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參數(shù)資料
| 型號(hào)： | AAT1231ITP-1-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Step-Up DC/DC Converters for White LED Backlight Applications |
| 中文描述： | 升壓型DC / DC轉(zhuǎn)換器，用于白光LED背光應(yīng)用 |
| 文件頁(yè)數(shù)： | 18/27頁(yè) |
| 文件大?。?/td> | 1535K |
| 代理商： | AAT1231ITP-1-T1 |
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AAT1231/1231-1
Step-Up DC/DC Converters for
White LED Backlight Applications
18
1231.2007.01.1.2
Duty cycle is defined as the ON time divided by the
total switching interval.
The maximum duty cycle can be estimated from
the relationship for a continuous mode boost con-
verter. Maximum duty cycle (D
MAX
) is the duty cycle
at minimum input voltage (V
IN(MIN)
).
The average diode current during the OFF time can
be estimated.
The following curves show the V
F
characteristics
for different Schottky diodes (100°C case). The V
F
of the Schottky diode can be estimated from the
average current during the off time.
The average diode current is equal to the output
current.
The average output current multiplied by the for-
ward diode voltage determines the loss of the out-
put diode.
For continuous LED currents, the diode junction
temperature can be estimated.
T
J(DIODE)
= T
AMB
+
θ
JA
· P
LOSS(DIODE)
P
LOSS(DIODE)
= I
AVG(TOT)
·
V
F
= I
OUT
·
V
F
I
AVG(TOT)
= I
OUT
Forward Voltage (V)
F
10
100
1000
10000
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
B340LA
MBR0530T
ZHCS350
BAT42W
I
OUT
1 - D
MAX
I
AVG(OFF)
=
V
OUT
- V
IN(MIN)
V
OUT
D
MAX
=
T
ON
T
ON
+ T
OFF
D =
= T
ON
F
S
Table 4: Typical Surface Mount Schottky Rectifiers for Various Output Levels.
Rated
Forward
Current (A)
Non-Repetitive
Peak Surge
Current (A)
Thermal
Resistance
(
θ
JA
, °C/W)
25
500
206
330
500
Part
Number
Rated
Voltage (V)
Manufacturer
Case
Diodes, Inc.
Diodes, Inc.
ON Semi
Zetex
Central Semi
B340LA
BAT42W
MBR0530T
ZHCS350
CMDSH2-3
3
70.0
4.0
5.5
4.2
1.0
40
30
30
40
30
SMA
SOD-123
SOD-123
SOD-523
SOD-323
0.2
0.5
0.35
0.2
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