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PDF TSM1015 Data sheet ( Hoja de datos )
| Número de pieza | TSM1015 | |
| Descripción | Low Consumption Voltage and Current Controller | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TSM1015www.DataSheet4U.com
Low Consumption Voltage and Current
Controller for Battery Chargers and Adaptors
PRELIMINARY DATA
s Constant voltage and constant current
control
s Low consumption
s Low voltage operation
s Low external component count
s Current sink output stage
s Easy compensation
s High ac mains voltage rejection
D
SO-8
(Plastic Package)
Voltage Reference:
s Fixed output voltage reference 1.25V
s 0.5% and 1% Voltage precision
Description
TSM1015 is a highly integrated solution for SMPS
applications requiring CV (constant voltage) and
CC (constant current) mode.
TSM1015 integrates one voltage reference and
two operational amplifiers.
The voltage reference combined with one
operational amplifier makes it an ideal voltage
controller. The other operational, combined with
few external resistors and the voltage reference,
can be used as a current limiter.
TSM1015 is pin to pin compatible with TSM103
and represents an enhanced version low
consumption.
S
MiniSO-8
(Plastic Micropackage)
Pin Connections (top view)
1 Cv Out Vcc 8
2 Cv- CC Out 7
3 Vref
Cc- 6
4 Gnd
Cc+ 5
Applications
s Adapters
s Battery chargers
Order Codes
Part Number
TSM1015ID
TSM1015IDT
TSM1015AID
TSM1015AIDT
TSM1015IST
TSM1015AIST
Temperature Range Package
-40 to 105°C
SO-8
mini SO-8
Packaging
Tube
Tape & Reel
Tube
Tape & Reel
Tape & Reel
Tape & Reel
VRef (%)
1
1
0.5
0.5
1
0.5
Marking
M1015
M1015
M1015A
M1015A
M810
M811
November 2004
Revision 1
1/10
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1 page  
Principles of Operation and Application Tips
TSM1015
3 Principles of Operation and Application Tips
3.1 Voltage control
www.DataSheet4U.com
The voltage loop is controlled via a first transconductance operational amplifier, the resistor bridge R1,
R2, and the optocoupler which is directly connected to the output.
The relation between the values of R1 and R2 should be chosen as written in Equation 1.
R1 = R2 x VRef / (Vout - VRef)
Equation 1
Where Vout is the desired output voltage.
To avoid the discharge of the load, the resistor bridge R1, R2 should be highly resistive. For this type of
application, a total value of 100KΩ (or more) would be appropriate for the resistors R1 and R2.
As an example, with R2 = 100KΩ, Vout = 4.10V, Vref = 1.25V, then R1 = 41.9KΩ.
Note that if the low drop diode should be inserted between the load and the voltage regulation resistor
bridge to avoid current flowing from the load through the resistor bridge, this drop should be taken into
account in the above calculations by replacing Vout by (Vout + Vdrop).
3.2 Current control
The current loop is controlled via the second trans-conductance operational amplifier, the sense resistor
Rsense, and the optocoupler.
Vsense threshold is achieved externally by a resistor bridge tied to the Vref voltage reference. Its middle
point is tied to the positive input of the current control operational amplifier, and its foot is to be connected
to lower potential point of the sense resistor as shown on the following figure. The resistors of this bridge
are matched to provide the best precision possible.
The control equation verifies:
Rsense x llim = Vsense
Equation 2
Vsense = R5*Vref/(R4+R5)
llim = R5*Vref/(R4+R5)*Rsense
Equation 2’
where Ilim is the desired limited current, and Vsense is the threshold voltage for the current control loop.
Note that the Rsense resistor should be chosen taking into account the maximum dissipation (Plim)
through it during full load operation.
Plim = Vsense x llim
Equation 3
Therefore, for most adapter and battery charger applications, a quarter-watt, or half-watt resistor to make
the current sensing function is sufficient.
The current sinking outputs of the two trans-connuctance operational amplifiers are common (to the
output of the IC). This makes an ORing function which ensures that whenever the current or the voltage
reaches too high values, the optocoupler is activated.
The relation between the controlled current and the controlled output voltage can be described with a
square characteristic as shown in the following V/I output-power graph.
5/10
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet TSM1015.PDF ] | |
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