參數(shù)資料
型號(hào): LTC3554EUD-2#TRPBF
廠(chǎng)商: LINEAR TECHNOLOGY CORP
元件分類(lèi): 穩(wěn)壓器
英文描述: 0.6 A BATTERY CHARGE CONTROLLER, 2590 kHz SWITCHING FREQ-MAX, PQCC20
封裝: 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件頁(yè)數(shù): 10/36頁(yè)
文件大?。?/td> 418K
代理商: LTC3554EUD-2#TRPBF
LTC3554/LTC3554-2
18
35542fb
NTC thermistors have temperature characteristics which
are indicated on resistance-temperature conversion ta-
bles. The Vishay-Dale thermistor NTHS0603N011-N1003F,
used in the following examples, has a nominal value of
100k and follows the Vishay curve 1 resistance-tempera-
ture characteristic.
In the explanation below, the following notation is used.
R25 = Value of the thermistor at 25°C
RNTC|COLD = Value of thermistor at the cold trip point
RNTC|HOT = Value of the thermistor at the hot trip point
rCOLD = Ratio of RNTC|COLD to R25
rHOT = Ratio of RNTC|HOT to R25
RNOM = Primary thermistor bias resistor (see Figure 2)
R1 = Optional temperature range adjustment resistor (see
Figure 2)
The trip points for the LTC3554’s temperature qualica-
tion are internally programmed at 0.35 VBUS for the hot
threshold and 0.76 VBUS for the cold threshold.
OPERATION
Figure 1. Typical NTC Thermistor Circuit
Figure 2. NTC Thermistor Circuit with Additional Bias Resistor
+
+
RNOM
100k
RNTC
100k
NTC
VBUS
NTC_ENABLE
3554 F01
NTC BLOCK
TOO_COLD
TOO_HOT
0.76 VBUS
(NTC RISING)
0.35 VBUS
(NTC FALLING)
0.017 VBUS
(NTC FALLING)
+
20
15
+
+
RNOM
105k
RNTC
100k
R1
12.7k
NTC
VBUS
NTC_ENABLE
3554 F02
TOO_COLD
TOO_HOT
0.76 VBUS
(NTC RISING)
0.35 VBUS
(NTC FALLING)
0.017 VBUS
(NTC FALLING)
+
20
15
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