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參數(shù)資料
| 型號： | HWD20011EUA |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
| 中文描述： | 高效率，低電源電流，結(jié)構(gòu)緊湊，升壓型DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 787K |
| 代理商： | HWD20011EUA |
H
LBI and
LBO
. For V
TRIP
less than 1.3V, configure the
comparator as shown in Figure 8. Calculate the value of
the external resistors R3 and R4 as follows:
R3 = R4(V
REF
- V
TRIP
) / (V
OUT
- V
REF
)
Since the low-battery comparator is noninverting, exter-
nal hysteresis can be added by connecting a resistor
between
LBO
and LBI as shown in Figure 9. When
LBO
is high, the series combination of R2 and R7 source
current into the LBI summing junction.
Applic ations Information
Induc tor S elec tion
An inductor value of 22μH performs well in most appli-
cations. The
HWD20011/HWD2001/HWD20012
will
also
work with inductors in the 10μH to 47μH range. Smaller
inductance values typically offer a smaller physical size
for a given series resistance, allowing the smallest
overall circuit dimensions. However, due to higher peak
inductor currents, the output voltage ripple (I
PEAK
x
output filter capacitor ESR) also tends to be higher.
Circuits using larger inductance values exhibit higher
output current capability and larger physical dimen-
sions for a given series resistance. The inductor’s incre-
mental saturation current rating should be greater than
the peak switch-current limit, which is 1A for the
HWD20011
, 500mA for the
HWD2001
, and 1A or 0.5A for
the
HWD20012
. However, it is generally acceptable to
bias the inductor into saturation by as much as 20%,
although this will slightly reduce efficiency. Table 1 lists
suggested components.
The inductor’s DC resistance significantly affects effi-
ciency. See Table 2 for a comparison of inductor speci-
fications. Calculate the maximum output current as
follows:
where I
OUT(MAX)
= maximum output current in amps
V
IN
= input voltage
L = inductor value in μH
η
= efficiency (typically 0.9)
t
OFF
= LX switch’s off-time in μs
I
LIM
= 0.5A or 1.0A
I
V
V
I
t
V
V
x L
OUT MAX
IN
OUT
LIM
OFF
OUT
2
IN
)
=
–
–
η
High-Effic ienc y, Low-S upply-Current,
Compac t, S tep-Up DC-DC Converters
10
HWD20011
HWD2001
HWD20012
BATT
(HWD20012)
V
IN
LBI
REF
GND
R3
R1
200
R4
22
μ
H
47
μ
F
0.1
μ
F
LX
LBO
V
OUT
FB
R2
100k
SHDN
OUT
CLSEL
(HWD20012)
LOW-
BATTERY
OUTPUT
0.1
μ
F
47
μ
F
Figure 8. Setting Resistor Values for the Low-Battery Indicator
when V
IN
< 1.3V
HWD20011
HWD2001
HWD20012
LBI
GND
V
TRIP
(V
H
, V
L
)
R3
R4
R7
V
H
IS THE UPPER TRIP LEVEL
V
L
IS THE LOWER TRIP LEVEL
WHERE
R2
100k
LBO
OUT
V
OUT
0.1
μ
F
47
μ
F
V = 1.3V
V = 1.3V
)
+
+
)
+
+
(
.
) (
R
)
R
( .
1 3
)
1
3
7
3
4
1
3
4
1 3
2
3
7
R
R
R
R
R
R
V
V R
V
OUT
Figure 9. Adding External Hysteresis to the Low-Battery
Indicator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HWD20012 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
| HWD20012EUB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
| HWD2001EUA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
| HWD210 | 制造商:NTE Electronics 功能描述: |
| HWD2108 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Dual 105 mW Headphone Amplifier |
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