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TSM1051L PDF 데이터시트 ( Data , Function )

부품번호 TSM1051L 기능
기능 CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS
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TSM1051L 데이터시트, 핀배열, 회로
TSM1051
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
REFERENCE
s LOW EXTERNAL COMPONENT COUNT
s CURRENT SINK OUTPUT STAGE
s EASY COMPENSATION
s LOW AC MAINS VOLTAGE REJECTION
DESCRIPTION
TSM1051 is a highly integrated solution for SMPS
applications requiring CV (constant voltage) and
CC (constant current) mode.
TSM1051 integrates one voltage reference, two
operational amplifiers (with ORed outputs -
common collectors), and a current sensing circuit.
The voltage reference combined with one
operational amplifier makes it an ideal voltage
controller, 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 to the output of
the power supply (adapter, battery charger) to set
the voltage regulation by dividing the desired
output voltage to match the internal voltage
reference value.
* a sense resistor having a value and allowable
dissipation power which need to be chosen
according to the internal voltage threshold.
* optional compensation components (R and C).
TSM1051, 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 Number
Temperature
Range
TSM1051CLT
TSM1051CD
0 to 85°C
0 to 85°C
Package
LD
Marking
M801
M1051C
L = Tiny Package (SOT23-6) - only available in Tape & Reel (LT)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
L
SOT23-6
(Plastic Package)
D
SO8
(Plastic Micro package)
PIN CONNECTIONS (top view)
SOT23-6
SO8
1 Vctrl Vcc 6 1 Vctrl
Gnd 8
2 Gnd Vsense 5 2 Vcc
Out 7
3 Out Ictrl 4 3 Vsense Ictrl 6
4 Nc
Nc 5
January 2002
1/9




TSM1051L pdf, 반도체, 판매, 대치품
TSM1051
Figure 1 : Internal Schematic
1.210V
Vcc
+ Out
-
200mV
+
-
Gnd
Ictrl Vsense
Figure 2 : Typical Adapter or Battery Charger Application Using TSM1051
TSM1051
1.210V
Vcc
Out
+
-
D OUT+
To primary
R2
Rout
Rvc1
Cvc2470K
22pF
Cvc1
2.2nF
IL
200mV
+ Ictrl
+
-
Gnd
Vsense
Cic1
2.2nF
Ric1
22K
+
R1
Vsense
Ric2
500
OUT-
Rsense IL
In the above application schematic, the TSM1051 is used on the secondary side of a flyback adapter (or
battery charger) to provide an accurate control of voltage and current. The above feedback loop is made
with an optocoupler.
4/9

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TSM1051L 전자부품, 판매, 대치품
TSM1051
connected in parallel with another capacitor
Cvc2=22pF.
The current-control trans-conductance operation-
al amplifier can be fully compensated. Both of its
output and negative input are directly accessible
for external compensation components.
An example of a suitable compensation network is
shown in Fig.2. It consists of a capacitor
Cic1=2.2nF and a resistor Ric1=22Kin series.
When the Vcc voltage reaches 12V it could be in-
teresting to limit the current coming through the
output in the aim to reduce the dissipation of the
device and increase the stability performances of
the whole application.
An example of a suitable Rout value could be
330in series with the opto-coupler in case
Vcc=12V.
3. Start Up and Short Circuit Conditions
Under start-up or short-circuit conditions the
TSM1051 is not provided with a high enough sup-
ply voltage. This is due to the fact that the chip has
Figure 10 :
its power supply line in common with the power
supply line of the system.
Therefore, the current limitation can only be en-
sured by the primary PWM module, which should
be chosen accordingly.
If the primary current limitation is considered not to
be precise enough for the application, then a suffi-
cient supply for the TSM1051 has to be ensured
under any condition. It would then be necessary
to add some circuitry to supply the chip with a sep-
arate power line. This can be achieved in numer-
ous ways, including an additional winding on the
transformer.
The following schematic shows how to realize a
low-cost power supply for the TSM1051 (with no
additional windings).
Please pay attention to the fact that in the particu-
lar case presented here, this low-cost power sup-
ply can reach voltages as high as twice the volt-
age of the regulated line. Since the Absolute Max-
imum Rating of the TSM1051 supply voltage is 14
V, this low-cost auxiliary power supply can only be
used in applications where the regulated line volt-
age does not exceed 7 V.
Vcc
Rs 1.210V
DS
200mV
CS + +
Ictrl
TSM105
Vcc
Out
+
-
Rout
D
To primary
OUT+
R2
IL
Rvc1
470K
Cvc2
22pF
Cvc1
2.2nF
+
-
Gnd
Vsense
Cic1
2.2nF
Ric1
22K
+
R1
Vsense
Ric2
500
Rsense IL
OUT-
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