Drivers Logic Input Signals; Drivers Gate Resistors; Power Stage Decoupling; Table 6. Input Signals Settings - ST EVALSTGAP2S User Manual

1.3

Drivers logic input signals

Drivers logic input signals can be applied through the dedicated pins of J9 or J10 connector (refer to
details).
It is possible to reduce the required driving signals exploiting the onboard jumpers according to
Input configuration
IN+_H = IN-_L
IN+_L = IN-_H
IN-_L = IN-_H
1.4

Drivers gate resistors

The gate resistors are selected based on the selected power switch and application topology.
It is possible to evaluate different gate drivers of the STGAP2S family by setting few jumpers according to
Gate driver
STGAP2SM
STGAP2SCM
1. • The presence of D4 and D5 does not influence turn-off speed and these diodes are not required in the final
application. D4 and D5 are mounted on board to speed-up evaluation of STGAP2SC (Miller Clamp version).
2. • R4, D4, R2 and D5 are only required if differentiated turn-on and turn-off speed are required by the user.
1.5

Power stage decoupling

As for all switching applications, high voltage supply is properly decoupled and appropriate decoupling capacitor
is connected to the board to reduce bus ringing and power switch overvoltage spikes during operation.
The board is equipped with a small 1.25 kV DC rated film capacitor (C2) in a convenient position to operate
more safely the power switches. Depending on the application, bus decoupling can be modified also by using the
provided footprint and holes for the bus capacitors C1, C2, C34, C35, C36.
IMPORTANT NOTE: DANGER OF DEATH!
High voltage present on the board! Before operating on the board, ensure that all capacitors are
discharged.
UM2754 - Rev 1
Table 6.
Description
The same input signal is
applied to IN+ of high-side
driver U2 and IN- of low-side
driver U1
The same input signal is
applied to IN- of high-side
driver U2 and IN+ of low-side
driver U1
The same input signal is
applied to IN- of high-side
driver U2 and IN- of low-side
driver U1
Table 7. Gate driver resistors and jumper settings
Feature
(1) Separated outputs
(2) Miller Clamp
Input signals settings
Jumper
JP5
JP6
JP7
JP8, JP10 JP9, JP11
Open Closed
Closed Open
Drivers logic input signals
Table 1
Table 6.
Default condition
Closed
Closed
Open
Turn-on resistor Turn-off resistor
R5, R1 R4, R2
R5 // R4
R5, R1
R1 // R2
UM2754
for
Table 7.
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