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參數(shù)資料
| 型號： | ISL6292-1CR5-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-TSSOP -40 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 5 X 5 MM, PLASTIC, MO-220VHHB, QFN-16 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 550K |
| 代理商： | ISL6292-1CR5-T |
13
FN9105.9
December 17, 2007
End-of-Charge (EOC) Current
The end-of-charge current IMIN sets the level at which the
charger starts to indicate the end of the charge with the
STATUS pin, as shown in Figure 19. The charger actually
does not terminate charging until the end of the TIMEOUT,
set in two ways, by connecting a resistor between the IMIN
pin and ground, or by connecting the IMIN pin to the V2P8
pin. When programming with the resistor, the IMIN is set in
Equation 6.
where RIMIN is the resistor connected between the IMIN pin
and the ground. When connected to the V2P8 pin, the IMIN
is set to 1/10 of IREF, except when the IREF pin is shorted to
GND. Under this exception, IMIN is 5mA. For the ISL6292 in
the 3x3 DFN package, the IMIN pin is bonded internally to
V2P8.
Charge Current Thermal Foldback
Over-heating is always a concern in a linear charger. The
maximum power dissipation usually occurs at the beginning
of a charge cycle when the battery voltage is at its minimum
but the charge current is at its maximum. The charge current
thermal foldback function in the ISL6292 frees users from
the over-heating concern.
Figure 20 shows the current signals at the summing node of
the current error amplifier CA in the Block Diagram shown on
Temperature Monitoring block. The IT has no impact on the
charge current until the internal temperature reaches
approximately +100°C; then IT rises at a rate of 1A/°C.
When IT rises, the current control loop forces the sensed
current ISEN to reduce at the same rate. As a mirrored
current, the charge current is 100,000 times that of the
sensed current and reduces at a rate of 100mA/°C. For a
charger with the constant charge current set at 1A, the
charge current is reduced to zero when the internal
temperature rises to +110°C. The actual charge current
settles between +100°C to +110°C.
Usually the charge current should not drop below IMIN because
of the thermal foldback. For some extreme cases (if that does
happen) the charger does not indicate end-of-charge unless
the battery voltage is already above the recharge threshold.
2.8V Bias Voltage
The ISL6292 provides a 2.8V voltage for biasing the internal
control and logic circuit. This voltage is also available for
external circuits such as the NTC thermistor circuit. The
maximum allowed external load is 2mA.
NTC Thermistor
The ISL6292 uses two comparators (CP2 and CP3) to form a
window comparator, as shown in Figure 22. When the TEMP
pin voltage is “out of the window,” determined by the VTMIN
and VTMAX, the ISL6292 stops charging and indicates a fault
condition. When the temperature returns to the set range, the
charger re-starts a charge cycle. The two MOSFETs, Q1 and
Q2, produce hysteresis for both upper and lower thresholds.
The temperature window is shown in Figure 21.
As the TEMP pin voltage rises from low and exceeds the 1.4V
threshold, the under temperature signal rises and does not
clear until the TEMP pin voltage falls below the 1.2V falling
threshold. Similarly, the over-temperature signal is given when
the TEMP pin voltage falls below the 0.35V threshold and does
I
MIN
10000
V
REF
R
IMIN
----------------
0.8V
R
IMIN
----------------
4
×10 A
()
=
=
(EQ. 6)
FIGURE 20. CURRENT SIGNALS AT THE AMPLIFIER CA INPUT
Temperature
100OC
I
R
I
T
I
SEN
FIGURE 21. CRITICAL VOLTAGE LEVELS FOR TEMP PIN
2.8V
V
TMIN (1.4V)
0V
Under
Temp
Over
Temp
TEMP
Pin
Voltage
V
TMIN- (1.2V)
V
TMAX (0.35V)
V
TMAX+ (0.406V)
FIGURE 22. THE INTERNAL AND EXTERNAL CIRCUIT FOR
THE NTC INTERFACE
+
-
+
-
V2P8
TEMP
GND
2.8V
R2
60K
R3
75K
R4
25K
R5
4K
Q1
Q2
CP2
CP3
Under
Temp
Over
Temp
ISL6292
R
U
To TEMP Pin
V
TMIN
V
TMAX
R
T
+
-
R1
40K
Battery
Removal
CP1
V
RMV
ISL6292
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