Rainbow-electronics MAX8730 Manual do Utilizador descarregar pdf (Página 12)

MAX8730

Low-Cost Battery Charger

12 ______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 1, adapter = 19.5V, V

BATT

= 12V, V

ICTL

= 2.4V, MODE > 1.8V, REFON = INPON = LDO, V

RELTH

= V

REF

/2, T

+25°C, unless otherwise noted.)

CHARGE CURRENT vs. TIME

TIME (h)

CHARGE CURRENT (A)

MAX8730 toc20

0 0.5 1.0 1.5 2.0 2.5 3.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

INITIAL CONDITION: 4 CELLS

10V BATTERY

FULL CHARGE = 16.8V

LDO LOAD REGULATION

LDO

(mA)

LDO ERROR (%)

MAX8730 toc21

01020304050

-0.9

-0.8

-0.6

-0.4

-0.2

-0.7

-0.5

-0.3

-0.1

CHARGER DISABLED

BATTERY LEAKAGE CURRENT

vs. BATTERY VOLTAGE

BATTERY VOLTAGE (V)

BATTERY-LEAKAGE CURRENT (µA)

MAX8730 toc19

0369121518

100

200

300

400

500

REFON = INPON = 1

REFON = 0

INPON = 1

REFON = 1

INPON = 0

REFON = INPON = 0

ADAPTER QUIESCENT CURRENT

vs. ADAPTER VOLTAGE

ADAPTER VOLTAGE (V)

ADAPTER QUIESCENT CURRENT (mA)

MAX8730 toc18

051015 20 25

0.5

1.0

1.5

2.0

2.5

3.0

BATTERY ABSENT

REFON = 1

INPON = 1

REFON = 0

INPON = 0

PEAK-TO-PEAK INDUCTOR CURRENT

vs. BATTERY VOLTAGE

BATTERY VOLTAGE (V)

PEAK-TO-PEAK INDUCTOR CURRENT (A)

MAX7830 toc16

0369121518

0.5

0.9

0.7

1.1

1.5

1.3

1.7

1.9

2.1

2.3

2.5

EFFICIENCY vs. CHARGE CURRENT

CHARGE CURRENT (A)

EFFICIENCY (%)

MAX8730 toc17

0 1.0 2.0 3.0 3.50.5 1.5 2.5 4.0

100

4 CELLS

3 CELLS

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 28 29

Low-Cost Battery Charger 1

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