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PDF TSM105L Data sheet ( Hoja de datos )
| Número de pieza | TSM105L | |
| Descripción | CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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TSM105
CONSTANT VOLTAGE AND CONSTANT CURRENT
CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS
s CONSTANT VOLTAGE AND CONSTANT
CURRENT CONTROL
s LOW VOLTAGE OPERATION
s PRECISION INTERNAL VOLTAGE REFER-
ENCE
s LOW EXTERNAL COMPONENT COUNT
s CURRENT SINK OUTPUT STAGE
s EASY COMPENSATION
s LOW AC MAINS VOLTAGE REJECTION
DESCRIPTION
TSM105 is a highly integrated solution for SMPS
applications requiring CV (constant voltage) and
CC (constant current) mode.
TSM105 integrates one voltage reference, two
operational amplifiers (with ORed outputs - com-
mon collectors), and a current sensing circuit.
The voltage reference combined with one opera-
tional amplifier makes it an ideal voltage control-
ler, and the other low voltage reference combined
with the other operational amplifier makes it an
ideal current limiter for output low side current
sensing.
The current threshold is fixed, and precise.
The only external components are:
* a resistor bridge to be connected on the output of
the power supply (adapter, battery charger) to set
the voltage regulation by dividing the desired out-
put voltage to match the internal voltage reference
value.
* a sense resistor whose value and allowable dis-
sipation power need to be chosen according to the
internal voltage threshold.
* optional compensation components (R and C).
TSM105, housed in one of the smallest package
available, is ideal for space shrinked applications
such as adapters and battery chargers.
APPLICATIONS
s ADAPTERS
s BATTERY CHARGERS
ORDER CODE
Part Temperature
Number
Range
TSM105CLT
TSM105CD
0 to 85°C
0 to 85°C
Package
LD
•
•
Marking
M105
TSM105
L = Tiny Package (SOT23-5) - only available in Tape & Reel (LT)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
L
SOT23-5
(Plastic Package)
D
SO8
(Plastic Micropackage)
PIN CONNECTIONS (top view)
SO8
1 Vctrl
Gnd 8
SOT23-5
1 Vctrl Vcc 5 2 Vcc
Out 7
2 Gnd
3 Nc
Ictrl 6
3 Out
Ictrl 4 4 Nc
Nc 5
September 2001
1/9
1 page  
TSM105
PRINCIPLE OF OPERATION AND APPLICATION HINTS
1. Voltage and Current Control
1.1. Voltage Control
The voltage loop is controlled via a first transcon-
ductance operational amplifier, the resistor bridge
R1, R2, and the optocoupler which is directly con-
nected to the output.
The relation between the values of R1 and R2
should be chosen as writen in Equation 1.
R1 = R2 x Vref / (Vout - Vref)
Eq1
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 = 1.210V, then R1 = 41.9KΩ.
Note that if the low drop diode should be inserted
between the load and the voltage regulation resis-
tor bridge to avoid current flowing from the load
through the resistor bridge, this drop should be
taken into account in the above calculations by re-
placing Vout by (Vout + Vdrop).
1.2. Current Control
The current loop is controlled via the second
trans-conductance operational amplifier, the
sense resistor Rsense, and the optocoupler.
The control equation verifies:
Rsense x Ilim = Vsense
eq2
Rsense = Vsense / Ilim
eq2’
where Ilim is the desired limited current, and
Vsense is the threshold voltage for the current
control loop.
As an example, with Ilim = 1A, Vsense = -200mV,
then Rsense = 200mΩ.
Note that the Rsense resistor should be chosen
taking into account the maximum dissipation
(Plim) through it during full load operation.
Plim = Vsense x Ilim.
eq3
As an example, with Ilim = 1A, and Vsense =
200mV, Plim = 200mW.
Therefore, for most adapter and battery charger
applications, a quarter-watt, or half-watt resistor to
make the current sensing function is sufficient.
Vsense threshold is achieved internally by a re-
sistor bridge tied to the Vref voltage reference. Its
middle point is tied to the positive input of the cur-
rent 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 re-
sistors of this bridge are matched to provide the
best precision possible
The current sinking outputs of the two trans-con-
nuctance operational amplifiers are common (to
the output of the IC). This makes an ORing func-
tion which ensures that whenever the current or
the voltage reaches too high values, the optocou-
pler is activated.
The relation between the controlled current and
the controlled output voltage can be described
with a square characteristic as shown in the fol-
lowing V/I output-power graph.
Figure 3 : Output voltage versus output current
Vout
Voltage regulation
TSM105 Vcc : independent power supply
0 Secondary current regulation
TSM105 Vcc : On power output
Primary current regulation
Iout
2. Compensation
The voltage-control trans-conductance operation-
al amplifier can be fully compensated. Both its out-
put and the negative input are directly accessible
for external compensation components.
5/9
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| PDF Descargar | [ Datasheet TSM105L.PDF ] | |
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