
S
V
PP
I
O
Figure 1: AAT1112 Schematic.
PGND
1
FB
6
VP
11
LX
12
EN
8
N/C
4
PGND
3
PGND
2
VCC
7
SYNC
9
GND
5
N/C
10
AAT1112
TDFN33-12
U1
V
IN
3.3V
1
2
3
Enable
10μF
C1
22μF
C2
R2
59K
R3
(optional)
C3
3.3μH
L1
1
2
3
SYNC
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