IC-SP-06027 R1
5-3. Power supply sequence
(1) Power supply sequence free type
ECN30107, ECN30611, ECN30207, ECN30604, ECN30206 (below 1A), ECN30603 (below 1A)
(2) Power supply sequence setting type of the VSP-input type and 6-input type is described below.
ECN30102, ECN30105, ECN30204 : Refer to (3) (a) VSP-input type
ECN30601 : Refer to (3) (b) 6-input type
(3) How to set Power supply sequence
(a) VSP-input type
Recommended sequences are as follows:
At power-up:
VCC on --> VS on --> VSP on
At power-down: VSP off --> VS off --> VCC off
If any sequence is involved other than those specified above, please refer to Tables 5-1 and 5-2.
When the VSP is no higher than the VSAWL, the power sequence is free.
As for the sequences No. 2 and 5 in Table 5-1, if the VS line gets noisy before the VS is powered up after
the VCC and VSP are applied, the ON signal of the upper arm IGBT is reset and the motor may not start
up. In such a case, first reduce the VSP to a level no higher than the all-off operating voltage (Voff), then
apply it.
In the case of No. 4 and 6 in Table 5-1 and No. 4 and 6 in Table 5-2, see "Current Derating for Power
Sequence and Vcc Voltage" of the Product Specifications.
Table 5-1 Power up sequence (VSP-input type)
No.
1
2
3
4
5
6
(1)
VCC
VCC
VS
VS
VSP
VSP
(2)
VS
VSP
VCC
VSP
VCC
VS
(3)
VSP
VS
VSP
VCC
VS
VCC
Permit or
Inhibit
Permit
Permit
Permit
Inhibit
Permit
Inhibit
Table 5-2 Power down sequence (VSP-input type)
No.
1
2
3
4
5
6
(1)
VSP
VS
VSP
VCC
VS
VCC
(2)
VS
VSP
VCC
VSP
VCC
VS
(3)
VCC
VCC
VS
VS
VSP
VSP
Permit or
Inhibit
Permit
Permit
Permit
Inhibit
Permit
Inhibit
(b) 6-input type
Recommended sequences are as follows ;
At power-up:
VCC on
--> VS on --> "Control input" on
At power-down: "Control input" off --> VS off --> VCC off
For any sequence other than those specified above, see Tables 5-3 and 5-4.
The power sequence is free if the lower arm control inputs UB, VB, and WB are all low (L) and if the
upper control inputs UT, VT, and WT are all low (L).
In the sequences No. 2 and 5 in Table 5-3, after the VCC and "control input" are applied, when a noise
enters the VS line before VS power-up, the ON signal of the top arm IGBT can be reset and the motor
may not start up. In such a case, the control inputs (UT, VT, and WT) for the top arm should be set to low,
then power the system up again.
In the case of No. 4 and 6 in Table 5-3 and No. 4 and 6 in Table 5-4, see "Current Derating for power
supply sequence and Vcc voltage" of the product specifications.
Table 5-3 Power up sequence (6-input type)
No.
1
2
3
4
5
6
Permit or
Inhibit
VCC
VS
Permit
Control Input
VS
Permit
VCC
Control Input
VS
VCC
Permit
Control Input
VS
VCC
Inhibit
Control Input
VCC
VS
Permit
Control Input
VS
VCC
Inhibit
Control Input
(1)
(2)
(3)
Table 5-4 Power down sequence (6-input type)
No.
1
2
3
4
5
6
Permit or
Inhibit
VS
VCC
Permit
Control Input
VS
VCC
Permit
Control Input
VCC
VS
Permit
Control Input
VCC
VS
Inhibit
Control Input
VS
VCC
Permit
Control Input
VCC
VS
Inhibit
Control Input
(1)
(2)
(3)
-
17
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