Everest CORE - Product Manual |
Application Guide
INGENIA | 08/01/2019
33
Design Notes
•
OVERVOLTAGE net must be tied to any of the GPOx pins of Everest CORE Interface connector (pins 55, 56, 57
or 43). Then,
the Everest CORE must be configured
to map the Overvoltage signalling functionality to this
specific GPO, which will then stop working as a general purpose digital output. Check out the
to know how to configure this feature.
•
Connect this protection as close to the Everest CORE as possible. If an Inverse Polarity Protection is also
implemented, connect their SUP_PROTECTED nets together.
•
The positive terminal of the power resistor could be connected to SUP_PROTECTED net or externally to the
positive terminal of the power supply.
•
The net-tie between the GND_D and the GND_P allows sharing the same reference voltage while controlling
the return path in the layout phase.
•
C1 is a decoupling capacitor for U1.
•
3.3 V could be enough to excite the gate of Q1, although at least 4.5 V is recommended to reduce power
losses. In any case, it is not recommended to drive Q1 directly from a GPOx pin of Everest CORE.
•
The wheeling diode D1 provides a discharge path for the energy stored in the power resistor (specially for
wirewound type of resistor).
Bill of materials
Designato
r
Part Number
Manufacturer
Package
Value / Description
C1
GRM155R71C104KA88
D
Murata
0402
Ceramic capacitor, 100 nF, 16 V, X7R
D1
SK310A-LTP
Micro
Commercial
SMA /
DO-214AC
Diode Schottky, 3 A, 100 V
Q1
BSZ150N10LS3 G
Infineon
TSDSON-8
Logic-level N-Channel MOSFET, 100 V,
40 A
R1
CRCW040247R0FKED
HP
Vishay
0402
Thick film resistor, 47
Ω
, 1 % tolerance,
1/5 W
R2
RMCF0402FT10K0
Stackpole
0402
Thick film resistor, 10 k
Ω
, 1 %
tolerance, 1/16 W
U1
UCC27517DBVT
Texas
Instruments
SOT-23-5
Low-side gate driver, 18 V, 4 A peak
Safe Torque Off (STO)
This circuit provides a dual, protected and isolated input interface for the Torque Off functionality built-in the
Everest CORE. Whenever any of the input signals carry a low level, the power stage of the Everest CORE will remain
unable to generate a rotating magnetic field inside the motor, which means it will be unable to generate torque.
The high level is up to 30 V tolerant.
Commutation requirements
Once a power resistor is properly selected, meaning that it fits the dynamics of the load during re-
injection, there is no need to modulate the excitation of Q1. Not only no PWM is required, but it would
even have a negative effect by increasing the power losses in the transistor with no need. Still, the
transistor will switch at a frequency within the scale of 10 Hz to 1 kHz, depending on the over-voltage
detection hysteresis configured in the Everest CORE.
