Datasheet

TMC603 DATA SHEET (V. 1.05 / 11. Mar. 2009) 36
Copyright © 2008 TRINAMIC Motion Control GmbH & Co. KG
Current measurement block
DC-Characteristics, Timing-Characteristics
V
VM
= 24 V, V
VCC
= 5.0 V
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Amplification of voltage
V
BMX
to V
CURX
for positive voltage (V
BMX
> 0V)
A
CURLO+
SENSE_HI = GND
-4.3
-4.6
-4.9
V/V
A
CURHI+
SENSE_HI = VCC
-17
-18.0
-19
V/V
Amplification of voltage
V
BMX
to V
CURX
for negative voltage (V
BMX
< 0V)
A
CURLO-
SENSE_HI = GND
-4.1
-4.4
-4.7
V/V
A
CURHI-
SENSE_HI = VCC
-16
-17.1
-18
V/V
Zero current level at CURX
V
0CURX
V
VCC
/3
-50mV
V
VCC
/3
V
VCC
/3
+50mV
V
Measurement voltage range at
V
BMX
V
BMX
SENSE_HI = GND
-250
250
mV
SENSE_HI = VCC
-60
60
mV
Ripple voltage / hold step noise
at output
note 2)
V
CURX
V
BMX
= 0V
SENSE_HI = GND
17
26
mV
V
BMX
= 0V
SENSE_HI = VCC
50
75
mV
Minimum low side on time for
current measurement
(Delay from BLx going active to
CURx tracking amplified signal)
t
BLHICURX
SAMPLEx = VCC
3.5
5.3
7.2
µs
Delay from SAMPLEx going
active to CURx tracking
amplified signal
t
SMPHICURX
SAMPLEx = VCC
t
BLHICURX
/ 2
µs
Delay from BLx or SAMPLEx
going inactive to CURx hold
t
BLXLO
0
µs
Sample and hold drop during
hold period
dV
CURX
0.001
1.6
V/s
Auto zero drop of current
amplifier during sampling period
(low side on)
dV
CURX
0.003
3
V/s
Minimum initial auto zero period
(low side off or SAMPLEx low)
after power on
t
BLXLO0
5
µs
Minimum sample period after
t
BLHICURX
for a 100% current step
t
BLXHIADD
1
µs
Output current limit at CURx
I
CURX
Current sourcing
0.45
mA
2) Note on first ICs dated before 20/2009:
CURx outputs are sensible to ripple voltage on VCC pin and frequency below 5MHz. Ripple voltage is amplified by 1/3 * Set
amplification, i.e. factor 1.5 with SENSE_HI low and factor 6 with SENSE_HI high. Thus, it is suggested to use 5VOUT only for
VCC supply, if possible, if exact measurements are required.