5 integrating the ocarina and castanet on a pcb, 1 traces, 2 grounds and returns – ElmoMC SimplIQ Analog Servo Amplifiers-Ocarina Installation User Manual

Page 13

Advertising
background image

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

Advertising
This manual is related to the following products: