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PDF AIC1784 Data sheet ( Hoja de datos )
| Número de pieza | AIC1784 | |
| Descripción | Battery Charge Controller | |
| Fabricantes | Analog Intergrations Corporation | |
| Logotipo |  |
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FEATURES
Fast Charge Control of NiMH/NiCd Batteries,
even with a Fluctuating Charging Current.
Fast Charge Termination by: ∆T / ∆t , −∆V ,
0∆V , Safety T imer, Maxim um T emperature,
Maximum Voltage.
Linearly Adjustable ∆T / ∆t Detection Slope and
Safety Timer.
Protection against Battery Voltage and Battery
Temperature Faults.
Pulsed Trickle Charge Modes.
Quick and Easy Testing for Production.
8-pin DIP or SO Packages.
APPLICATIONS
Battery Fast Chargers for:
Mobile Phones.
Notebook and Laptop Personal Computers.
Portable Power Tools and Toys.
Portable Communication Equipments.
Portable Video & Stereo Equipments.
1.55
Charge Current = 600 mA
Cell Capacity = 550 mA
NiMH Battery
1.45
100
80
Cell Voltage
1.35
60
1.25
Temperature
1.15 0
10 20 30 40 50
Charge Time (min.)
40
20
60
Fig. 1
Battery Charging Characteristics Resulting from
an AIC1784-Controlled C harger with a
Fluctuating Charging Current
AIC1784
Battery Charge Controller
DESCRIPTION
The AIC1784 fast charge controller IC is designed
for intelligent charging of NiMH or NiCd batteries
without the risk of overcharg e. −∆V Detection
(-0.25%), 0∆V detection (peak voltage timer) and
∆T / ∆t detection a re the primary methods
employed by the AIC1784 to terminate fast charge.
The fast charge can also be cut off by maximum
battery voltage and maximum battery temperature
detection along with the safety timer to prevent
charging under fault conditions of the charging
system or the battery itself.
Both ∆T / ∆t and −∆V detection me thods h ave
been p roved powerful in termin ating fa st cha rging
for NiMH and NiCd batteries. The AIC1784 utilizes
the combin ation of these two method s to achiev e
reliable decision of ending fast charge a nd prevent
misacting ca used by using −∆V detection alone
under certain conditions. Fig. 1 shows an example
of charging curve of a battery charged by a
fluctuating current from a NiMH battery charger,
which uses the AIC1784 controller IC to achieve
optimal charging. This technique, in cooperating
with the 0∆V detection (pe ak volt age timer), is
particularly suitable for NiMH batteries, whose
voltage drop is hardly significant yet temperature
rises rapidly.
The safety timer period is adjustable. Test mode is
provided for charger manufactures to dramatically
reduce production test time.
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
DS-1784P-01 072006
1
http://www.Datasheet4U.com
1 page  
AIC1784
TYPICAL PERFORMANCE CHARACTERISTICS (TA=25°C, R2=5.1KΩ,
VCC=5V, refer to Test Circuit)
1.08
81.5
81.0
1.02
80.5
80.0
0.96
79.5
0.90
79.0
78.5
0.84
4.4 4.6 4.8 5.0 5.2 5.4
VCC (V)
Fig.2 Supply Current vs. Supply Voltage
78.0
4.4 4.6 4.8 5.0 5.2 5.4
VCC (V)
Fig.3 Safety Timer vs. Supply Voltage
5.6
1.05
1.00
0.95
0.90
0.85
0.80
0
20 40 60 80
Temperature (°C)
Fig.4 Supply Current vs. Temperature
82
81
80
79
78
77
76
75
0 20 40 60 80
Temperature (°C)
Fig.5 Safety Timer vs. Temperature
2.80
0.20
2.76
0.18
2.72
0.16
2.68
2.64
0.14
2.60
0
20 40 60
Temperature (°C)
Fig.6 VBT (High) Limit vs. Temperature
80
0.12
0
20 40 60
Temperature (°C)
Fig.7 VBT (Low) Limit vs. Temperature
(During Initial Timer)
80
5
5 Page 
AIC1784
TABLE 2 Values of Rx and Ry at TL = 0°C
TH (°C)
50
Rx(KΩ)
10.1
Ry (KΩ)
551.1
51 9.7 300.7
52 9.4 204.8
53 9.0 153.9
54 8.7 122.8
55 8.4 101.8
56 8.1 86.5
57 7.8 75.0
58 7.5 66.0
59 7.2 58.7
60 7.0 52.8
61 6.8 47.8
62 6.5 43.6
63 6.3 39.9
64 6.1 36.8
65 5.9 34.0
66 5.7 31.6
67 5.5 29.5
68 5.3 27.5
69 5.2 25.8
70 5.0 24.3
TABLE 3 Values of Rx and Ry at TL = -10°C
TH (°C)
45
Rx (KΩ)
11.4
Ry (KΩ)
95.6
46 11.0 85.0
47 10.6 76.2
48 10.2 68.9
49 9.8 62.8
50 9.5 57.5
51 9.1 52.9
52 8.8 48.8
53 8.5 45.3
54 8.2 42.1
55 7.9 39.4
56 7.6 36.8
57 7.4 34.6
58 7.1 32.5
59 6.9 30.7
60 6.7 29.0
61 6.4 27.4
62 6.2 26.0
63 6.0 24.6
64 5.8 23.4
65 5.6 22.2
Setting the ADJ Pin Voltage
The slope of ∆T/∆t detection is determined by ADJ
pin voltage of the AIC1784.
The calculation of ADJ pin voltage is shown in the
following procedure followed by an example.
Procedure
(a) First, determine the temperature protection limits
TH an d TL. Then, sub stitute TH & TL into the
following equation:
∆V TS
∆TBASE
=
0.72 VCC − 0. 29 VCC
TH − TL
=
0. 43 VCC
TH − TL
(b) Determine the safety timer to obtain the value of
∆tBASE .
∆tBASE(sec.)
=
56(sec.)
80(min .)
× Safety
Timer (min .)
(c) Determine th e expected slope of ∆T / ∆t at
which tem perature rises y °C in x seconds and
fast charge is subsequently cut off.
∆T
∆t
=
y
x
(d) Calculate the value of VADJ
VADJ
=
30
×
∆VTS
∆TBASE
×
∆T
∆t
×
∆tBASE
Example
(a) Let TH=50°C, TL=0°C, VCC =5V. We have
∆VTS
∆TBASE
=
0.43 × 5
50 − 0
=°0.043V/
C
which m eans that V TS d ecreases 43 mV as
temperature rises 1°C.
(b) If safety timer is equal to 80 minute s, ∆tBASE is
then 56 seconds.
(c) If fast charge sho uld be terminate d whe n
temperature rises 1°C in 60 seconds, then
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AIC1784.PDF ] | |
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