DS2711 查看數據表（PDF） - Maxim Integrated

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DS2711

Loose-Cell NiMH Chargers

Maxim Integrated 

DS2711/DS2712: Loose-Cell NiMH Chargers

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 = 0.056Ω. 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)

FCX718

10K

C1 47uF

10K

+5V

100

270

270

680

150

47u 1u

FCX718

47uHy

FCX718

0.1

100

DS2712

CC1

VP2

CC2

VP1

LED1

THM2

VSS

THM1

LED2

VDD

CSOUT TMR

VN1

CTST

VN0 DMSEL

10

10k

103AT-2

10k

103AT-2

100k

75k

ICHG

RSNS

0.056

GND

8 of 15

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