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參數(shù)資料
| 型號： | AAT2550ISK-CAA-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Total Power Solution for Portable Applications |
| 中文描述： | 總功率便攜式應(yīng)用解決方案 |
| 文件頁數(shù)： | 26/35頁 |
| 文件大小： | 914K |
| 代理商： | AAT2550ISK-CAA-T1 |
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Step-Down Converter Losses
There are three types of losses are associated with
the AAT2550 step-down converter: switching losses
(t
SW
· F
S
), conduction losses (I
2
· R
DS(ON)
), and qui-
escent current losses (I
Q
· V
IN
). At full load, assum-
ing continuous conduction mode, a simplified form
of the step-down converter losses is:
AAT2550
Total Power Solution for Portable Applications
26
2550.2006.07.1.0
P
SD
=
+ (
t
SW
· F
S
· (
I
OA
+
I
OB
)
+ 2 ·
I
Q
) ·
V
IN
I
OA2
·
(R
DS(ON)H
· V
OA
+
R
DS(ON)L
· (V
IN
- V
OA
)) + I
OB2
·
(R
DS(ON)H
· V
OB
+
R
DS(ON)L
· (V
IN
- V
OB
))
V
IN
For the condition where one channel is in dropout
at 100% duty cycle (I
OA
), the step-down converter
dissipation is:
P
SD
V
IN
R
DS(ON)H
R
DS(ON)L
V
OA
V
OB
I
OA
I
OB
I
Q
t
SW
F
S
= Step-Down Converter Dissipation
= Converter Input Voltage
= High Side MOSFET On Resistance
= Low Side MOSFET On Resistance
= Converter A Output Voltage
= Converter B Output Voltage
= Converter A Load Current
= Converter B Load Current
= Converter Quiescent Current
= Switching Time Estimate
= Converter Switching Frequency
Always use the R
DS(ON)
and quiescent current
value that corresponds to the applied input voltage.
Battery Charger Losses
The maximum battery charger loss is:
P
C
V
ADP
= Adapter Voltage
V
MIN
= Preconditioning Voltage Threshold
I
CH
= Programmed Charge Current
I
QC
= Charger Quiescent Current Consumed by
the Charger
= Total Charger Dissipation
For an application where no load is applied to the
step-down converters and the charger current is
set to 1A with V
ADP
= 5.0V, the maximum charger
dissipation occurs at the preconditioning voltage
threshold V
MIN
.
The charger thermal loop begins reducing the
charge current at a 110°C junction temperature
(T
LOOP_IN
). The ambient temperature at which the
charger thermal loop begins reducing the charge
current is:
Therefore, under the given conditions, the
AAT2550 battery charger will enter the thermal
loop charge current reduction at an ambient tem-
perature greater than 54°C.
T
A
= T
LOOP_IN
θ
JA
· P
C
= 110°C - (28°C/W) · 2W
= 54°C
P
C
= (V
ADP
- V
MIN
) · I
CH
+ V
ADP
· I
QC
= (5.0V - 3.0V) · 1A + 5.0V · 0.74mA
= 2W
P
C
= (V
ADP
- V
MIN
) · I
CH
+ V
ADP
· I
QC
P
SD
=
I
OA2
·
R
DS(ON)H
+ (
t
SW
· F
S
·
I
OB
+ 2 ·
I
Q
) ·
V
IN
+
I
OB2
·
(R
DS(ON)H
· V
OB
+
R
DS(ON)L
· (V
IN
- V
OB
))
V
IN
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| AAT2550 | Total Power Solution for Portable Applications |
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| AAT2554IRN-CAP-T1 | Total Power Solution for Portable Applications |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2552 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2552_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
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| AAT2554 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2554IRN-CAP-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
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