參數(shù)資料
型號： TSM102IN
廠商： 意法半導(dǎo)體
英文描述： DUAL OPERATIONAL AMPLIFIER - DUAL COMPARATOR AND ADJUSTABLE VOLTAGE REFERENCE
中文描述： 雙路運算放大器-雙通道比較器和可調(diào)電壓基準(zhǔn)
文件頁數(shù)： 7/10頁
文件大?。?/td> 74K
代理商： TSM102IN
Figure2 :
The ApplicationSchematic - BatteryCharger SecondarySide
The first comparator ensures the ”Low Battery”
signal generation thanks to the comparison of a
part ofthe charger’soutputvoltage (resistorbridge
R17, R19) and the referencevoltage. Proper hys-
teresis is given thanksto R20. An improvement to
the chargers security and to the battery’slife time
optimization is achieved by lowering the current
control measurement thanksto Q1 that shunts the
resistor R9 when the battery’svoltageis belowthe
”Low Battery” level.
The second comparator ensures the ”End of
Charge” signal generation thanks to the compari-
son of a partof the charger’s outputvoltage(resis-
tor bridge R1, R2, R3) and the referencevoltage.
When either of these two signals is active, the
corresponding LED is polarized for convenient
visualizationof thebattery status.
3 - CALCULATION OF THEELEMENTS
two-Lithium-Ionbatteries chargeapplication :
.
CurrentControl : 720mA(Low Battery current
control : 250mA)
.
VoltageControl : 8.4V (= 2x 4.2V)
.
LowBattery : 5.6V(= 2x 2.5V + 0.6V)
.
End of Charge : 8.3V (= 2x 4.15V)
Current Control :
The voltagereferenceis polarized thanksto theR4
resistor (2.5mA), andthe cathodeof the reference
gives a fixed2.500V voltage.
I = U / R = [ Vref ( R8 + R9 ) / (R7 + R8 + R9) ] / Rs
= [ 2.5 x (390 + 820) / (10000 + 390 + 820) ] / 0.375
= 720mA
I = 720mA
P
= power dissipation through the senseresistor = R I2
= 0.375 x 0.7202 =
194mW
In case of ”Low Battery” conditions, the current
control is lowered thanks to the following
equation:
I = U / R = = [ Vref R8 / (R7 + R8) ] / Rs
= [ 2.5 x 390 / (10000 + 390 ) ] / 0.375
= 250mA
I (LoBatt) = 250mA
Voltage Control :
Vout
= Vref / [ R2 / (R1 + R2 + R3) ]
TSM102
7/10
相關(guān)PDF資料
PDF描述
TSM102AID DUAL OPERATIONAL AMPLIFIER - DUAL COMPARATOR AND ADJUSTABLE VOLTAGE REFERENCE
TSM102AIN DUAL OPERATIONAL AMPLIFIER - DUAL COMPARATOR AND ADJUSTABLE VOLTAGE REFERENCE
TSM102I DUAL OPERATIONAL AMPLIFIER - DUAL COMPARATOR AND ADJUSTABLE VOLTAGE REFERENCE
TSM103WAID Circular Connector; No. of Contacts:8; Series:; Body Material:Aluminum; Connecting Termination:Solder; Connector Shell Size:16; Circular Contact Gender:Pin; Circular Shell Style:Cable Receptacle; Insert Arrangement:16-8
TSM103WAIDT Circular Connector; No. of Contacts:8; Series:; Body Material:Aluminum; Connecting Termination:Solder; Connector Shell Size:16; Circular Contact Gender:Pin; Circular Shell Style:Cable Receptacle; Insert Arrangement:16-8
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TSM103 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL OPERATIONAL AMPLIFIER AND VOLTAGE REFERENCE
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