Boom Electronics Board (BEB) Engineering Peer Review Oct Boom Electronics Board (BEB) Engineering Peer Review Oct. 15, 2003 Stewart Harris, Hilary Richard

Functional Requirements BEB Requirements Functional Requirements Spin Plane Booms, for each provide: Floating Ground Driver “Bias”, “Stub”, “Usher” programmable potentials “Braid” programmable, switchable potential AC test signal source Axial Booms, for each provide:

BEB Requirements, con’t.

BEB Analog Electronics

Bias Driver Heritage Design CLUSTER, POLAR, FAST Minor changes in parts selection and DAC

BEB Block Diagram

Braid Bias

Preliminary PCB Layout

BEB PCB Assembly

Completed BEB Breadboard BEB Design Status Completed BEB Breadboard Verified parts selection Full characterized w.r.t. DC gain and AC response Available for testing with Preamp prototypes Engineering Model BEB schematic completed PC board layout in progress Actel design specification in progress

Spin Plane Boom Motor Driver BMD Requirements Brushless DC Motor driver Sense rotor position with Hall Effect devices Drive stator coils based on commutation logic Supply voltage: 28 ± 6 Volts Load current: ~300mA Higher radiation environment than IDPU (100krad) Short term exposure (6 months)

BMD Block Diagram Motor Driver Board Brushless Gearmotor

Additional slides included: BEB / BMD Add’l Info Additional slides included: Floating ground driver schematic Boom Motor Driver breadboard schematic

Floating Ground Driver Heritage Design CLUSTER, POLAR, FAST Minor changes in part selection

BMD Breadboard Schematic