SGS Thomson Microelectronics TSM1051CDT, TSM1051, TSM1051CD, TSM1051CLT Datasheet

TSM1051

CONSTANT VOLTAGE AND CONSTANT CURRENT

CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS

■ CONSTANT VOLTAGE AND CONSTANT

CURRENT CONTROL

■ LOW VOLTAGE OPERATION

■ PRECISION INTERNAL VOLTAGE

REFERENCE

■ LOW EXTERNAL COMPONENT COUNT

■ CURRENT SINK OUTPUT STAGE

■ EASY COMPENSATION

■ LOW AC MAINS VOLTAGE REJECTION

DESCRIPTION

TSM1051 is a highly integrated solution for SMPS applications requiring CV (cons tant 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 charg er) to set the voltage regulation by dividing the desired output voltage to match the internal voltage reference value.

* a sense resist or 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 sma llest packa ge

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

APPLICATIONS

■ ADAPTERS

■ BAT TERY CHARGERS

ORDER CODE

Part Number

TSM1051CLT 0 to 85°C • M801 TSM1051CD 0 to 85°C • M1051C

L = Tiny Package (SOT23-6) - only available in Tape & Reel (LT) D = Small Outline Package (SO) - also available in Tape & Reel ( DT)

(Plastic Package)

Temperature

Range

SOT23-6

Package

Marking

SO8

(Plastic Micro package)

PIN CONNECTIONS (top view)

SOT23-6 SO8

Gnd

Vsense

Out Ictrl

6Vctrl

Vcc

Vctrl Gnd

Vcc

Vsense

Out

Ictrl

NcNc

January 2002

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TSM1051

PIN DESCRIPTION SOT23-6 Pinout

Name Pin # Type Function

Vcc 6 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

Vsense 5 Analog Input Input Pin of the Current Control Loop

SO8 Pinout

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

Vsense 3 Analog Input Input Pin of the Current Control Loop

NC 5 NC 4

ABSOLUTE MAXIMUM RATINGS

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 0 to 85 °C

Tj Maximum Junction Temperature 150 °C Rthja Thermal Resistance Junction to Ambient SO8 package 130 °C/W Rthja Thermal Resistance Junction to Ambient SOT23-6 package 250 °C/W

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TSM1051

OPERATING CONDITIONS

Symbol Parameter Value Unit

Vcc DC Supply Conditions 2.5 to 12 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

Voltage Control Loop

Gmv Transconduction Gain (Vctrl). Sink

Current Only

Vref

Voltage Control Loop Reference

Iibv Input Bias Current (Vctrl) Tamb

Current Control Loop

Gmi Transconduction Gain (Ictrl). Sink

Current Only

Vsense

Current Control Loop Reference

Iibi Current out of pin ICTRL at -200mV Tamb

Output Stage

Vol Low output voltage at 10 mA sinking

current

Ios Output Short Circuit Current. Output to

Vcc. Sink Current Only

1. If the vol tage on V CTRL (the negati ve input of the a m pl i fier) is hi gher than the pos i tive ampli f i er input (V ref=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 i nternal voltage reference dev i ation as well as the input offset voltage of th e trans- conductance operational amplifier. The internal V ol tage Refer ence is fixed by bandgap, and trimmed to 0.5% accuracy at room temperature.

3. When the positive inp ut at ICTRL is lo wer than -200mV, and t he voltage i s decrease d by 1mV, the si nking 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 ref erence deviation as wel l as the input of f set voltage o f the trans-c onduction operatio nal am plifier.

Tamb

0 < Tamb < 85°C

Tamb 0 < Tamb < 85°C

0 < Tamb < 85°C

T amb 0 < Tamb < 85°C

Iout = 2.5mA Tamb 0 < Tamb < 85°C

0 < Tamb < 85°C

Tamb 0 < Tamb < 85°C

1.1

2mA

1.2

1 3.5

mA/mV

2.5

1.198

1.186

1.21 1.222

1.234

100 nA

1.5 7 mA/mV

196 192

200 204

208

25 50 µA

200 mV

27 35

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