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FAN7888MX Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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FAN7888MX Datasheet(HTML) 11 Page - Fairchild Semiconductor |
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11 / 14 page  © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN7888 • Rev.1.0.0 11 Application Information 1. Protection Function 1.1 Under-Voltage Lockout (UVLO) The high- and low-side drivers include under-voltage lockout (UVLO) protection circuitry for each channel that monitors the supply voltage (VDD) and bootstrap capaci- tor voltage (VBS1,2,3) independently. It can be designed prevent malfunction when VDD and VBS1,2,3 are lower than the specified threshold voltage. The UVLO hystere- sis prevent chattering during power supply transitions. 1.2 Shoot-Through Prevention Function The FAN7888 has shoot-through prevention circuitry monitoring the high- and low-side control inputs. It can be designed to prevent outputs of high and low side from turning on at same time, as shown Figure 27 and 28. Figure 27. Waveforms for Shoot-Through Prevention Figure 28. Waveforms for Shoot-Through Prevention 2. Operational Notes The FAN7888 is a three half-bridge gate driver with internal typically 120ns dead-time for the three-phase Brushless DC (BLDC) motor drive system, as shown in Figure 1. Figure 29 shows a switching sequence of 120 ° electrical commutation for a three-phase BLDC motor drive system. The waveforms are idealized: they assumed that the generated back EMF waveforms are trapezoidal with flat tops of sufficient width to produce constant torque when the line currents are perfectly rectangular 120 ° electrical degrees with the switching sequence as shown in Figure 29. The operating waveforms of the wey-connection reveal that repeat every 60 electrical degrees, with each 60 ° segment being “commutated” to another phase, as shown in Figure 29. After DT HIN1,2,3/LIN1,2,3 LO1,2,3/HO1,2,3 HO1,2,3/LO1,2,3 After DT Shoot-Through Prevent LIN1,2,3/HIN1,2,3 FAN7888 Rev.00 After DT Shoot-Through Prevent HIN1,2,3/LIN1,2,3 LO1,2,3/HO1,2,3 HO1,2,3/LO1,2,3 LIN1,2,3/HIN1,2,3 FAN7888 Rev.00 |
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