SGS Thomson Microelectronics TSM1011IST, TSM1011IDT, TSM1011ID, TSM1011AIST, TSM1011AID Datasheet

Revision B 1/9

■ Constant voltage and constant current

control

■ Low voltage operation

■ Low external component count

■ Current sink output s tage

■ Easy compensation

■ 2KV ESD protection

■ VOLTAGE REFERENCE:

l

Fixed output voltage reference

2.545V

l

0.5% and 1% voltage precision

DESCRIPTION

The TSM1011 is a highly integrated solution for
SMPS applications requiring CV (constant
voltage) and CC (constant current) modes.

The TSM1011 integrates one voltage reference
and two operational amplifiers (with ORed outputs

—common collectors).
The voltage reference combined with one

operational amplifier makes it an ideal voltage
controller. The other operational amplifier,
combined with few external resistors and the
voltage reference, can be used as a current
limiter.

APPLICATIONS

■ Adapters

■ Battery chargers

ORDER CODE

D = Small Outline Package (SO) - also available in Tape & Reel (DT
ST = Small Outline Package (MiniSO8) only available in Tape & Reel

PIN CONNECTIONS (top view)

Part Number

Temperature

Range

Package

Marking

SD

TSM1011ID 0 to 105°C • M1011
TSM1011AID 0 to 105°C • M1011A
TSM1011IS 0 to 105°C • M802
TSM1011AIS 0 to 105°C • M803

1
2
3
45

6

Cc-

Gnd

VccVref
Out 7

8

Cc+

Cv+Cv-

D

SO-8

(Plastic Package)

D

MiniSO-8

(Plastic Micropackage)

TSM1011

Constant Voltage and Constant Current Controller

for Battery Chargers and Adapters

September 2003

TSM1011 PIN DESCRIPTIONS

2/9

1 PIN DESCRIPTIONS
SO8 & MiniSO8 Pinout

2 ABSOLUTE MAXIMUM RATINGS

3 OPERATING CONDITIONS

Name Pin # Type Function

Vref 1 Analog Output Voltage Reference

Cc- 2 Analog Input Input pin of the operational amplifier

Cc+ 3 Analog Input Input pin of the operational amplifier

Cv- 4 Analog Input Input pin of the operational amplifier
Cv+ 5 Analog Input Input pin of the operational amplifier
Gnd 6 Power Supply Ground Line. 0V Reference For All Voltages

Out 7 Analog Output Output of the two operational amplifier

Vcc 8 Power Supply Power supply line.

Symbol DC Supply Voltage Value Unit

Vcc DC Supply Voltage (50mA =< Icc) -0.3V to Vz V

Vi Input Voltage -0.3 to Vcc V

PT Power dissipation W

Toper Operational temperature 0 to 105 °C

Tstg Storage temperature -55 to 150 °C

Tj Junction temperature 150 °C

Iref Voltage reference output current 10 mA

ESD Electrostatic Discharge 2 KV
Rthja Thermal Resistance Junction to Ambient Mini SO8 package 180 °C/W
Rthja Thermal Resistance Junction to Ambient SO8 package

175

°C/W

Symbol Parameter Value Unit

Vcc DC Supply Conditions 4.5 to Vz V

ELECTRICAL CHARACTERISTICS TSM1011

3/9

4 ELECTRICAL CHARACTERISTICS

T

amb

= 25°C and Vcc = +18V (unless otherwise specified)

Symbol Parameter Test Condition Min Typ Max Unit

Total Current Consumption

Icc Total Supply Current, excluding current

in Voltage Reference.

Vcc = 18V, no load
Tmin. < Tamb < Tmax.

1mA

Vz Vcc clamp voltage Icc = 50mA 28 V

Operators

V

io

Input Offset Voltage
TSM1011

TSM1011A

T

amb

= 25°C

T

min.

≤ T

amb

≤ T

max.

T

amb

= 25°C

T

min.

≤ T

amb

≤ T

max.

1

0.5

4
5
2
3

mV

DV

io

Input Offset Voltage Drift 7

µ

V/°C

I

io

Input Offset Current T

amb

= 25°C

T

min.

≤ T

amb

≤ T

max.

23050nA

I

ib

Input Bias Current T

amb

= 25°C

T

min.

≤ T

amb

≤ T

max.

20
50

150
200

nA

SVR Supply Voltage Rejection Ratio V

CC

= 4.5V to 28V 65 100 dB
Vicm Input Common Mode Voltage Range for CV op-amp 1.5 Vcc-1.5 V
Vicm Input Common Mode Voltage Range for CC op-amp 0 Vcc-1.5 V
CMR Common Mode Rejection Ratio T

amb

= 25°C

T

min.

≤ T

amb

≤ T

max.

70
60

85 dB

Output stage

Gm Transconduction Gain. Sink Current

Only

1

1) The cur rent depend s on the difference voltage bewee n the negati ve and the positive input s of the amp l i fier. If the voltage on the minus
input is 1mV higher than the positive amplifier, the sinking current at the output OUT will be increased by 3.5mA.

T

amb

= 25°C

T

min.

≤ T

amb

≤ T

max.

1 3.5

2.5

mA/mV

Vol Low level output voltage at 10 mA

sinking current

200 600 mV

Ios Output Short Circuit Current. Output to

Vcc. Sink Current Only

T

amb

= 25°C

T

min.

≤ T

amb

≤ T

max.

27 50 mA

Voltage reference

V

ref

Reference Input Voltage, Iload=1mA
TSM1011 1% precision
TSM1011A 0.5% precision

T

amb

= 25°C

2.519

2.532

2.545

2.545

2.57

2.557

V

∆

V

ref

Reference Input Voltage Deviation Over
Temperature Range T

min.

≤ T

amb

≤ T

max.

20 30 mV

RegLine Reference input voltage deviation over

Vcc range.

Iload = 5mA 20 mV

RegLoad Reference input voltage deviation over

output current.

Vcc = 18V,
0 < Iload < 10mA

10 mV

TSM1011 ELECTRICAL CHARACTERISTICS

4/9

In the above application sche matic, the TSM1 011 is us ed o n the seco ndary s ide of a f lyback adapter (or
battery charger) to provide an accurate control of voltage and current. The above feedback loop is made
with an optocoupler.

Fig. 1: Inter nal Sche m atic

Fig. 2: Typical Adapter Application Using TSM1011

28V

Vcc

Cv-

Out

GndCc-

Cc+

Cv+

Vref

1

4

5

6

3

2

7

8

CV

CC

D

+

R2

R1

Rsense

Rvc1
22K

Cvc1

2.2nF

Ric1
22K

To primar y

OUT+

OUT-

+

Cic1

2.2nF

Load

IL

Ric2
1K

R5
1K

R4
10K

R3
100

IL

Vsense

28V

Vcc

Cv-

Out

GndCc-

Cc+

Cv+

Vref

1

4

5

6

3

2

7

8

CV

CC

TSM1011

Voltage and Current Control TSM1011

5/9

5 VOLTAGE AND CURRENT CONTROL

5.1 Voltage Control

The voltage loop is controlled via a first
transconductance operational amplifier, the
resistor bridge R

1

, R2, and the optocoupler which

is directly connected to the output.
The relative values of R

1

and R2 should be

chosen in accordance with

Equation 1

:

Equation 1

where V

out

is the desired output voltage.

To avoid discharge of the load, the resistor bridge
R

1

, R2 should have high impedance. For this type
of application, a total value of 100kΩ (or more)
would be appropriate for the resistors R

1

and R2.

For example, if R

2

= 100kΩ, V

out

= 4.10V,

V

ref

=2.5V, then R1 = 41.9KΩ.

Note: If the low drop diode is to be inserted between the

load and the voltage reg ulation resistor bridge to
avoid current flowing from the load through th e
resistor bridge, this drop should be taken into
account in the above calculations by replacing

V

out

by (V

out

+ V

drop

).

5.2 Current control

The current loop is controlled via the second
transconductance operational amplifier, the sense
resistor R

sense

, and the optocoupler.

V

sense

threshold is achieved externally by a

resistor bridge tied t o the V

ref

voltage reference.
Its midpoint 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 in

Figure 3

. The
resistors of this bridge are matched to provide the
best precision possible.

The control equation verifies that:

Equation 2

Equation 2’

where I

lim

is the desired limited current, and

V

sense

is the threshold voltage for the current

control lo op.
Note that the R

sense

resistor should be chosen
taking into account the maximum dissipation
(P

lim

) through it during full load operation.

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
transconductance operational amplifiers are
common (to the output of the I C). This makes an
ORing function which ensures that whenever t he
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

R

1

R

2

V

ref

V

out

V

ref

–

---------------------------





⋅

=

R

senseIlim

⋅

V

sense

=

V

sense

R

5

V

ref

R4R

5

+

--------------------⋅=

I

lim

R5V

ref

⋅

R4R

5

+()

R

sense

⋅

------------------------------------------------=

P

lim

V

senseIlim

⋅=

Vout

Iout

Voltage regulation

Current regulation

TSM1011 Vcc : independent power supply

0

Secondary current regulation

TSM1011 Vcc : On power output
Primary current regulation

TSM1011 Compensation

6/9

6 COMPENSATION

The voltage-control transconduc tanc e operat iona l
amplifier can be fully compensated. Both its
output and negative inp ut are directly accessible
for external compensation components.

An example of a suitable compensation network is
shown in

Figure 5

. It consists of a capacitor

C

cv1

=2.2nF and a resistor R

cv1

=22KΩ in series.

The current-control transconductance operationa l
amplifier can be fully compensated. Both of its
output and negative inp ut are directly accessible
for external compensation components.

An example of a suitable compensation network is
shown in

Figure 5

. It consists of a capacitor

C

ic1

=2.2nF and a resistor R

ic1

=22KΩ in serie s .

Fig. 4: Schematic of compensation network

7 START UP AND SHORT CIRCUIT CONDITIONS

Under start-up or short-circuit conditions the
TSM1011 is not provided with a high enough
supply voltage. This is due to the fact that the chip
has its power supply line in common with the
power supply line of the system.

Therefore, the current limitation can only be
ensured by the primary PWM module, which
should be chosen accordingly.

If the primary current limitation is not considered
to be precise enough for the application, then a
sufficient supply for the TSM1011 has to be
ensured under all conditions. This means that it is

necessary to add some circuitry to supply the chip
with a separate power line. This can be achieved
in numerous ways, including an additional winding
on the transformer.

+

CS

DS

D

R2

R1

Rsense

Rvc1
22K

Cvc1

2.2nF

Ric1
22K

To primar y

OUT+

OUT-

+

Cic1

2.2nF

Load

IL

Ric2
1K

R5
1K

R4
10K

R3
100

IL

Vsense

+

Rlimit

Vcc

28V

Vcc

Cv-

Out

GndCc-

Cc+

Cv+

Vref

1

4

5

6

3

2

7

8

CV

CC

TSM1011

Voltage clamp TSM1011

7/9

8 VOLTAGE CLAMP

The schematic in

Figure 5

shows how to realize a
low-cost power supply f or the TSM1011 (with no
additional windings).

Please pay attention to the fact that in the
particular case presented here, this low-cost
power supply can reach voltages as high as twice
the voltage of the regulated line.

Since the Absolute Maximum Rating of the
TSM1011 supply voltage is 28V. In the aim to
protect he TSM1011 against such how voltage
values a internal zener clamp is integrated.

Fig. 5: Clamp voltage

R

limitIvzVccVz

–()⋅=

Vz

28V

Vcc

Rlimit

Vcc

Ivz

TSM1011

TSM1011 PACKAGE MECHANICAL DATA

8/9

9 PACKAGE MECHANICAL DATA

DIM.

mm. inch

MIN. TYP MAX. MIN. TYP. MAX.

A 1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065

B 0.33 0.51 0.013 0.020

C 0.19 0.25 0.007 0.010

D 4.80 5.00 0.189 0.197

E 3.80 4.00 0.150 0.157

e 1.27 0.050

H 5.80 6.20 0.228 0.244

h 0.25 0.50 0.010 0.020

L 0.40 1.27 0.016 0.050

k ˚ (max.)

ddd 0.1 0.04

SO-8 MECHANICAL DATA

0016023/C

8

PACKAGE MECHANICAL DATA TSM1011

9/9

10 PACKAGE MECHANICAL DATA

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