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AN1593 Datasheet(PDF) 4 Page - Motorola, Inc |
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AN1593 Datasheet(HTML) 4 Page - Motorola, Inc |
4 / 8 page 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 W L1 400 mH D1 1N5819 C2 330 mF/16 V ON/OFF Control (from Controller) + + +Vin ON/OFF R3 27 W R2 39 W R1 10 k W C3 33 nF RS 0.22 W 3 Battery Cells Under Charge Charge Current Control (from Controller) –VO +VO + – U1 LM2575–ADJ U2 MC33341 Gnd C1 100 mF/50 V Feedback Output 1 2 4 5 3 D2 1 24 5 3 6 7 8 S1 1 2 A R5 560 W R6 100 W 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 IO, OUTPUT CURRENT (A) 0.4 0 0.2 0.6 0.8 1.0 0 1 2 3 4 5 6 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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