Rainbow-electronics DS2778 Uživatelský manuál stáhnout pdf (Strana 6)

DS2775/DS2776/DS2777/DS2778

2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with

Protector and Optional SHA-1 Authentication

6 _______________________________________________________________________________________

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

DISCHARGE-OVERCURRENT

PROTECTION DELAY

DS2775/6/7/8 toc01

DC FET

GATE

2V/div

1V/div

20mV/div

DC FET

SOURCE

SNS

25mΩ

SENSE RESISTOR

WITH DISCHARGE-

OVERCURRENT

THRESHOLD = 38mV

TIME (ms)

161412108642020

CC FET GATE TURN-OFF DURING

CHARGE-OVERCURRENT EVENT

DS2775/6/7/8 toc02

CC FET

GATE

2V/div

1V/div

20mV/div

CC FET

SOURCE

CC FET

SNS

25mΩ

SENSE RESISTOR

WITH CHARGE-

OVERCURRENT

THRESHOLD = 25mV

TIME (μs)

403530252015105050

DC FET GATE TURN-OFF DURING

SHORT-CIRCUIT EVENT

DS2775/6/7/8 toc03

DC FET

GATE

2V/div

1V/div

50mV/div

DC FET

SOURCE

DC FET

SNS

25mΩ

SENSE RESISTOR

WITH SHORT-CIRCUIT

THRESHOLD = 150mV

TIME (μs)

161412108642020

SHORT-CIRCUIT PROTECTION

DELAY

DS2775/6/7/8 toc04

DC FET

GATE

2V/div

1V/div

100mV/div

DC FET

SOURCE

DC FET

SNS

25mΩ

SENSE RESISTOR

WITH SHORT-CIRCUIT

THRESHOLD = 150mV

TIME (μs)

180

160140120100806040200 200

VOLTAGE MEASUREMENT

ACCURACY

DS2775/6/7/8 toc05

INX

(V)

ACCURACY (mV)

4321

+70°C

-20°C

+25°C

CHARGE-PUMP STARTUP EXITING SLEEP

MODE (V

= 8V NO LOAD ON PK+)

DS2775/6/7/8 toc06

TIME (ms)

VOLTAGE (V)

908010 20 30 50 6040 70

-2

0 100

2.75V

12.6V

1 2 3 4 5 6 7 8 9 10 11 ... 44 45

DS2775/DS2776/DS2777/DS2778 1

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