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TSM102 Fiches technique(PDF) 7 Page - STMicroelectronics

No de pièce TSM102
Description  DUAL OPERATIONAL AMPLIFIER - DUAL COMPARATOR AND ADJUSTABLE VOLTAGE REFERENCE
Download  10 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TSM102 Fiches technique(HTML) 7 Page - STMicroelectronics

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Figure 2 : The Application Schematic - Battery Charger Secondary Side
The first comparator ensures the ”Low Battery”
signal generation thanks to the comparison of a
part of the charger’s output voltage (resistor bridge
R17, R19) and the reference voltage. Proper hys-
teresis is given thanks to R20. An improvement to
the chargers security and to the battery’s life time
optimization is achieved by lowering the current
control measurement thanks to Q1 that shunts the
resistor R9 when the battery’s voltage is below the
”Low Battery” level.
The second comparator ensures the ”End of
Charge” signal generation thanks to the compari-
son of a part of the charger’s output voltage (resis-
tor bridge R1, R2, R3) and the reference voltage.
When either of these two signals is active, the
corresponding LED is polarized for convenient
visualization of the battery status.
3 - CALCULATION OF THE ELEMENTS
All the components values have been chosen for a
two-Lithium-Ion batteries charge application :
.
Current Control : 720mA (Low Battery current
control : 250mA)
.
Voltage Control : 8.4V (= 2x 4.2V)
.
Low Battery : 5.6V (= 2x 2.5V + 0.6V)
.
End of Charge : 8.3V (= 2x 4.15V)
Current Control :
The voltage reference is polarized thanks to the R4
resistor (2.5mA), and the cathode of the reference
gives a fixed 2.500V 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 sense resistor = 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


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