SGS Thomson Microelectronics TSM105, TSM105CLT, TSM105CDT, TSM105CD Datasheet

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■ CONSTANT VOLTAGE AND CONSTANT

CURRENT CONTROL

■ LOW VOLTAGE OPERATION

■ PRECISION INTERNAL VOLTAGE REFER-

ENCE

■ LOW EXTERNAL COMPONENT COUNT

■ CURRENT SINK OUTPUT STAGE

■ EASY COMPENSATION

■ LOW AC MAINS VOLTAGE REJECTION

DESCRIPTION

TSM105 is a hi ghly integrated solut ion for SMPS applications requiring CV (cons tant voltage) and CC (constant current) mode.

TSM105 integrates one voltage reference, two operational amplifiers (with OR ed outputs - common collectors), and a current sensing circuit.

The voltage reference combined with one operational amplifier mak es it an ideal voltage cont roller, 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 charg er) to set the voltage regulation by dividing the desired output voltage to match the internal v oltage reference value.

* a sense resistor whos e valu e and allowable dissipation power need to be chosen according to the internal voltage threshold.

* optional compensation components (R and C). TSM105, housed in o ne of the smallest package

available, is ideal for space shri nked applications such as adapters and battery chargers.

APPLICATIONS

■ ADAPTERS

■ BAT TERY CHARGERS

ORDER CODE

L = Tiny Package (SOT23-5) - only available in Tape & Reel (LT) D = Small Outline Package (SO) - also available in Tape & Reel (DT)

PIN CONNECTIONS (top view)

Part

Number

Temperature

Range

Package

Marking

TSM105CLT 0 to 85°C • M105 TSM105CD 0 to 85°C • TSM105

SOT23-5

(Plastic Package)

SO8

(Plastic Micropackage)

1 2 34

5Vctrl

Gnd

Vcc

IctrlOut

1 2 3 45

Vctrl Gnd Vcc

Out Ictrl

Nc Nc

SOT23-5

SO8

September 2001

TSM105

CONSTANT VOLTAGE AND CONSTANT CURRENT

CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS

TSM105

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PIN DESCRIPTION SOT23-5 Pinout

SO8 Pinout

ABSOLUTE MAXIMUM RATINGS

Name Pin # Type Function

Vcc 5 Power Supply Positive Power Supply Line Gnd 2 Power Supply Ground Line. 0V Reference For All Voltages Vctrl 1 Analog Input Input Pin of the Voltage Control Loop

Ictrl 4 Analog Input Input Pin of the Current Control Loop

Out 3 Current Sink Output Output Pin. Sinking Current Only

Name Pin # Type Function

Vcc 2 Power Supply Positive Power Supply Line Gnd 8 Power Supply Ground Line. 0V Reference For All Voltages Vctrl 1 Analog Input Input Pin of the Voltage Control Loop

Ictrl 6 Analog Input Input Pin of the Current Control Loop

Out 7 Current Sink Output Output Pin. Sinking Current Only

NC 3 NC 4 NC 5

Symbol DC Supply Voltage Value Unit

Vcc DC Supply Voltage 14 V

Vi Input Voltage -0.3 to Vcc V

Top Operating Free Air Temperature Range -55 to 125 °C

Tj Maximum Junction Temperature 150 °C Rthja Thermal Resistance Junction to Ambient SO8 package 130 °C/W Rthja Thermal Resistance Junction to Ambient SOT23-5 package 250 °C/W

TSM105

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OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS Tamb = 25°C and Vcc = +5V (unless otherwise specified)

Symbol Parameter Value Unit

Vcc DC Supply Conditions 2.8 to 12 V

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

1.05

1.2

2mA

Voltage Control Loop

Gmv Transconduction Gain (Vctrl). Sink

Current Only

1. If the vol tage on VCTRL (the negative input of th e amplifier) is high er than the positive am pl i fier input (Vref=1. 210V), and it is increased by 1mV, the sinking current at the output OUT will be increased by 3.5mA.

Tamb 0 < Tamb < 85°C

1 3.5

2.5

mA/mV

Vref

Voltage Control Loop Reference

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 we l l as the i nput offs et volta ge of the trans-conductance operati onal amplifier . The internal V ol t age Referen ce is fixed by bandgap, and trimm ed to 0.5% accuracy at room temperaure.

Tamb 0 < Tamb < 85°C

1.198

1.186

1.21 1.222

1.234

Iibv Input Bias Current (Vctrl) Tamb

0 < Tamb < 85°C

100

Current Control Loop

Gmi Transconduction Gain (Ictrl). Sink

Current Only

3. When the positive input at ICTRL is lower than -20 0mV, and the vol t age is decreased by 1mV, t he sinking cur rent at the out put OUT will be increased by 7mA.

T amb 0 < Tamb < 85°C

1.5 7 4

mA/mV

Vsense

Current Control Loop Reference

4. The internal current sense threshold is set to -200mV. The current control loop precision takes into account the cumulative effects of the internal vo l tage reference deviation as well as the in put offset volta ge of the trans -c onductance operational am plifier.

Iout = 2.5mA Tamb 0 < Tamb < 85°C

196 192

200 204

208

Iibi Current out of pin ICTRL at -200mV Tamb

0 < Tamb < 85°C

25 50

µA

Output Stage

Vol Low output voltage at 10 mA sinking

current

Tamb 200 mV

Ios Output Short Circuit Current. Output to

Vcc. Sink Current Only

Tamb 0 < Tamb < 85°C

27 35

50 mA

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