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參數(shù)資料
| 型號(hào)： | LT1513IT7-2 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| 中文描述： | 5.4 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PSFM7 |
| 封裝： | PLASTIC, TO-220, 7 PIN |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 299K |
| 代理商： | LT1513IT7-2 |
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12
LT1513/LT1513-2
APPLICATIO
S I
FOR
ATIO
U
The suggested way to control unity loop frequency is to
increase the filter time constant on the I
FB
pin (R4/C4 in
Figures 1 and 7). The filter resistor cannot be arbitrarily
increased because high values will affect charging current
accuracy. Charging current will increase by 1% for each
40
increase in R4. There is no inherent limitation on the
value of C4, but if this capacitor is ceramic, it should be an
X7R type to maintain its value over temperature. X7R
dielectric requires a larger footprint.
The formula for calculating the minimum value for the filter
capacitor C4 is:
W
U
U
C
R
(
V
R
( )(
π
V
V
IN
IN
BAT
4
3 4
2
12 1500
)(
)(
5
4
=
+
)(
)
)
μ
V
IN
= Highest input voltage
1500
μ
= Transconductance of error amplifier
(EA)f = Desired unity-gain frequency
V
BAT
= Battery voltage
For example, assume V
IN(MAX)
= 15V, R3 = 0.4
(charging
current set to 0.25A), R4 = 24
, R5 = 330
and V
BAT
= 8V,
C
F
4
0 4 4 15 12 0 0015 330
6.3(25000)(39)(
15 8
1
=
=
)
)
μ
The value for C4 could be reduced to a more manageable size
by increasing R4 to 75
and reducing R5 to 300
, yielding
0.47
μ
F for C4. The 2% increase in charging current can be
ignored or factored into the value for R3.
More Help
Linear Technology Field Application Engineers have a CAD
spreadsheet program for detailed calculations of circuit
operating conditions. In addition, our Applications Depart-
ment is always ready to lend a helping hand. The LT1371
data sheet may also be helpful. The LT1513 is identical
except for the current amplifier circuitry.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1513CT7-2 | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger |
| LT1513 | SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger(初級(jí)線圈感應(yīng)轉(zhuǎn)換，恒定電流或可編程電流/恒定電壓電池充電器) |
| LT1521-3 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1521-3.3 | Paired Cable; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes RoHS Compliant: Yes |
| LT1521IST-3.3 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT-1514-110-006 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1514-110-012 | 制造商:Carling Technologies 功能描述:SINGLE-POLE, LIGHTED TOGGLE, RED LENS - Bulk |
| LT-1514-110-024 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1514-110-125 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1514-112-012 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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