TSM1051
CONSTANT VOLTAGE AND CONSTANT CURRENT
CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS
s
CONSTANT VOLTAGE AND CONSTANT
s
s
s
s
s
s
CURRENT CONTROL
LOW VOLTAGE OPERATION
PRECISION INTERNAL VOLTAGE
REFERENCE
LOW EXTERNAL COMPONENT COUNT
CURRENT SINK OUTPUT STAGE
EASY COMPENSATION
LOW AC MAINS VOLTAGE REJECTION
ORDER CODE
Part Number
TSM1051CLT
TSM1051CD
Temperature
Range
0 to 85°C
0 to 85°C
Package
Marking
L
•
•
D
M801
M1051C
L = Tiny Package (SOT23-6) - only available in Tape & Reel (LT)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
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
L
SOT23-6
(Plastic Package)
D
SO8
(Plastic Micro package)
PIN CONNECTIONS
(top view)
SOT23-6
1
2
3
Vctrl
Gnd
Out
Vcc
Vsense
Ictrl
6
5
4
1
2
3
4
Vctrl
Vcc
SO8
Gnd
Out
Ictrl
Nc
8
7
6
5
Vsense
Nc
s
ADAPTERS
s
BATTERY CHARGERS
January 2002
1/9
TSM1051
PIN DESCRIPTION
SOT23-6 Pinout
Name
Vcc
Gnd
Vctrl
Ictrl
Out
Vsense
Pin #
6
2
1
4
3
5
Type
Power Supply
Power Supply
Analog Input
Analog Input
Current Sink Output
Analog Input
Function
Positive Power Supply Line
Ground Line. 0V Reference For All Voltages
Input Pin of the Voltage Control Loop
Input Pin of the Current Control Loop
Output Pin. Sinking Current Only
Input Pin of the Current Control Loop
SO8 Pinout
Name
Vcc
Gnd
Vctrl
Ictrl
Out
Vsense
NC
NC
Pin #
2
8
1
6
7
3
5
4
Type
Power Supply
Power Supply
Analog Input
Analog Input
Current Sink Output
Analog Input
Function
Positive Power Supply Line
Ground Line. 0V Reference For All Voltages
Input Pin of the Voltage Control Loop
Input Pin of the Current Control Loop
Output Pin. Sinking Current Only
Input Pin of the Current Control Loop
ABSOLUTE MAXIMUM RATINGS
Symbol
Vcc
Vi
Top
Tj
Rthja
Rthja
DC Supply Voltage
DC Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Maximum Junction Temperature
Thermal Resistance Junction to Ambient SO8 package
Thermal Resistance Junction to Ambient SOT23-6 package
Value
14
-0.3 to Vcc
0 to 85
150
130
250
Unit
V
V
°C
°C
°C/W
°C/W
2/9
TSM1051
OPERATING CONDITIONS
Symbol
Vcc
DC Supply Conditions
Parameter
Value
2.5 to 12
Unit
V
ELECTRICAL CHARACTERISTICS
Tamb = 25°C and Vcc = +5V (unless otherwise specified)
Symbol
Parameter
Test Condition
Min
Typ
Max
Unit
Total Current Consumption
Icc
Total Supply Current - not taking the
output sinking current into account
Tamb
0 < Tamb < 85°C
1.1
1.2
2
mA
Voltage Control Loop
Gmv
Vref
Iibv
Transconduction Gain (Vctrl). Sink
Current Only
1)
Voltage Control Loop Reference
2)
Input Bias Current (Vctrl)
Tamb
0 < Tamb < 85°C
Tamb
0 < Tamb < 85°C
Tamb
0 < Tamb < 85°C
1
1.198
1.186
3.5
2.5
1.21
50
100
1.222
1.234
mA/mV
V
nA
Current Control Loop
Gmi
Vsense
Iibi
Transconduction Gain (Ictrl). Sink
Current Only
3)
Current Control Loop Reference
4)
Current out of pin ICTRL at -200mV
Tamb
0 < Tamb < 85°C
Iout = 2.5mA Tamb
0 < Tamb < 85°C
Tamb
0 < Tamb < 85°C
1.5
196
192
7
200
25
50
204
208
mA/mV
mV
µA
Output Stage
Vol
Ios
Low output voltage at 10 mA sinking
current
Output Short Circuit Current. Output to
Vcc. Sink Current Only
Tamb
0 < Tamb < 85°C
Tamb
0 < Tamb < 85°C
200
27
35
50
mA
mV
1. If the voltage on VCTRL (the negative input of the amplifier) is higher than the positive amplifier input (Vref=1.210V), and it is increased
by 1mV, the sinking current at the output OUT will be increased by 3.5mA.
2. The internal Voltage Reference is set at 1.210V (bandgap reference). The voltage control loop precision takes into account the cumulative
effects of the internal voltage reference deviation as well as the input offset voltage of the trans-conductance operational amplifier. The
internal Voltage Reference is fixed by bandgap, and trimmed to 0.5% accuracy at room temperature.
3. When the positive input at ICTRL is lower than -200mV, and the voltage is decreased by 1mV, the sinking current at the output OUT will
be increased by 7mA.
4. The internal current sense threshold is set to -200mV. The current control loop precision takes into account the cumulative effects of the
internal voltage reference deviation as well as the input offset voltage of the trans-conduction operational amplifier.
3/9
TSM1051
Figure 1 : Internal Schematic
Vcc
1.210V
+
-
+
-
Out
200mV
Gnd
Ictrl
Vsense
Figure 2 : Typical Adapter or Battery Charger Application Using TSM1051
D
OUT+
R2
TSM1051
Vcc
1.210V
Out
Rout
To primary
+
-
Cvc2
22pF
Rvc1
470K
Cvc1
IL
2.2nF
200mV
+
-
Gnd
Cic1
2.2nF
Ric1
22K
+
R1
+
Ictrl
Vsense
Ric2
500
Vsense
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
Load
OUT-
TSM1051
Figure 3 : Vref vs Ambient Temperature
1,230
1,225
2,5V
≤
Vcc
≤
12V
Vsense (V)
Figure 6 : Vsense vs Ambient Temperature
203,5
203,0
202,5
Vcc=2,5V
202,0
201,5
201,0
200,5
Vcc=12V
Vcc=5V
1,220
Vref (V)
1,215
1,210
1,205
1,200
0
20
40
60
80
100
Ta ambient temperature (°C)
120
0
20
40
60
80
100
120
Ta ambient temperature (°C)
Figure 4 : Vsense pin input bias current vs
Ambient Temperature
120
100
80
Iibv (nA)
60
V cc=5V
40
20
0
0
20
40
60
80
100
120
Ta ambient temperature (°C )
V cc=2,5V
V cc=12V
Figure 7 : Ictrl pin input bias current vs
Ambient Temperature
30
28
26
Iibi ( A)
24
Vcc=12V
22
20
18
0
20
40
60
80
100
Ta ambient temperature (°C)
120
Victrl=200mV
Vcc=5V
Vcc=2,5V
Figure 5 : Output short circuit current vs
Ambient Temperature
60
50
40
Ios (mA)
30
20
10
0
0
20
40
60
80
100
Ta ambient temperature (°C)
120
Vcc=12V
Vcc=5V
Figure 8 : Supply current vs Ambient
Temperature
1,6
Vcc=12V
1,4
1,2
Icc (mA)
1,0
0,8
0,6
Vcc=2,5V
Vcc=5V
Vcc=2,5V
0,4
0,2
0,0
0
20
40
60
80
100
Ta ambient temperature (°C)
120
5/9
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