18V25A Electric Drill Controller Using OB6627L

OB6627L_1943_Protel

OB_DOC_DBM_A_6627L00

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Contents Index

1. System Electrical Specification......................................................................................................... 3

1.1 Input Characteristic ............................................................................................................... 3

1.2 System parameters ............................................................................................................... 3

1.3 Output characteristic ................................................................................................ ............. 3

1.4 Environmental....................................................................................................................... 3

2. Board Information ................................ ................................................................ ............................ 4

2.1 Schematic............................................................................................................................. 4

2.2 Bill of material ................................ ................................................................ ....................... 5

2.3 PCB Garber File ................................................................................................................... 7

2.4 Heat-sink Drawing ................................ ................................................................................ 8

2.5 Connector Function Description ............................................................................................ 9

2.6 BLDC Controller Board Snapshot .........................................................................................10

3. Performance Evaluation.................................................................................................................. 11

3.1 Voltage Test .........................................................................................................................12

3.1.1 Gate Driver & MCU Supply Power ON/OFF ................................ ..............................12

3.1.2 OB6627L Under Voltage Lockout ON/OFF ................................................................12

3.1.3 Battery Under Voltage Lockout ..................................................................................13

3.2 MOSFET ................................ ................................................................ .............................13

3.2.1 Vgs Voltage = 12V @ BUS = 18V .............................................................................13

3.2.2 Vgs Rise/Fall Edge Time ...........................................................................................13

3.2.3 Vds Strike Voltage @ Bus = 21V ...............................................................................15

3.3 Current Sensing ................................................................................................ ...................15

3.4 Motor Control .......................................................................................................................16

3.4.1 Motor Run .................................................................................................................16

3.4.2 Motor Brake ..............................................................................................................16

3.4.3 Motor Low Speed and Torque Maintain .....................................................................17

3.5 Temperature Test .................................................................................................................17

3.5.1 Temperature Measure ............................................................................................... 17

3.5.2 MOSFET Temperature Protection .............................................................................17

3.6 Reliability ................................ ................................................................ .............................18

3.6.1 Low Temperature Reliability ......................................................................................18

3.6.2 High Temperature Reliability .....................................................................................18