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參數(shù)資料
| 型號： | SA58780 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Sense current amplifier with selectable gain |
| 中文描述： | 檢測電流放大器增益的選擇 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 137K |
| 代理商： | SA58780 |
Philips Semiconductors
Product data
SA58780
Sense current amplifier with selectable gain
2003 Nov 10
11
TYPICAL CHARACTERIZATION CURVES
(continued)
V
CC
= 5.0 V; V
GSEL
= V
ISEL
= 5 V; R
L
= 10 k
; T
amb
= 25
°
C; unless otherwise specified.
SL02027
INPUT DIFFERENTIAL VOLTAGE, V
IDF
(mV)
–250
–50
150
250
7
0
50
–150
1
2
4
5
I
I
(
3
6
μ
Figure 33. Input bias current versus input differential voltage.
APPLICATION INFORMATION
Battery current sensing circuit
The circuit shown in Figure 34 will sense when the load is drawing
current from the battery, and the output of Pin 6 to an
analog-to-digital converter can be used to provide a digital readout.
Pin 8, the Gain Select, is tied to ground. This gives a fixed G
v
of
50 V/V. For a fixed G
v
of 100 V/V, tie Pin 8 to V
CC
. For selectable
gain, Pin 8 may be connected to a user-controlled selector switch or
the output of another device that will change state as the current
rises and falls.
2
3
1
5
4
6
7
8
TO CHARGER CIRCUIT
TO ADC
2.5 V
BATTERY
R
S
20 M
SL01573
Figure 34. Battery current sensing circuit.
Charger current sensing
The only difference between the battery and charge current sense
circuits is the diode position.
2
3
1
5
4
6
7
8
TO CHARGER CIRCUIT
TO ADC
2.5 V
BATTERY
R
S
20 M
SL01574
Figure 35. Charger current sensing circuit.
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