IC-SP-06027 R0
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 1ms (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
1ms or less.
RU
VCC(15V)
C0
RW
CB
VCC
VB
VB supply
Clock
VCC
FG
FG
HU
HV
HW
C+
RV
D2
C2
+
-
C
-
D1
+
VS
-
C1
CL
VS1
VS2
Charge Pump
Filter Circuit
DM
Micro Controller
VSP
Motor Rotating
Direction
Top Arm
Driver
Hall ICs
MU
MV
MW
PWM Comparator
+
-
CMP
3-Phase
Distributor
All off
Bottom
arm off
+
-
CMP
Bottom Arm
Driver
Over Current Sense
-
Motor
SAW wave
Generator
Clock
VCC
LVSD
GL
+
Vref
CR
VTR
RTR
CTR
RS
GH1
GH2
Note : Inside of bold line
shows ECN30206
RS
Fig.5-11. Block diagram of ECN30206
Input signal
Output signal
About 1
msec
or less
Filter Circuit
About 1
msec
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
-