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参数资料
| 型号： | AN1593 |
| 厂商： | Motorola, Inc. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | LOW COST 1.0 A CURRENT SOURCE FOR BATTERY CHARGERS |
| 中文描述： | 低成本1.0电流源的电池充电器 |
| 文件页数： | 4/8页 |
| 文件大小： | 212K |
| 代理商： | AN1593 |
4
MOTOROLA ANALOG IC APPLICATIONS INFORMATION
Figure 3. Low Cost Switching Regulator Performs Constant–Current/Constant–Voltage 3 Cell Charging Function.
Version with Full Short–Circuit Regulation Control Capability.
R4
1.0 k
L1
400 H
D1
1N5819
C2
330 F/16 V
ON/OFF
Control
(from Controller)
+
+
+Vin
ON/OFF
R3
27
R2
39
R1
10 k
C3
33 nF
RS
0.22
3 Battery Cells
Under Charge
Charge Current
Control
(from Controller)
–VO
+VO
+
–
U1
LM2575–ADJ
U2
MC33341
Gnd
C1
100 F/50 V
Feedback
Output
1
2
4
5
3
D2
1
2
4
5
3
6
7
8
S1
1
2
A
R5
560
R6
100
D3
1N4001
1N4745A
Threshold Voltage
Control
(from Controller)
S2
1
2
C4
680 nF
Unregulated
DC – Input
Vin = 10 to 40 V
+
Gnd
Figure 4. Constant–Voltage/Constant–Current Charging Characteristic
of the Improved Current Source for Battery Chargers
6
IO, OUTPUT CURRENT (A)
0.4
0
0.2
0.6
0.8
1.0
0
1
2
3
4
5
V
O
Figure 4 shows the V/I charging characteristic of the
improved circuit (see schematic in Figure 3). The small
voltage drop in the beginning of the V/I characteristic is
caused by dynamic resistance of the diode D2. This
phenomenon can be eliminated either by reconnection of the
resistor R2 from the point “A” to the cathode of the diode D2,
or this diode might be replaced by shorting wire. Both actions
would cause also another effect on the V/I characteristic of
this circuit. When the output voltage drops below
approximately 1.2 V, the output current will fall down
accordingly, thus creating a typical “foldback” V/I
characteristic.
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