IC-SP-06027 R1
5-6. Internal Filter
(Applicable models: ECN30204, ECN30206, ECN30207, ECN30601, ECN30603, ECN30604)
•
Internal Filter circuit is located before the Top and Bottom arm drivers (see Fig. 5-11.).
This filter circuit removes the signal and the noise, that width is less than about 1μs (see Fig. 5-12.).
Table 5-6. shows the effective pin of the internal filter circuit.
•
The noise is coupled on Vcc line: The internal filter becomes effective, when the VCC level is dropped by
the noise, that is lower than LVSDON voltage and that width is about
1μs or less.
RU
VCC(15V)
C0
CB
VCC
VB
RV
RW
D2
C2
+ -
HU
HV
HW
C+
C-
D1
+
C1
-
CL
VS1
VS2
VS
VB supply
VCC
Clock
VB
Charge Pump
FG
FG
DM
Motor Rotating
Direction
Filter Circuit
MicroController
Top Arm
Driver
3-Phase
Distributor
All off
+
CMP
Bottom
arm off
Hall ICs
MU
MV
MW
VSP
PWM Comparator
+
CMP
Bottom Arm
Driver
Over Current Sense
Motor
SAW wave
Generator
VCC
Clock
LVSD
GL
+
Vref
GH1
GH2
CR
VTR
RTR
CTR
RS
Note : Inside of bold line
shows ECN30206
RS
Fig.5-11. Block diagram of ECN30206
Input signal
Output signal
About 1
μsec
or less
Filter Circuit
About 1
μsec
or less
Fig. 5-12. Operation of Internal Filter circuit
Table 5-6 The effective pin of the internal filter circuit
Model
ECN30204
ECN30206
ECN30207
VCC*
HU
HV
HW
VSP
CR
RS
ECN30601
ECN30603
ECN30604
VCC*
UT
VT
WT
UB
VB
WB
RS
Effective Pin
*) Effective only to the output signal of the LVSD Detection circuit.
-
20
-