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| 型号： | FAN7888MX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC GATE DRIVER HALF BRIDG 20SOIC |
| 标准包装： | 1 |
| 配置： | 3 相桥 |
| 输入类型： | 非反相 |
| 延迟时间： | 130ns |
| 电流 - 峰： | 350mA |
| 配置数： | 1 |
| 输出数： | 3 |
| 高端电压 - 最大（自引导启动）： | 200V |
| 电源电压： | 10 V ~ 20 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 标准包装 |
| 产品目录页面： | 1216 (CN2011-ZH PDF) |
| 其它名称： | FAN7888MXDKR |
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 (V DD ) and bootstrap capaci-
tor voltage (V BS1,2,3 ) independently. It can be designed
prevent malfunction when V DD and V BS1,2,3 are lower
than the specified threshold voltage. The UVLO hystere-
sis prevents 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.
HIN1,2,3/LIN1,2,3
LIN1,2,3/HIN1,2,3
Shoot-Through Prevent
HO1,2,3/LO1,2,3
After DT
LO1,2,3/HO1,2,3
After DT
FAN7888 Rev.00
Figure 27. Waveforms for Shoot-Through Prevention
HIN1,2,3/LIN1,2,3
LIN1,2,3/HIN1,2,3
Shoot-Through Prevent
HO1,2,3/LO1,2,3
After DT
LO1,2,3/HO1,2,3
FAN7888 Rev.00
Figure 28. Waveforms for Shoot-Through Prevention
? 2008 Fairchild Semiconductor Corporation
FAN7888 ? Rev.1.0.1
11
2. Operational Notes
The FAN7888 is a three half-bridge gate driver with
internal, typical 120 ns 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 wye-connection
reveal that repeat every 60 electrical degrees, with each
60 ? segment being “commutated” to another phase, as
shown in Figure 29.
www.fairchildsemi.com
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