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MMBD4148 Datasheet(PDF) 10 Page - Fairchild Semiconductor |
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MMBD4148 Datasheet(HTML) 10 Page - Fairchild Semiconductor |
10 / 28 page © 2012 Fairchild Semiconductor Corporation 10 FEBSPM3SPM45_M01MTCA • Rev. 1.0.1 3.3. Test Configuration #2 Use this configuration for motor currents greater than 7 ARMS. Modifications are required (see Figure 7). 1. Additional cooling and/or larger heat sink is required. 2. Variable transformer is recommended to slowly ramp VAC input to bulk capacitors. 3. Make a short connection in parallel with RT1, using RT2 mounting holes. 4. Attach a three-phase motor and MCU connections. 5. Connect the AC line voltage to J3 through a variable transformer to charge the bulk capacitors and operate the SMPS. The SMPS does not operate until the AC input voltage is greater than 90 VAC. 6. Slowly adjust the variable transformer for the desired AC voltage. 7. Fault indicator LED (D3) turns on when AC power is initially applied. 8. Press switch SW2 to reset the fault-detect circuit, turning off fault indicator D3. 9. Operate the MCU firmware to rotate the motor. More advanced control algorithms may require additional connections to the MCU (i.e.: phase current sensing, motor winding BEMF sensing, and bus voltage sensing). Variable Transformer + + R16 R15 R17 R14 JP2 JP1 C42 R59 R58 R57 R56 R54 R51 R50 R53 R52 R55 C41 C17 R23 C24 C29 R41 R40 C33 C25 R27 R26 C27 C28 R25 R46 R47 R60 R61 R62 R63 D3 D5 D6 D7 C1 C3 C5 ZD4 ZD2 C38 C15 ZD3 MCU Motor Figure 7. Test Configuration #2 D3 SW2 |
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