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M81019FP

High Voltage Half-Bridge Driver 1200 Volts/±1 Ampere

Powerex 

Powerex, Inc., 200 E. Hillis Street, Youngwood, Pennsylvania 15697-1800 (724) 925-7272

M81019FP

HVIC, High Voltage Half-Bridge Driver

1200 Volts/±1 Ampere

7. Power Start-Up Sequence

At power supply start-up the following sequence is recommended when bootstrap supply topology is used.

1. Set VCC.

2. Make sure FO is in high level.

3. Set LIN to high level and set HIN to low

level so that bootstrap capacitor will

charge.

4. Set LIN to low level.

NOTE: If two power supplies are used to supply VCC

and VBS individually, it is recommended to set VCC

first, then set VBS.

VCC

FO

HIN

LIN

LOUT

8. Low Impedance NMOS Output Timing Diagram

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.

HIN/LIN = 0

VBS/VCC

P1

VPG/VN1G

Cres

VO

N1

VN2G

LOW IMPEDANCE NMOS

N2

VS/VNO

Cies

When HIN/LIN is low level and VOUT voltage is lower than low impedance NMOS input threshold voltage, the low impedance NMOS

continues to discharge the parasitic current through Cres.

HIN/LIN

VPG

VN1G

P1 On

N1 Off

P1 Off

N1 On

Low Impedance NMOS

Input Threshold

P1 On

N1 Off

VOUT

VN2G

N2 Off

N2 Off

N2 On

Tw

Low Impedance NMOS Stays

Turned On if Tw does not exceed tVNO2

8

8/05

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