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參數(shù)資料
| 型號： | ISL6297 |
| 廠商： | Intersil Corporation |
| 英文描述： | Li-ion/Li Polymer Battery Charger |
| 中文描述： | Li-ion/Li聚合物電池充電器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 432K |
| 代理商： | ISL6297 |
13
FN9215.0
September 27, 2005
Ambient Temperature Sensing
The TEMP pin sets the allowable ambient temperature
range for charging the battery. Typically, an NTC (negative
temperature coefficient) resistor is mounted on the printed
circuit board (PCB) to monitor the ambient temperature. Due
to the self-heating of the PCB during charging, the ISL6297
provides the DT pin to set a higher temperature threshold
during the charge operation.
Figure 9 shows the internal circuit for the ambient
temperature sensing function. Two comparators form a
window comparator whose high-threshold is V
TMIN
and low-
threshold is V
TMAX
. These two thresholds are given in the
Electrical Specifications. The two MOSFETs (Q1 and Q2)
create a hysteresis for each comparator, respectively. The
DT pin is shorted to GND via the internal Q3 MOSFET when
the charger is not charging, resulting in the equivalent circuit
shown in Figure 10 (A). The on-resistance of Q3 is typically
50
and is negligible compared to the external resistors.
When the charger starts to charge, Q3 is turned off to set a
higher temperature range determined by the external
resistor R
D
.
The equivalent circuit is shown in Figure 10 (B).
The DT pin provides a higher shut down ambient
temperature during the charger operation.
When the TEMP pin voltage is “out of the window,” as
determined by the V
TMIN
and V
TMAX
, the ISL6297 stops
charging and indicates a fault condition. When the
temperature returns to the set range, the charger continues
the charge cycle.
As the temperature falls, the TEMP pin voltage rises. When
it exceeds the 2.0V V
TMIN
threshold, an under temperature
condition exists. This condition does not clear until the TEMP
pin voltage falls back below the threshold minus the
hysteresis voltage (V
TMIN-
). Similarly, an over-temperature
condition exists when the TEMP pin voltage falls below the
0.714V V
TMAX
threshold and does return to normal
temperature operation until the voltage rises above the
threshold plus the hysteresis voltage (V
TMAX+)
. The actual
accuracy of the 2.9V supply voltage is
not important
because all the thresholds and the TEMP pin voltage are
ratios determined by the resistor dividers, as shown in
Figure 9.
FIGURE 9. THE INTERNAL AND EXTERNAL CIRCUIT FOR
THE NTC INTERFACE
+
-
+
-
V2P9
TEMP
DT
2.9V
R1
100K
R2
75K
R3
25K
R4
4K
Q1
Q2
CP1
CP2
Under
Temp
Over
Temp
R
U
To TEMP Pin
V
TMIN
V
TMAX
R
T
Q3
R
D
GND
CHG
FIGURE 10. EQUIVALENT CIRCUITS FOR THE NTC DIVIDER
(A) BEFORE CHARGING STARTS
(B) DURING CHARGING
V2P9
TEMP
DT
R
U
R
T
R
Q3
GND
V2P9
TEMP
R
U
R
T
R
D
GND
(A)
(B)
FIGURE 11. CRITICAL VOLTAGE LEVELS FOR TEMP PIN
2.9V
V
TMIN
(2.0V)
V
TMIN-
(1.83V)
0V
Under
Temp
Over
Temp
TEMP
Pin
Voltage
V
TMAX
(0.714V)
V
TMAX+
(0.788V)
ISL6297
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|---|---|
| ISL6297_07 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Li-ion/Li Polymer Battery Charger |
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