M81019FP Powerex Power Semiconductors, M81019FP Datasheet - Page 8

• Manufacturer Part Number: M81019FP
• Description: High Voltage Half-Bridge Driver
• Manufacturer: Powerex Power Semiconductors

8
Powerex, Inc., 200 E. Hillis Street, Youngwood, Pennsylvania 15697-1800 [phone]
M81019FP
HVIC, High Voltage Half-Bridge Driver
1200 Volts/±1 Ampere
7. Power Start-Up Sequence
8. Low Impedance NMOS Output Timing Diagram
1. Set V
2. Make sure F
3. Set L
4. Set L
NOTE: If two power supplies are used to supply V CC
and V BS individually, it is recommended to set V CC
first, then set V BS .
At power supply start-up the following sequence is recommended when bootstrap supply topology is used.
Output configuration is shown in the following figure. At turn-off an n-channel NMOS with sink current up to 1A is used to offer a low
impedance path (AKA “low impedance NMOS) to prevent the power switch from turning itself on because of the parasitic Miller
capacitor in the power switch.
When H
continues to discharge the parasitic current through C
level so that bootstrap capacitor will
charge.
IN
IN
CC
H IN /L IN = 0
IN
to high level and set H
to low level.
H
.
/L
IN
V
V
V
IN
V
N1G
OUT
N2G
/L
O
PG
is low level and V
IN
is in high level.
N1 Off
N2 Off
P1 On
IN
OUT
to low
LOW IMPEDANCE NMOS
V
voltage is lower than low impedance NMOS input threshold voltage, the low impedance NMOS
PG
/V
V
N2G
N1G
L
V
OUT
H
L
CC
F
IN
IN
O
Turned On if Tw does not exceed tV NO2
res
Low Impedance NMOS
Input Threshold
N1
P1
.
Low Impedance NMOS Stays
N1 On
N2 On
P1 Off
N2
V
V
BS
S
/V
/V
NO
CC
C
Tw
res
V
O
C
ies
P1 On
N1 Off
N2 Off
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