USER GUIDE UG:017 Analog Control 3623 and 4623 ChiP DCMs Evaluation Board Arthur Russell VI Chip Applications Engineering October 2014 Contents Page Introduction Introduction 1 The Analog Control 3623 and 4623 ChiP DCM evaluation boards described in this document are designed to be used with the DCM family of isolated, DC-DC converters. The 3623 DCM board is used Contents 3 for the analog control, low input voltage 3623 ChiP products, while the 4623 DCM board is used for Features 3 the analog control, high input voltage (ofifl ne) 4623 ChiP products. Board Description 4 The DCM evaluation board can be configured for various enabling and fault monitoring schemes, as well as to exercise various modes of trimming, depending on the application requirements. The General Components 4 evaluation board can be used to evaluate DCMs in either a stand-alone configuration, or as an Test Points Description 6 array of modules. Schematic, Assembly Drawing and Bill of Materials 7 Enable options: Recommended Test 1. On-board mechanical switch (default) Equipment 14 2. External control Basic Connections 14 Board Operation Details 14 Trim options: Trim Control 15 1. Fixed trim operation (default): the TR pin is permitted to float at initial startup. Fault Monitoring 15 The DCM disables output trimming and the output trim is programmed to the nominal rated V . OUT Chassis Ground 16 2. Variable trim operation, on-board variable resistor: The trim pin voltage is ratiometric, with a rheostat working against a pull-up resistor inside the DCM to VCC. Paralleling 16 3. Variable trim operation, off-board control: The trim pin voltage is controlled via external programming control, which is referenced to the IN of each specific DCM in the system. Fault monitor options: 1. On-board LED: the FT pin drives a visible LED for visual feedback on fault status. 2. On-board optocoupler: the FT pin drives an on-board optocoupler to bring fault status across the primary-secondary isolation boundary. UG:017 vicorpower.com Applications Engineering: 800 927.9474 Page 1 IMPORTANT NOTICE: Hazardous voltages are present on the DCM Evaluation Board under power. PERSONAL CONTACT WITH LINE VOLTAGE MAY RESULT IN SEVERE INJURY, DISABILITY, OR DEATH. IMPROPER OR UNSAFE HANDLING OF THIS BOARD MAY RESULT IN SERIOUS INJURY OR DEATH. Read the precautions below entirely BEFORE using the DCM Evaluation Board. Do not operate the evaluation board unless you have the appropriate safety precautions in place on your bench to guarantee safety. The list below is not comprehensive and is not a substitute for common sense and good practice. nnDuring operation, the power devices and surrounding structures can be operated safely at high temperatures. nnRemove power and use caution when connecting and disconnecting test probes and interface lines to avoid inadvertent short circuits and contact with hot surfaces. nnNever use a jumper in place of the fuse. nnWhen testing electronic products always use approved safety glasses. Follow good laboratory practice and procedures. nnAvoid creating ground loops when making measurements of the isolated input or output voltage. nnCare should be taken to protect the user from accidental contact when under power. nnCare should be taken to avoid reversing polarities if connecting to the opposite (solder) side of the board. nnThe product evaluation boards described in this document are designed for general laboratory evaluation, and are not suitable for installation in end user equipment. nnRefer to the specific DCM module data sheet for electrical, thermal, and mechanical product details UG:017 vicorpower.com Applications Engineering: 800 927.9474 Page 2