Datasheet

TMCC160 motionCookie™ (Rev. 1.00 / 2015-Nov-16)
© 2015 TRINAMIC Motion Control GmbH & Co. KG, Hamburg, Germany
Read entire DATASHEET USER MANUAL before use of product. Terms of delivery and right
s to technical change
reserved. Download newest version at: www.trinamic.com
19/39


=


±1
Formulae 5: MOSFET Switch Slope Calculation
To avoid that negative voltage spikes (high frequency oscillation) reach the
TMCC160 gate driver output pins during switch events, high- and low-side gate
series resistors (R) as well as optional clamp diodes (D) on low-side gate output
are recommend.
The negative voltage oscillation roots from the recovery effect of the MOSFETs
body diodes during switching. A clamp circuit for BMx pins is integrated in the
TMCC160.
Gate Charge Resistors Table
GATE CHARGE: MIN GATE SERIES RESISTOR [Ω]: LOW SIDE CLAMP DIODE:
<50nC 10R optional
50..100nC 4.7R recommended
>100nC 2.2R required
Table 5: Gate Charge Resistor and Clamp Diode Recommendation
NOTE:
→ Values in table above have to be validated in layout.
Diagram: MOSFET
Parameters
During Switch
Event
Qg gate charge [nC]
Vgs gate to source voltage [V]
Rdson drain source resistance [R]
Rdson
Q Miller
Figure 12: MOSFET Parameters During Switch Event
4.5.10
Gate
Driver Clamp
Diodes
Depending on the gate charge, the following gate series resistors are recommended: