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參數(shù)資料
| 型號(hào)： | ISL6297CR |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset 14-TSSOP -40 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 4 X 4 MM, PLASTIC, MO-220VGGC, QFN-16 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 432K |
| 代理商： | ISL6297CR |
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10
FN9215.0
September 27, 2005
Charge Current and R
IREF
Selection
When the ISL6297 is used as a traditional linear charger, the
R
IREF
sets the constant charge current. When working with
a dual-mode, current-limited supply, the CC current is
determined by the supply limited current I
LIM
. I
REF
needs to
be programmed higher than I
LIM
and is used as an
overcurrent protection. Taking into account the tolerance of
both the I
LIM
and I
REF
, it is recommended the I
REF
be
programmed at least 30% higher than the I
LIM
. I
REF
can be
calculated by using the following equation:
(EQ. 3)
The trickle charge current is 10% of I
REF
, that is,
(EQ. 4)
The ISL6297 has a comparator with a 50mV offset voltage to
ensure the input voltage is higher than the battery voltage
before charging starts (see the Block Diagram). This
condition, coupled with an R
DS(on)
of about 400m
(max)
requires I
LIM
be higher than 125mA. The upper limit for I
LIM
is 1.5A.
EOC Current and R
IMIN
Selection
The EOC current level is programmed by the I
MIN
pin and
can be calculated by the following equation:
(EQ. 5)
The EOC current has a programming range up to 400mA.
To qualify as an EOC condition, the battery voltage must be
above the recharge threshold given in the Electrical
FIGURE 4. EVENT SEQUENCE AT POWER UP
DT
V2P9
VIN
RED
GRN
LEDs
Red
Green
off
Yellow
off
500ms
500ms
500ms
Red
I
CHG
384 cycles
max.
Check if
BAT > 1V
If not: FAULT
Charge Starts
Trickle current
EN
500ms
Connection Verification
Short Circuit Test
VSEN
Battery (+)
connection
verified
70ms
500ms
4.4V
FIGURE 5. OPEN BATTERY DETECTED
I
CHG
EN
VSEN
4.4V
70ms
Trickle current
V
IN
500ms
Charge terminates. EN or
POR required before charge
sequence starts again
4.3V
Battery connected here, but voltage
remains above the battery detect
(falling) threshold
- Open battery detected
I
REF
IREF
-----------------
10
5
×
A
( )
=
I
Trickle
IREF
-----------------
10
4
×
A
( )
=
I
MIN
IMIN
----------------
10
4
×
A
( )
=
ISL6297
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| ISL6297CRZ | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset 14-TSSOP -40 to 85 |
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