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参数资料
| 型号： | BD6718FV-E2 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.02 A, PDSO20 |
| 封装： | ROHS COMPLIANT, SSOP-20 |
| 文件页数： | 17/34页 |
| 文件大小： | 1916K |
| 代理商： | BD6718FV-E2 |
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24/40
R2
R1
R2
+
2) Current limit (current limiting circuit)
The current limit circuit turns off the output, when the current that flows to the motor coil is detected exceeding a set
value.
The current value that current limit operates is determined by
a) Voltage of CL terminal and voltage of RNF terminal (BD6709FS, BD6718FV)
b) Internal setting voltage and voltage of RNF terminal (BD6721FS, BD6722FS)
a) Setting according to voltage of CL terminal and RNF terminal.
For example about BD6718FV, in Fig.82
When R1=40kΩ、R2=10kΩ、R4=0.5Ω, the amperage I that current limit operates is
V1 =
×
VREF =
×
2.5 = 0.5V
I =
=
= 1A
Current limit circuit operates at 1A.
Short CL terminal to VREF, short CS and RNF terminal to GND when the current limit function is not used.
b) Setting according to internal voltage and RNF terminal.
For example about BD6722FS, in Fig.83
When R4=0.33Ω, the current limit setting voltage is 350mV(typ.)
I =
=1.06A
Current limit circuit operates at 1.06A.
Short CS and RNF terminal to GND when the current limit function is not used.
Both of a) and b)
R3 and C1 are low-pass filters for RNF smooth voltage. Adjust for a current limit not to malfunction in proportion to the
PWM frequency.
Connect the capacitor with the COSC terminal to do the resume operation after a current limit operates at the PWM
operation by the pulse input.
+
-
CL
CS
VREF
R1
R2
C1
R4
R3
RNF
V1
Fig.82 External setting of current limit voltage
+
-
CS
Reference voltage
C1
R4
R3
RNF
Fig.83 Internal setting of current limit voltage
10k
40k
10k
+
R4
V1
0.5
0.33Ω
350mV
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相关代理商/技术参数 |
参数描述 |
|---|---|
| BD6721FS | 制造商:ROHM 制造商全称:Rohm 功能描述:Single-Phase Full-Wave Motor Driver for Fan Motor |
| BD6721FS_1 | 制造商:ROHM 制造商全称:Rohm 功能描述:Single-Phase Full-Wave Motor Driver for Fan Motor |
| BD6721FS-E2 | 功能描述:IC MOTOR DRIVER SGL PHASE SSOP16 RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 产品变化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 标准包装:1 系列:- 应用:DC 电机控制器，无刷（BLDC），3 相 评估套件:可供 输出数:1 电流 - 输出:100mA 电压 - 负载:5.25 V ~ 20 V 电源电压:5.25 V ~ 20 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-VQFN（7x7） 包装:剪切带 (CT) 其它名称:ATA6833-PLQWCT |
| BD6722FS | 制造商:ROHM 制造商全称:Rohm 功能描述:Single-Phase Full-Wave Motor Driver for Fan Motor |
| BD6722FS_1 | 制造商:ROHM 制造商全称:Rohm 功能描述:Single-Phase Full-Wave Motor Driver for Fan Motor |
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