STMicroelectronics Advanced IGBT/MOSFET driver DEMOTD350 DEMOTD350 Data Sheet

Doc ID 9525 Rev 6

9/17

In order to ensure the proper operation of the 2-level turn-off function, the input ON time 
(T

win

) must be greater than the T

winmin

 value:

T

winmin

=T

a

+2*R

del

*C

off

R

del

 is the internal discharge resistor and C

off

 is the external timing capacitor.

Input signals smaller than T

a

 are ignored. Input signals larger than T

winmin

 are transmitted to 

the output stage after the T

a

 delay with minimum width distortion (

Δ

T

w

=T

wout

-T

win

).

For an input signal width T

win

 between T

a

 and T

winmin

, the output width T

wout

 is reduced 

below T

win

 (pulse distortion) and the IGBT could be partially turned on. These input signals 

should be avoided during normal operation.

The output stage is able to sink 2.3 A and source 1.5 A typical at 25 °C (1.2 A/0.75 A 
minimum over the full temperature range). Separated sink and source outputs allow 
independent gate charge and discharge control without an extra external diode.

Fault output is used to signal a fault event (desaturation, UVLO) to a controller. The fault pin 
is designed to drive an optocoupler.

Undervoltage detection protects the application in the event of a low VH supply voltage 
(during start-up or a fault situation). During undervoltage, the OUTH pin is open and the 
OUTL pin is driven low (active pull-down for VH>2 V, passive pull-down for VH<2 V). Fault 
output signals the undervoltage state and is reset only when undervoltage state disappears.

VH

OUT

2V

UVH

UVL

Vccmin

FAULT

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