ElmoMC SimplIQ Analog Servo Amplifiers-Ocarina Installation - Manual (Page 13)

3.5 Integrating the Ocarina and Castanet on a PCB
The Ocarina and Castanet are designed to be mounted on a PCB, either by soldering its
pins directly to the PCB or by using suitable socket connectors. In both cases the following
rules apply:
3.5.1 Traces
1. The size of the traces on the PCB (thickness and width) is determined by the
current carrying capacity required by the application.
ƒ The rated continuous current limit (Ic)of the Ocarina and
Castanet is the current used for sizing the motor traces
(M1, M2, M3 and PE) and power traces (VP+, PR and PE).
ƒ For control, feedbacks and inputs/outputs conductors the
actual current is very small but “generous” thickness and
width of the conductors will contribute to a better
performance and lower interferences.
2. The traces should be as short as possible to minimize EMI and to minimize
the heat generated by the conductors.
3. The spacing between the high voltage conductors (VP+, PR, M1, M2, M3, VL)
must be at least:
ƒ Surface layer: 1.5 mm
ƒ Internal layer: 0.10 mm
Complying with the rules above will help satisfy UL safety standards, MIL-STD-275 and
the IPC-D-275 standard for non-coated conductors, operating at voltages lower than 100
VDC and at “unlimited altitudes” (above 10,000 meters – 30,000 feet).
3.5.2 Grounds and Returns
The “Returns” of the Ocarina and Castanet are structured internally in a star configuration.
The returns in each functional block are listed below:
Functional Block Return Pin
Power PR (Power Return)
Internal Switch Mode P.S. PR (Power Return)
Control section Internal, not accessible
Feedback SUPRET (J2/2)
The returns above are all shorted within the Ocarina and Castanet in a topology that
results in optimum performance.
1. When wiring the traces of the above functions, on the Integration Board, the
returns of each function must be wired separately to its designated terminal on
the Ocarina and Castanet. DO NOT USE A COMMON GROUND PLANE.
Shorting the commons on the Integration Board may cause performance
degradation (ground loops, etc).
2. Return Traces: The return traces should be as large as possible, but without
shorting each other, and with minimal cross-overs.
Ocarina/Castanet Installation Guide Installation
MAN-OCSIG (Ver. 1.4)
3-4