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參數(shù)資料
| 型號(hào)： | MAX2003A |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Fast-Charge Battery Chargers(NICD/NIMH,可充電池?cái)?shù)1~16個(gè),電池快速充電器) |
| 中文描述： | 快速充電電池充電器（鎳鎘/鎳氫電池，可充電池?cái)?shù)1?16個(gè)，電池快速充電器） |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 191K |
| 代理商： | MAX2003A |
M
From solving these simultaneous equations:
R
T2
= [(X) (R
NTC10
) - (R
NTC50
)] / (1 - X)
R
T1
= [(R
T2
) (R
NTC10
) (V
CC
- V
TS10
)] / [V
TS10
(R
T2
+
R
NTC10
)].
NTC50
)(V
TS10
)(V
CC
- V
TS50
)]
where X =[(R
[(R
NTC10
) (V
TS50
) (V
CC
- V
TS10
)]
Using R
NTC50
= 4.16k
, R
NTC10
= 17.96k
, V
TS50
=
1.72V, and V
TS10
= 2.00V, it can be calculated that R
T1
= 1.599k
and R
T2
= 2.303k
.
Select preferred resistor values for R
T1
(2.21k
) and
R
T2
(1.62k
). The actual voltages on MCV and TCO
can be verified as follows:
(
(
(
=
(
(
(
=
7) Select Maximum Cell Voltage (MCV) and
Temperature Cutoff (TCO)
. The MCV and TCO can be
selected with a resistor-divider combination (Figure 9).
In our example, TCO has been set to +10°C, which cor-
responds to a voltage of 1.72V at the TS pin. The MCV
for most fast-charge batteries can be set to about 1.9V.
To minimize the current load on V
CC
, choose R1 in the
range of 20k
to 200k
. In this example, choose R1 =
60.4k
, then calculate R3 and R2 as follows:
R3 = (V
TCO
x R1) / (V
CC
- V
MCV
) = 33.5k
(1%)
and
R2 = (V
MCV
x R1) / (V
CC
- V
MCV
) - R3 = 3.51k
(1%)
Select preferred resistor values for R2 (3.48k
) and R3
(33.2k
). The actual voltages on MCV and TCO can be
verified as follows :
V
TCO
= V
CC
(R3) / (R1 + R2 + R3) = 1.71V
and
V
MCV
= V
CC
(R2 + R3) / (R1 + R2 + R3) = 1.89V.
8) Select Trickle Resistor (MAX2003 only).
The trick-
le resistor (R
TR
) is selected to allow a trickle-charge
rate of C/16 to C/40. The resistor value is given by:
R
TR
= (V
DC
- V
BAT
) / I
TR
where I
TR
is the required trickle current, V
DC
is the DC
supply voltage, and V
BAT
is the number of cells times
the cell voltage after fast-charge.
In our example, the 1700mAh NiMH battery needs a
trickle current of C/40; i.e., 42mA (1700mAh/40h).
Therefore, the minimum voltage (from the formula
above) is as follows:
R
TR
= [13.0V - (6 x 1.2V)] / 42mA
≈
150
The maximum power dissipated in the resistor can be
calculated by:
Power = (V
DC
- V
BAT(MIN)
)
2
/ R
TR
where V
BAT(MIN)
is the minimum cell voltage, V
DC
is the
DC supply voltage, and R
TR
is the trickle resistor value.
Since a shorted battery could have 0V, this must be the
minimum cell voltage possible. Therefore the power
dissipated in the trickle resistor would be:
Power = (13 - 0)
2
/ 150 = 1.2W
A 2W, 150
resistor should be sufficient for the trickle-
charge resistor. For the MAX2003A, refer to Trickle-
Charge section.
9) Select Inductor
. The inductor value can be calcu-
lated using the formula:
V
L
= L
δ
i /
δ
t
where V
L
is the maximum voltage across the inductor, L
is the minimum inductor value,
δ
i is the change in induc-
tor current, and t is the minimum on-time of the switch.
V
V
R
II R
R
II R
R
5 1.62k II 17.96k
1.62k II 17.96k
2.21k
2.01V
V
V
R
II R
R
II R
R
5 1.62k II 4.16k
1.62k II 4.16k
2.21k
1.72V.
TS10
CC
T2
NTC10
)
+
T2
NTC10
T1
TS50
CC
T2
NTC50
)
+
T2
NTC50
T1
=
)
[
]
=
)
)
+
[
]
=
)
[
]
)
=
)
+
[
]
NiCd/NiMH Battery Fast-Charge Controllers
14
______________________________________________________________________________________
I
LOAD
I
MAX
= 1.9A
I
C
I
MIN
= 1.5A
TIME
δ
i = I
MAX
- I
MIN
T
OFF
T
ON
Figure 10. Inductor-Current Waveform in Continuous-
Conduction Mode
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MAX2003AC/D | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:NiCd/NiMH Battery Fast-Charge Controllers |
| MAX2003ACPE | 制造商:Maxim Integrated Products 功能描述: |
| MAX2003ACSE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX2003ACWE | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:NiCd/NiMH Battery Fast-Charge Controllers |
| MAX2003ACWE+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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