TS1100-25 datasheet(7/11 Pages) TOUCHSTONE

Numer części	TS1100-25

Szczegółowy opis	A 1uA, 2V to 25V SOT23 Precision Current-Sense Amplifier

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Producent	TOUCHSTONE [Touchstone Semiconductor Inc]

Strona internetowa	http://www.touchstonesemi.com

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TS1100

TS1100DS r1p0

Page 7

RTFDS

PIN FUNCTIONS

LABEL

FUNCTION

SOT23

5

RS+

External Sense Resistor Power-Side Connection

4

RS-

External Sense Resistor Load-Side Connection

1, 2

GND

Ground. Connect these pins to analog ground.

3

OUT

Output Voltage. VOUT is proportional to VSENSE = VRS+ - VRS-

BLOCK DIAGRAM

DESCRIPTION OF OPERATION

The internal configuration of the TS1100

– a

unidirectional high-side, current-sense amplifier - is

based on a commonly-used operational amplifier (op

amp) circuit for measuring load currents (in one

direction) in the presence of high-common-mode

voltages. In the general case, a current-sense

amplifier monitors the voltage caused by a load

current through an external sense resistor and

generates an output voltage as a function of that load

current. Referring to the typical application circuit on

Page 1, the inputs of the op-amp-based circuit are

connected across an external RSENSE resistor that

is used to measure load current. At the non-inverting

input of the TS1100 (the RS+ terminal), the applied

voltage is ILOAD x RSENSE. Since the RS- terminal is

the non-inverting input of the internal op amp, op-amp

feedback action forces the inverting input of the

internal

op

amp

to

the

same

potential

(ILOAD x RSENSE). Therefore, the voltage drop across

RSENSE (VSENSE) and the voltage drop across RGAIN

(at the RS+ terminal) are equal. To minimize any

additional error because of op-amp input bias current

mismatch, both RGAINs are the same value.

Since

the

internal

p-

channel FET’s source is

connected to the inverting input of the internal op

amp and since the voltage drop across RGAIN is the

same as the external VSENSE, op amp feedback action

drives the gate of the FET such that the FET’s drain-

source current is equal to:

S

VSENSE

RGA N

Podobny numer części - TS1100-25

Producent	Numer części	Arkusz danych	Szczegółowy opis
Silicon Laboratories	TS1100-25-EG6	63Kb / 1P	This change is considered a minor change which does not affect form, fit, function, quality, or reliability.
	TS1100-25-EG6T	63Kb / 1P	This change is considered a minor change which does not affect form, fit, function, quality, or reliability.
	TS1100-25EG5	1Mb / 20P	High Side Bidirectional and Unidirectional Current Sense Amplifier

More results

Podobny opis - TS1100-25

Producent	Numer części	Arkusz danych	Szczegółowy opis
Touchstone Semiconducto...	TS1101	1Mb / 11P	A 1uA, 2V to 25V Bidirectional Precision Current-Sense Amplifier
	TSM9938	751Kb / 11P	A 1uA, SOT23 Precision Current-Sense Amplifier
	TSM9634	746Kb / 11P	A 1uA, SOT23 Precision Current-Sense Amplifier
Maxim Integrated Produc...	MAX9938	523Kb / 14P	1uA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier Rev 6; 1/11
Silicon Laboratories	TSM9938F	1Mb / 12P	SOT23 Precision Current-Sense Amplifier
Touchstone Semiconducto...	TS1102	787Kb / 11P	A 1關A, 200關VOS SOT23 Precision Current-Sense Amplifier
Maxim Integrated Produc...	MAX9938_0910	519Kb / 14P	1μA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier Rev 3; 10/09
	MAX9938	176Kb / 9P	1μA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier Rev 0; 4/08
	MAX9938	310Kb / 13P	1μA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier Rev 2; 2/09
	MAX9634	283Kb / 11P	1μA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier Rev 1; 2/10

More results

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