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CURRENT CONTROL

REFERENCE

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

ORDER CODE

L = Tiny Package (SOT23-6) - 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

LD

TSM1051CLT

0 to 85°C

•

M801

TSM1051CD

0 to 85°C

•

M1051C

L

SOT23-6

(Plastic Package)

D

SO8

(Plastic Micro package)

1

2

34

5

6

Vctrl

Gnd

Vcc

Vsense

Out

Ictrl

1

2

3

45

6

Vctrl

Gnd

Vcc

Vsense

Out

Ictrl

Nc

Nc

SOT23-6

SO8

7

8

January 2002

TSM1051

CONSTANT VOLTAGE AND CONSTANT CURRENT

CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS