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參數(shù)資料
| 型號： | ISL6292BCRZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | ECONOLINE: REZ - Cost Effective- 1kVDC & 2kVDC Isolation- Custom Solutions Available- No Extern. Components Required- UL94V-0 Package Material- Efficiency to 85% |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | LEAD FREE, 4 X 4 MM, PLASTIC, QFN-16 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 287K |
| 代理商： | ISL6292BCRZ-T |
9
FN9139 .1
April 19, 2005
C
TIME
is the timing capacitor shown in the Typical
Application circuit. A 1nF capacitor leads to 14 minutes of
TIMEOUT. For example, a 15nF capacitor sets the
TIMEOUT to be 3.5 hours. The charger is terminated when
the TIMEOUT is reached.
The trickle mode charge has a time limit of 1/8 TIMEOUT. If
the battery voltage does not reach V
MIN
within that limit, a
TIMEOUT fault is issued and the charger latches up. The
charger stays in trickle mode for at least 15 cycles of the
internal oscillator and, at most, 1/8 of TIMEOUT.
Recharge Threshold
The charger terminates when the TIMEOUT limit expires.
After the termination, if the battery is below the recharge
threshold given in the Electrical Specification table, the
charger starts a re-charge cycle.
LED Indications
RED and GRN are two open-drain outputs that directly drive
a tri-color LED. At the moment when the power is applied or
when the charger is enabled through the EN pin, the charger
starts to charge and the RED indication pin outputs a low
impedance to drive a red LED. Once the charge finishes
(either when the EOC condition is qualified or when the
TIMEOUT completes), the GRN pin turns on to drive a green
LED and the red LED is off. The green LED remains on
unless the input power is recycled, or when the EN pin is
toggled, or a fault case happens. When a recharge occurs,
the indication remains in green.
When a fault case happens, both the RED and the GRN pins
are on to indicate a yellow color.
If the FAULT is a TIMEOUT
fault, the yellow indication is latched and can only be reset
through the EN pin or the input power. If the FAULT is an
ambient temperature FAULT, the charger restarts after the
fault condition is removed. When not powered or when not
enabled, both LEDs are off. Table 1 summarizes the LED
indications.
VSEN Pin
The VSEN pin allows remote sensing of the battery voltage
to minimize the resistive voltage drop between the charger
output and the battery positive terminal. Figure 5 shows the
internal voltage feedback circuit. In applications that the
remote sense pin goes through a connector, a local low-
value resistor is recommended, as the R
1
shown in Figure 5,
in case the connector has bad contact. The sum of R
2
and
R
3
is 75k
, therefore, a 10
R
1
is negligible in output
voltage accuracy.
Ambient Temperature Sensing
The TEMP pin is used to set the ambient temperature range
that allows 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 ISL6292B
provides the DT pin to set a higher temperature threshold
after the charger starts.
Figure 6 shows the internal circuit for the ambient
temperature sensing function. The 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)
FIGURE 5. THE INTERNAL VOLTAGE FEEDBACK CIRCUIT
+
-
BAT
VSEN
R2
Q1
R3
VA
Enable
V
REF
R1
10
TABLE 1. LED INDICATION SUMMARY
STATUS
RED GRN
INDICATION
Charging
L
H
Red
Full Charge (EOC), or recharging
H
L
Green
Trickle TIMEOUT Error
L
L
Yellow (Latched)
Over/Under Ambient Temperature
L
L
Yellow
No Battery
H
H
Off
FIGURE 6. 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
ISL6292B
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