Rainbow-electronics MAX8730 Manuel d'utilisateur télécharger pdf (Page 11)

MAX8730

Low-Cost Battery Charger

______________________________________________________________________________________ 11

OUTPUT RIPPLE VOLTAGE

vs. BATTERY VOLTAGE

BATTERY VOLTAGE (V)

OUTPUT RIPPLE VOLTAGE (mV

P-P

)

MAX8730 toc10

051015 20

0.03

0.06

0.09

0.12

0.15

0.18

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.)

SWITCHING FREQUENCY

vs. BATTERY VOLTAGE

BATTERY VOLTAGE (V)

SWITCHING FREQUENCY (kHz)

MAX8730 toc11

0369121518

200

400

600

800

1000

BATTERY REMOVAL

MAX8730toc12

13V

12.5V

OUT

= 4.7µF

OUT

= 10µF

4µs/div

CHARGE

CURRENT = 12V

ADAPTER INSERTION

MAX8730toc13

20V

100µs/div

ADAPTER

PDS

PDL

SYSTEM

LOAD

ADAPTER

INSERTION

ADAPTER REMOVAL

MAX8730toc14

20V

4ms/div

ADAPTER

PDS

PDL

SYSTEM

LOAD

BATTERY

VOLTAGE = 16.8V

SYSTEM LOAD TRANSIENT

MAX8730toc15

500mV/div

200µs/div

LOAD

CURRENT

ADAPTER

CURRENT

INDUCTOR

CURRENT

COMPENSATION

CCS

CCI

CCS

CCI

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 28 29

Low-Cost Battery Charger 1

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Rainbow-electronics MAX8730 Manuel d'utilisateur Page 11

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