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參數(shù)資料
| 型號(hào)： | AAT1270IFO-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 1A Step-Up Current Regulator for Flash LEDs |
| 中文描述： | 第1A升壓電流調(diào)節(jié)器的閃光燈發(fā)光二極管 |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大?。?/td> | 734K |
| 代理商： | AAT1270IFO-T1 |
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AAT1270
1A Step-Up Current Regulator for Flash LEDs
1270.2007.07.1.0
13
Selecting the Boost Inductor
The AAT1270 controller utilizes PWM control and
the switching frequency is fixed. To maintain 2MHz
maximum switching frequency and stable opera-
tion, an 1μH output inductor is recommended.
Manufacturer’s specifications list both the inductor
DC current rating, which is a thermal limitation, and
peak inductor current rating, which is determined
by the saturation characteristics. Measurements at
full load and high ambient temperature should be
performed to ensure that the inductor does not sat-
urate or exhibit excessive temperature rise.
The output inductor (L) is selected to avoid satura-
tion at minimum input voltage and maximum output
load conditions. Worst-case peak current occurs at
minimum input voltage (maximum duty cycle) and
maximum load.
At high load the switching frequency is somewhat
diminished, resulting in higher I
PEAK
. Bench meas-
urements are recommended to confirm actual I
PEAK
and to ensure that the inductor does not saturate at
maximum LED current and minimum input supply
voltage.
The RMS current flowing through the boost induc-
tor is equal to the DC plus AC ripple components.
Under worst-case RMS conditions, the current
waveform is critically continuous. The resulting
RMS calculation yields worst-case inductor loss.
The RMS current value should be compared
against the inductor manufacturer's temperature
rise, or thermal derating, guidelines:
For a given inductor type, smaller inductor size leads
to an increase in DCR winding resistance and, in
most cases, increased thermal impedance. Winding
resistance degrades boost converter efficiency and
increases the inductor’s operating temperature:
Selecting the Boost Capacitors
In general, it is good design practice to place a
decoupling capacitor (input capacitor) between the
IN and GND pins. An input capacitor in the range of
2.2μF to 10μF is recommended. A larger input
capacitor in this application may be required for sta-
bility, transient response, and/or ripple performance.
The high output ripple inherent in the boost con-
verter necessitates the use of low impedance out-
put filtering. Multi-layer ceramic (MLC) capacitors
provide small size and adequate capacitance, low
parasitic equivalent series resistance (ESR) and
equivalent series inductance (ESL), and are well
suited for use with the AAT1270 boost regulator.
MLC capacitors of type X7R or X5R are recom-
mended to ensure good capacitance stability over
the full operating temperature range.
P
LOSS(INDUCTOR)
= I
RMS2
· DCR
I
PEAK
3
RMS
I
=
Table 2: Typical Suggested Surface Mount Inductors
Max
DC I
Current (A)
1.6
1.58
1.6
1.47
3.89
2.8
Inductance
(μH)
1.0
1.0
1.0
1.0
1.0
1.0
DCR
(m)
55
110
85
68.3
30
39
Size (mm)
(LxWxH)
2.5x2.0x0.9
3.0X3.0x1.0
3.0x3.0x1.0
3.1x3.1x1.0
4.0x4.0x1.2
4.0x4.0x1.2
Manufacturer
Murata
Murata
CoilCraft
Cooper Bussmann
Cooper Bussmann
Sumida
Part Number
LQM2HPN1R0MG0
LQH3NPN1R0G0
LPS3010
SD3110
SD3812
CDH38D11/S
Type
Multilayer
Wirewound
Wirewound
Wirewound
Wirewound
Wirewound
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