AN1139 STMicroelectronics, AN1139 Datasheet - Page 28

• Manufacturer Part Number: AN1139
• Description: L6254 - L6268 - L6269 12V DISK DRIVE POWER COMBO IC
• Manufacturer: STMicroelectronics

AN1139 APPLICATION NOTE
Figure 12. Internal Signals Timing
The BEMF waveform is shown as a reference along with a dashed line to indicate the occurrence of a zero
crossing. A typical sequence starts when the outputs switch states. Referring to Figure #12, during Phase 1,
28/64
COMMUTATION
ZERO CROSS
OUTPUT A
OUTPUT B
OUTPUT C
DELAY
BEMF
MASK
60`
15`