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TSM102 Fiches technique(PDF) 6 Page - STMicroelectronics

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

TSM102 Fiches technique(HTML) 6 Page - STMicroelectronics

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APPLICATION NOTE
by R. LIOU
A Li-Ion BATTERY CHARGER USING TSM102A
This application note explains how to use the
TSM102 in an SMPS-type battery charger which
features :
.
Voltage Control
.
Current Control
.
Low Battery Detection and End Of Charge
Detection
1 - TSM102 PRESENTATION
The TSM102 integrated circuit includes two Opera-
tional Amplifiers, two Comparators and one adjust-
able precision Voltage Reference (2.5V to 36V,
0.4% or 1%).
TSM102 can sustain up to 36V power supply volt-
age.
1
2
3
14
15
16
5
6
7
12
11
10
V
CC
+
Vref
Ca tho de
V
CC
-
COMP
COMP
TS M102
Figure 1 : TSM102 Pinout
2 - APPLICATION CONTEXT AND PRINCIPLE
OF OPERATION
In the battery charging field which requires ever
increasing performances in more and more re-
duced space, the TSM102A provides an attractive
solution in terms of PCB area saving, precision and
versatility.
Figure 2 shows the secondary side of a battery
charger (SMPS type) where TSM102A is used in
optimised conditions : the two Operational Amplifi-
ers perform current and voltage control, the two
Comparators provide ”End of Charge” and ”Low
Battery” signals and the Voltage Reference en-
sures precise reference for all measurements.
The TSM102A is supplied by an auxiliary power
supply (forward configuration - D7) regulated by a
bipolar transistor and a zener diode on its base (Q2
and DZ), and smoothed by the capacitors C3 and
C4. R15 polarizes the base of the transistor and at
the same time limits the current through the zener
diode during regulation mode of the auxiliary power
supply.
The current and voltage regulations are made
thanks to the two Operational Amplifiers.
The first amplifier senses the current flow through
the sense resistor Rs and compares it with a part
of the reference voltage (resistor bridge R7, R8,
R9). The second amplifier compares the reference
voltage with a part of the charger’s output (resistor
bridge R1, R2, R3).
When either of these two operational amplifiers
tends to lower its ouput, this linear information is
propagated towards the primary side via two ORing
diodes (D1, D2) and an optocoupler (D3). The
compensation loops of these regulation functions
are ensured by the capacitors C1 and C2.
TSM102
6/10


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