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參數(shù)資料
| 型號： | AAT1230_0610 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 18V 100mA Step-Up Converter |
| 中文描述： | 18V的100mA的升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大?。?/td> | 511K |
| 代理商： | AAT1230_0610 |
AAT1230/1230-1
18V 100mA Step-Up Converter
10
1230.2006.10.1.4
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 AAT1230/1230-1 boost
converter. The AAT1230/1230-1 output diode is
sized to maintain acceptable efficiency and reason-
able operating junction temperature under full load
operating conditions. 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 oper-
ating conditions and should be used only as a com-
parative 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: AAT1230/1230-1 Demo Board Schematic.
LIN
FB1
FB2
GND
PGND
SW
12
11
10
9
8
7
SW
6
N/C
5
VIN
4
SEL
3
EN/SET
2
VP
1
U1
1
2
3
JP1
1
2
3
JP2
VIN
U1 AAT1230/1230-1 TSOPJW12
C1 10V 0603 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
L1
2.2μH
D1
Schottky
R1
78.7k
C2
2.2μF
C1
2.2μF
VOUT
R2
562
R3
4.99k
R4
10K
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