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DS2712Z+T Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS2712Z+T Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page DS2711/DS2712: Loose-Cell NiMH Chargers 8 of 15 DS2712 Parallel Charge Configuration with Switch-Mode Charge Current Regulation The example in Figure 5 uses the DS2712 to regulate charge current as a switching (buck) regulator. ICHG is set to 2A using RSNS = 0.056 Ω. The effective charge current for each cell is ICHG x 0.484 = 968mA. The CSOUT comparator output switches OFF when the voltage across the sense resistor goes above 0.125V and back ON when the voltage drops below 0.100V. In this mode, the operating frequency is determined primarily by the value of the inductor, the hysteresis, the input voltage, and the voltage on the cells. In some cases, a damping network may be required to prevent overshoot with the batteries removed. Figure 5. Parallel Configuration with Switch-Mode Current Regulation (DS2712 Only) CC1 CC2 LED1 VSS LED2 CSOUT VN1 VN0 VP1 VP2 THM2 THM1 VDD CTST 0.056 270 1u +5V 680 10K 270 DMSEL TMR 10K 47u 10k 10k 75k 100k 10 47uHy 103AT-2 C1 47uF DS2712 103AT-2 ICHG 0.1 GND RSNS FCX718 FCX718 100 100 150 FCX718 |
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