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PDF TSM101 Data sheet ( Hoja de datos )
| Número de pieza | TSM101 | |
| Descripción | VOLTAGE AND CURRENT CONTROLLER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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TSM101/A
VOLTAGE AND CURRENT CONTROLLER
s 1.24V SERIES VOLTAGE REFERENCE
WITH 10mA OUTPUT CURRENT AND 1%
PRECISION (TSM101A)
s TWO OPERATIONAL AMPLIFIERS WITH
ORED OUTPUT AND 1MHZ GAIN BAND-
WIDTH PRODUCT
s BUILT-IN CURRENT GENERATOR WITH
ENABLE/DISABLE FUNCTION
s 4.5 TO 32V SUPPLY VOLTAGE RANGE
s SO8 AND DIP8 PACKAGES
DESCRIPTION
The TSM101/TSM101A integrated circuit incorpo-
rates a high stability series band gap voltage refer-
ence, two ORed operational amplifiers and a c ur-
rent source.
This IC compares the DC v oltage and the current
level at the output of a s witching powe r supply to
an i nternal ref erence. I t prov ides a f eedback
through an opt ocoupler to the P WM controller IC
in the primary side.
The controlled c urrent generator can b e us ed t o
modify the level of current limitation by of fsetting
the i nformation c oming f rom t he c urrent sensing
resistor.
APPLICATIONS
This c ircuit i s designed t o be us ed i n bat tery
chargers with a constant voltage and a limited out-
put current.
It can be used in every types of application requir-
ing a precision voltage regulation and current limi-
tation.
Other appl ications i nclude v oltage supervisors,
over voltage protection...
ORDER CODE
Part Number
TSM101C/AC
TSM101I/AI
Temperature
Range
-20°C, +80°C
-40°C, +105°C
Package
ND
••
••
N = Dual in Line Package (DIP)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
N
DIP8
(Plastic Package)
D
SO8
(Plastic Micropackage)
PIN CONNECTIONS (top view)
1 Vref
2
3
4
8
7
6
5
June 2001
1/13
http://www.Datasheet4U.com
1 page  
APPLICATION NOTE
A BATTERY CHARGER USING THE TSM101
This technical note shows how to use the TSM101
integrated c ircuit w ith a switching mode p ower
supply (SMPS) to realize a battery charger.
An example of realization o f a 1 2V Nickel-cadmi-
um battery charger is given.
1 - TSM101 PRESENTATION
The TSM101 integrated circuit incorporates a high
stability series ba nd g ap v oltage ref erence, t wo
ORed operational amplifiers and a c urrent source
(Figure 1)
Figure 1 : TSM101 Schematic Diagram
1 Vref 8
27
36
45
This IC compares the DC v oltage and the current
level at the output of a s witching power s upply to
an i nternal ref erence.It pro vides a feedback
through an optocoupler to t he PWM c ontroller I C
in the primary side.
The c ontrolled c urrent generator can be us ed t o
modify the l evel of c urrent l imitation by of fsetting
the i nformation coming f rom t he current s ensing
resistor.
A great majority of low or medium end power sup-
plies is voltage regulated by using shunt program-
mable voltage references like the TL431
(Figure 2).
The galvanic insulation of t he c ontrol information
is done b y using an opto-coupler i n l inear mode
with a variable photo current depending on the dif-
ference between the actual output voltage and the
desired one.
A current limitation is us ed to prot ect t he p ower
supply agai nst short c ircuits, but l acks preci sion.
This limitation is generally realized by sensing the
current of the power transistor, in the primary side
of the SMPS.
The role of the TSM101 is to make a fine regula-
tion of the output current of the SMPS and a pre-
cise voltage limitation.
The pri mary c urrent l imitation is c onserved a nd
acts as a s ecurity f or a f ail-safe op eration i f a
short-circuit occurs at the output of the charger.
2 - PRINCIPLE OF OPERATION
The current regulation loop and the voltage limita-
tion loop use an internal 1.24V band-gap voltage
reference. This voltage reference has a good pre-
cision (better than 1.5%) and exhibits a very stable
temperature behavior.
The current limitation is performed by sensing the
voltage a cross the l ow o hmic value re sistor R5
and comparing it to a fixed value set by the bridge
composed by R2 and R3 (Figure 3).
When the voltage on R5 is higher than the voltage
on R3 t he out put of t he c urrent l oop operat ional
amplifier dec reases. T he opt ocoupler c urrent i n-
creases and tends to reduce the output voltage by
the way of the PWM controller.
The v oltage regul ation i s done by c omparing a
part of the out put v oltage (res istor bri dge R6, R7
and P1) to the voltage reference (1.24V).
If this part is higher than 1.24V, the output of the
voltage loop operational amplifier decreases.
5/13
5 Page 
TSM101/A
The current control is given by the choice of the
voltage drop through the sense resistor R5 (to be
linked t o t he nom inal c urrent of t he appl ication)
and by the value of the sense resistor itself.
For medium currents (< 1A ), a good value for the
voltage drop through R5 can be Vsense = 200mV
(dissipation < 200mW).
The res istor bri dge R2/R3 s hould be c hosen f ol-
lowing equation 2 :
• Vsense = R3/(R2+R3)xVref
eq2
The total value of the resistor bridge should be i n
the range o f t he kW i n order t o e nsure a p roper
charge for t he voltage reference (i n t he range of
the mA).
To set the c urrent l imit, t he sense res istor R5
should be chosen following equation 3 :
• Ilim = Vsense/R5
eq3
The internal current generator (Isce) can be used
to offset the current limitation with a lower value.
This current generat or is ac tivated by connecting
pin 2 to ground. It is inhibited if pin 2 is connected
to the positive rail via the pull up resistor R1.
The current offset is given by the choice of the re-
sistor R4.
If Ilim1 is the current limit calculated in the previ-
ous paragraph, and Ilim2 is the current limit that is
to be s et when pi n 2 i s c onnected to ground, R4
should be chosen following equation 4 :
• R4 = (Vsense - Ilim2xR5)/Isce
eq4
where Isce = 1.4mA
C4 and C5 are bypass capacitors used to smooth-
en the regulated outputs.
C2 and C3 are capacitors used for high frequency
compensation.
EXAMPLES OF COMPONENT LISTS
Table 1 s ummerizes a f ew ex amples of c ompo-
nent lists to generate quickly 15V/700mA/200mA,
12V/1A/500mA or 8 .2V/200mA/100mA voltage
and current regulations.
Voltage/
Current
Control
R1
R2
R3
R4
R5
R6
R7
P1
2 straps
C2
C3
C4
C5
Figure 2
15V
700mA
200mA
10kΩ
1.2kΩ
220kΩ
100Ω
1.2Ω x 4
1kΩ
12kΩ
100Ω
0Ω
100nF
100nF
10µF2
100nF
12V
1A
500mA
10kΩ
1.2kΩ
220kΩ
68Ω
0.8Ω x 4
1kΩ
8.2kΩ
100Ω
0Ω
100nF
100nF
2µF4
100nF
8.2V
200mA
100mA
10kΩ
1.2kΩ
220kΩ
68Ω
1Ω x 1
1kΩ
5.6kΩ
100Ω
0Ω
100nF
100nF
.7µF
100nF
11/13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet TSM101.PDF ] | |
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