AA1850 Agamem Microelectronic, AA1850 Datasheet - Page 4

• Manufacturer Part Number: AA1850
• Description: High-side Current Monitor
• Manufacturer: Agamem Microelectronic

PRELIMINARY
■ APPLICATION CIRCUIT
©Copyright Agamem Microelectronics Inc.
AGAMEM MICROELECTRONICS INCOPERATION RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER
NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. AGAMEM DOES NOT
ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCTS OR CIRCUIT DESRIBED
HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
Where R
circuitry that requires monitoring, V
accuracy, size and power rating.
The following lines describe how to scale a load current to an output voltage.
E.g.
A 1A current is to be represented by a 100mV output voltage:
A. Choose the value of R
B. Choose R
For example V
Rearranging E1 for
R
OUT
= 0.1 / (0.1 x 0.01) = 100Ω
LOAD
OUT
represents any load including DC motors, a charging battery or further
Agamem Microelectronics Inc.
to give V
SENSE
Vin
R
= 100mV at 1.0A. R
OUT
SENSE
OUT
gives:
V
= 100mV, when V
Rout
OUT
2
to give 50mV > V
Rsense
V
= 0.01 x
R
SENSE
SENSE
OUT
3
=
can be selected on specific requirements of
=
4
(E1)
V
V
SENSE
V
1
OUT
IN
SENSE
Vout
-
SENSE
/(
V
SENSE
= 0.1/1.0 => 0.1Ω.
LOAD
V
x
SENSE
HIGH-SIDE CURRENT MONITOR
R
= 100mV.
> 500mV at full load.
OUT
x 0.01)
www.agamem.com.tw
Rload
AA1850
2008/4/8