Current Sensing And Demodulation; Figure 66: Steval-Isb044V1 Evaluation Board: Current Sensing; Figure 67: Steval-Isb044V1 Evaluation Board: Current Demodulation - ST STEVAL-ISB044V1 User Manual

Board assembly and layout
8.4

Current sensing and demodulation

54/57

Figure 66: STEVAL-ISB044V1 evaluation board: current sensing

VRSENSE
R307
0.022R
Direct GND line connection
Warning:
R308 GND is done through
a trace connected to GND
on Rsense R307
Don't mix this track with
ground plane

Figure 67: STEVAL-ISB044V1 evaluation board: current demodulation

U501
R517
1 +IN
IDEMOD
+
1M 2 V-
3 -IN -
TSV521ICT
C513
C512
22PF
100NF
3
R520
330R
Current demod (U501, R and C) near
Current amplifier output (Q301)
12
CURRENT_DEMOD
CURRENT_DEMOD
TANK_VOLTAGE
15
TANK_VOLTAGE
16
VTARGET
17
QFOD_ADC
18
COIL_TEMP
19
ISENSE
20
VMAIN
DocID031141 Rev 1
VDD_STWBC
R302 R303
1M 100K
IDEMOD
R304
470K
R305
470K
C308
470PF
R308 Q301
10K NPN-NPN
C307 near
Isense input (pin 19)
C307
VDD_STWBC
C508
VDD_STWBC
2.2 µF
C509
R518 TP508
V+ 5 100NF
100K
C510
4 CURRENT_DEMOD
OUT
100NF
R519
C511
22K
220PF
D504
2
1
BAV99W
R517
VTARGET
QFOD_ADC
ISENSE
VBUS
TP301
ISENSE
R306 C307
470K 22NF
Current amplifier
(Q301, R and C)
near VRSENSE
Q301
R308
C501, R518, R519
near Current_demod input
(U500 pin 12)
C510
R519 R518
C513
Q301
U501 Q301
C503
C513
L501
R517
C503
U501
C512 C511 L502
C501
L502
C502
C112
C502
C512 C511
R505
C112
Q301
C100
Q301
C100
UM2301
R308
R308
R505