參數(shù)資料
型號(hào)： AAT1239ITP-1-T1
廠商： Advanced Analogic Technologies, Inc.
英文描述： 40V Step-Up Converter for 4 to 10 White LEDs
中文描述： 40V的升壓轉(zhuǎn)換器為4至10個(gè)白光LED
文件頁(yè)數(shù)： 16/21頁(yè)
文件大?。?/td> 915K
代理商： AAT1239ITP-1-T1
AAT1239-1
40V Step-Up Converter for 4 to 10 White LEDs
SwitchReg
TM
PRODUCT DATASHEET
16
1239-1.2007.10.1.0
w w w . a n a l o g i c t e c h . c o m
The maximum duty cycle can be estimated from the
relationship for a continuous mode boost converter.
Maximum duty cycle (D
MAX
) is the duty cycle at minimum
input voltage (V
IN(MIN)
).
V
OUT
- V
IN(MIN)
V
OUT
D
MAX
=
The average diode current is equal to the output
current.
I
AVG(TOT)
= I
OUT
The average output current multiplied by the forward
diode voltage determines the loss of the output diode.
P
LOSS(DIODE)
= I
AVG(TOT)
·
V
F
= I
OUT
·
V
F
For continuous LED currents, the diode junction tem-
perature can be estimated.
T
J(DIODE)
= T
AMB
+
θ
JA
· P
LOSS(DIODE)
Output diode junction temperature should be maintained
below 110oC, but may vary depending on application
and/or system guidelines. The diode
θ
JA
can be mini-
mized with additional PCB area on the cathode. PCB
heat-sinking the anode may degrade EMI performance.
The reverse leakage current of the rectifier must be con-
sidered to maintain low quiescent (input) current and
high efficiency under light load. The rectifier reverse cur-
rent increases dramatically at elevated temperatures.
Selecting the Boost Inductor
The AAT1239-1 controller utilizes hysteretic control and
the switching frequency varies with output load and
input voltage. The value of the inductor determines the
maximum switching frequency of the boost converter.
Increased output inductance decreases the switching
frequency, resulting in higher peak currents and increased
output voltage ripple. To maintain 2MHz maximum
switching frequency and stable operation, an output
inductor sized from 1.5
μ
H to 2.7
μ
H is recommended.
A better estimate of D
MAX
is possible once V
F
is known.
(V
OUT
+ V
F
- V
IN(MIN)
)
(V
OUT
+ V
F
)
D
MAX
=
Where V
F
is the Schottky diode forward voltage. If not
known, it can be estimated at 0.5V.
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 satu-
ration characteristics. Measurements at full load and
high ambient temperature should be completed to
ensure that the inductor does not saturate or exhibit
excessive temperature rise.
Manufacturer
Part Number
SS16L
SS15L
SS14L
B340LA
ZHCS350
Rated
Forward
Current
(A)
Non-Repetitive
Peak Surge
Current (A)
30
30
30
70.0
4.2
Rated
Voltage
(V)
60
50
40
40
40
Thermal
Resistance
(
θ
JA
, °C/W)
45
45
45
25
330
Size (mm)
(LxWxH)
3.8x1.9x1.43
3.8x1.9x1.43
3.8x1.9x1.43
5.59x2.92x2.30
1.7x0.9x0.8
Case
Sub SMA
Sub SMA
Sub SMA
SMA
SOD523
Taiwan Semiconductor
Co., Ltd.
1.1
Diodes, Inc
Zetex
3
0.35
Table 3: Typical Surface Mount Schottky Rectifiers for Various Output Levels.
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