Elmo MAN-OCSIG (Ver. 1.2) 3.5 Integrating the Ocarina and Castanet on a PCB

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:

1. The size of the traces on the PCB (thickness and width) is determined by the current

carrying capacity required by the application.

 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).

 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:

 Surface layer: 1.5 mm

 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).

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.

3. Main Power Supply and Motor Traces: The power traces must be kept as far away as

possible from the feedback and control traces.

Ocarina/Castanet Installation Guide Installation

MAN-OCSIG (Ver. 1.2)

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