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參數(shù)資料
| 型號： | AAT2503IZL-BAA-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Adjustable 3-Channel Regulator |
| 中文描述： | 可調(diào)節(jié)的3通道穩(wěn)壓器 |
| 文件頁數(shù)： | 14/23頁 |
| 文件大小： | 1022K |
| 代理商： | AAT2503IZL-BAA-T1 |
AAT2503
Adjustable 3-Channel Regulator
14
2503.2007.04.1.1
Applications Information
Step-Down Converter Inductor Selection
The step-down converter uses peak current mode
control with slope compensation to maintain stability
for duty cycles greater than 50%. The output induc-
tor value must be selected so the inductor current
down slope meets the internal slope compensation
requirements. The internal slope compensation for
the AAT2503 step-down converter is 0.51A/μsec.
This equates to a slope compensation that is 75% of
the inductor current down slope for a 1.5V output
and 2.2μH inductor.
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 2.2μH CDRH2D14 series Sumida inductor has
a 94m
Ω
DCR and a 1.5A DC current rating. At full
800mA load, the inductor DC loss is 17mW which
gives a 2.8% loss in efficiency for a 800mA, 1.8V
output.
Input Capacitor
Select a 4.7μF to 10μF X7R or X5R ceramic capac-
itor for the input of the step-down converter. To esti-
mate the required input capacitor size, determine
the acceptable input ripple level (V
PP
) and solve for
C
IN
. 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.
The maximum input capacitor RMS current is:
The input capacitor RMS ripple current varies with
the input and output voltage and will always be less
than or equal to half of the total DC load current.
0.75
V
m = L
0.75
1.5V
2.2
μ
H
A
μ
sec
I
RMS
= I
O
· · 1
-
V
IN
O
V
O
V
IN
C
IN(MIN)
=
1
- ESR
·
4
·
F
S
I
O
V
PP
· 1
-
= 1
IN
= 2 · V
O
V
IN
V
IN
O
V
O
4
· 1
-
V
O
V
IN
C
IN
=
V
O
V
IN
- ESR
·
F
S
V
PP
I
O
· 1
-
= D
· (1 - D) = 0.5
2
=
V
IN
V
O
V
IN
O
1
2
Table 1: Inductor Values.
Configuration
Output Voltage
1V, 1.2V
1.5V, 1.8V
2.5V, 3.3V
Inductor
1.5μH
2.2μH
3.3μH
0.9V Adjustable With
External Feedback
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