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PDF TSM1013 Data sheet ( Hoja de datos )
| Número de pieza | TSM1013 | |
| Descripción | Constant Voltage and Constant Current Controller | |
| Fabricantes | STMicroelectronics | |
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TSM1013
Constant Voltage and Constant Current
Controller for Battery Chargers and Adaptors
s Constant voltage and constant current
control
s Low voltage operation
s Low external component count
s Current sink output stage
s Easy compensation
VOLTAGE REFERENCE
s Fixed output voltage reference 2.5V
s 0.5% and 1% Voltage precision
DESCRIPTION
TSM1013 is a highly integrated solution for SMPS
applications requiring CV (constant voltage) and
CC (constant current) mode.
TSM1013 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.
APPLICATIONS
s Adapters
s Battery Chargers
ORDER CODE
Part
Number
Temperature Package
Range
SD
Marking
TSM1013I
0 to 105°C
² M1013
TSM1013AI 0 to 105°C
² M1013A
TSM1013I
0 to 105°C
²
M806
TSM1013AI 0 to 105°C
²
M807
Note: S: MiniSO only available in Tape & Reel with T suffix
D: SO is available in Tube (D) and in Tape & Reel (DT)
D
SO-8
S
Mini SO8
PIN CONNECTIONS (top view)
1 Vref
2 Cc-
3 Cc+
4 Cv-
Vcc 8
Cc Out 7
Gnd 6
Cv Out 5
February 2004
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1 page  
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TSM1013
Principle of Operation and Application Hints
3 VOLTAGE AND CURRENT CONTROL
3.1 Voltage Control
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 writen 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 = 2.5V, 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 Ilim = Vsense
Equation 2
Vsense = R5*Vref/(R4+R5)
Ilim = R5*Vref/(R4+R5)*Rsense
Equation 3
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 Ilim.
Equation 4
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.
Fig. 3: Output voltage versus output current
Vout
Voltage regulation
TSM1013 Vcc : independent power supply
Secondary current regulation
0
TSM1013 Vcc : On power output
Primary current regulation
Iout
4 COMPENSATION
5/8
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| PDF Descargar | [ Datasheet TSM1013.PDF ] | |
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