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UM1557 Datasheet(PDF) 22 Page - STMicroelectronics

Part # UM1557
Description  The aim of this document is to give the design engineer
PDF  111 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1557 Datasheet(HTML) 22 Page - STMicroelectronics

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Analogue current sense
UM1557
22/111
Doc ID 023521 Rev 2
3.2
Principle of operation
The simplified block diagram of the analog current sense is illustrated in Figure 16.
Figure 16.
Analog current sense simplified block diagram
The SenseMOS is a scaled down copy of the MainMOS according to a defined geometric
ratio, driven by the same gate control circuit as the MainMOS.
The current flowing through the MainMOS is mirrored by the SenseMOS.
The current delivered by the current sense pin is regulated by the current sense amplifier
through the P channel MOSFET M1 so that:
and consequently
where
encloses the geometric ratio, the current sense amplifier offset and various process
parameter spreads.
Care must be taken in order to ensure the Isense is proportional to IOUT. Indeed, the
maximum drop across the RSENSE is internally limited to approx. 8.5 V as specified in the
Main MOS
Sense MOS
M1
Cursense Amplified
INPUT
M2
58V
VSENSEH
Overload ,
OL in off -state
VOUT < 6V
(VCC > 8V)
Vcc
OUT
To uC ADC
RPROT
RSENSE
out
Main
DS
sense
sense
ds
Sense
DS
Main
DS
I
R
I
R
V
V
⋅
=
⋅
→
=
_
_
_
_
K
I
R
V
out
sense
sense
/
⋅
=
Main
DS
sense
ds
R
R
K
_
_
/
∝



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