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参数资料
| 型号： | LTC3559EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC USB CHARGER 16-QFN |
| 标准包装： | 121 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC3559/LTC3559-1
APPLICATIONS INFORMATION
Alternate NTC Thermistors and Biasing
The battery charger provides temperature quali?ed
charging if a grounded thermistor and a bias resistor are
connected to the NTC pin. By using a bias resistor whose
value is equal to the room temperature resistance of the
thermistor (R25) the upper and lower temperatures are
pre-programmed to approximately 40°C and 0°C, respec-
tively (assuming a Vishay “Curve 1” thermistor).
The upper and lower temperature thresholds can be ad-
justed by either a modi?cation of the bias resistor value
or by adding a second adjustment resistor to the circuit.
If only the bias resistor is adjusted, then either the upper
or the lower threshold can be modi?ed but not both. The
other trip point will be determined by the characteristics
of the thermistor. Using the bias resistor in addition to an
adjustment resistor, both the upper and the lower tempera-
In the explanation below, the following notation is used.
R25 = Value of the thermistor at 25°C
R NTC|COLD = Value of thermistor at the cold trip point
R NTC|HOT = Value of the thermistor at the hot trip point
r COLD = Ratio of R NTC|COLD to R25
r HOT = Ratio of R NTC|HOT to R25
R NOM = Primary thermistor bias resistor (see Figure 3)
R1 = Optional temperature range adjustment resistor (see
Figure 4)
The trip points for the battery charger’s temperature quali-
?cation are internally programmed at 0.349 ? V CC for the
hot threshold and 0.765 ? V CC for the cold threshold.
Therefore, the hot trip point is set when:
ture trip points can be independently programmed with
the constraint that the difference between the upper and
lower temperature thresholds cannot decrease. Examples
of each technique are given below.
|
R NTCHOT
|
R NOM + R NTCHOT
? V CC = 0 . 349 ? V CC
= 0 . 765 ? V
+ R
NTC thermistors have temperature characteristics which
are indicated on resistance-temperature conversion tables.
The Vishay-Dale thermistor NTHS0603N011-N1003F, used
in the following examples, has a nominal value of 100k
and follows the Vishay “Curve 1” resistance-temperature
characteristic.
and the cold trip point is set when:
R NTC | COLD
? V CC CC
R NOM NTC | COLD
R NOM
100k
16
V CC
NTC BLOCK
0.765 ? V CC
(NTC RISING)
R NOM
105k
16
V CC
0.765 ? V CC
(NTC RISING)
TOO_COLD
TOO_COLD
13
R NTC
100k
NTC
R1
12.7k
13
NTC
R NTC
0.349 ? V CC
(NTC FALLING)
TOO_HOT
100k
0.349 ? V CC
(NTC FALLING)
TOO_HOT
+
NTC_ENABLE
+
NTC_ENABLE
0.017 ? V CC
(NTC FALLING)
–
0.017 ? V CC
(NTC FALLING)
–
Figure 3. Typical NTC Thermistor Circuit
3559 F03
3559 F04
Figure 4. NTC Thermistor Circuit with Additional Bias Resistor
3559fb
15
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相关代理商/技术参数 |
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