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參數(shù)資料
| 型號： | AAT1230 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 18V 100mA Step-Up Converter |
| 中文描述： | 18V的100mA的升壓轉換器 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大?。?/td> | 491K |
| 代理商： | AAT1230 |
AAT1230
18V 100mA Step-Up Converter
10
1230.2006.03.1.0
Application Information
Selecting the Output Diode
To ensure minimum forward voltage drop and no
recovery, high voltage Schottky diodes are consid-
ered the best choice for the AAT1230 boost convert-
er. The AAT1230 output diode is sized to maintain
acceptable efficiency and reasonable operating
junction temperature under full load operating condi-
tions. Forward voltage (V
F
) and package thermal
resistance (
θ
JA
) are the dominant factors to consider
in selecting a diode. The diode's published current
rating may not reflect actual operating conditions
and should be used only as a comparative measure
between similarly rated devices. 20V rated Schottky
diodes are recommended for outputs less than 15V,
while 30V rated Schottky diodes are recommended
for outputs greater than 15V.
The switching period is divided between ON and
OFF time intervals.
During the ON time, the N-channel power MOS-
FET is conducting and storing energy in the boost
inductor. During the OFF time, the N-channel
power MOSFET is not conducting. Stored energy is
transferred from the input battery and boost induc-
tor to the output load through the output diode.
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.
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
= T
ON
+ T
OFF
1
F
S
Figure 1: AAT1230 Demo Board Schematic.
V
CC
C1
2.2μF
L1
2.2μH
R1
78.7k
R2
562
R3
4.99k
V
OUT
1
2
3
Enable
JP1
R4
10K
C2
2.2μF
25V
1
2
3
Select
JP2
D1
Schottky
N/C
SW
5
6
VP
EN/SET
SEL
VIN
1
2
3
4
PGND
SW
8
7
GND
9
FB2
10
FB1
11
LIN
12
U1 AAT1230
TSOPJW-12
C1 10V 0805 2.2μF
C2 25V 0805 2.2μF
D1 30V 0.5A MBR0530T1 SOD-123
L1 2.2μH SD3814-2R2
R1 78.7k 0603
R2 562 0603
R3 4.99k 0603
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1230_0610 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:18V 100mA Step-Up Converter |
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