ST EVALSTGAP2S, Руководство пользователя, Страница: 7 / 12

1.3 Drivers logic input signals
Drivers logic input signals can be applied through the dedicated pins of J9 or J10 connector (refer to Table 1 for
details).
It is possible to reduce the required driving signals exploiting the onboard jumpers according to
Table 6 .
Table 6. Input signals settings
Input configuration Description Jumper Default condition
IN+_H = IN-_L
The same input signal is
applied to IN+ of high-side
driver U2 and IN- of low-side
driver U1
JP5 Closed
IN+_L = IN-_H
The same input signal is
applied to IN- of high-side
driver U2 and IN+ of low-side
driver U1
JP6 Closed
IN-_L = IN-_H
The same input signal is
applied to IN- of high-side
driver U2 and IN- of low-side
driver U1
JP7 Open
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
Table 7 .
Table 7. Gate driver resistors and jumper settings
Gate driver Feature JP8, JP10 JP9, JP11 Turn-on resistor Turn-off resistor
STGAP2SM
(1)
Separated outputs Open Closed R5, R1 R4, R2
STGAP2SCM (2) Miller Clamp Closed Open R5, R1
R5 // R4
R1 // R2
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
Drivers logic input signals
UM2754 - Rev 1
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