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参数资料
| 型号： | LB11867FV |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.02 A, PDSO16 |
| 封装： | 0.225 INCH, SSOP-16 |
| 文件页数： | 7/8页 |
| 文件大小： | 214K |
| 代理商： | LB11867FV |
7-1. Output off time
The current limiter is so designed that current limit function turns on to turn off the sink side output transistor and then turn
on the transistor again after off period of a fixed time (output off time) has elapsed. Since the LB1694N uses this output
switching method for the current limiter, it is hardly necessary to consider ASO in current limiter operated mode as compared
with the output unsaturated current limited one. The output off time depends on charge time of capacitor C connected to the
C pin. When the current limiter turns on, C begins charging and the output is kept off until C is charged up to 2 V (typ).
When C has been charged up to 2 V, the sink side output turns on again. The C charging current is a constant-regulated
current which depends on resistor R connected to the R pin. The C charging current ICL and output off time toff are calculated
as follows:
ICL 6 1.3/R (R must be set to be 13 kΩ and 100 kΩ.)
toff 6 C/ICL × 2.0
6 1.53 × R × C
7-2. Output current neglect time
While the current limiter turns on and the sink side output is off, the regeneration current flows through the external diode
used for absorbing the regeneration current above the output that was turned off. After the output off time elapses and the
sink side output is turned on again, reverse current flows momentarily through the external diode (for the diode’s reverse
recovery time), causing the current that reaches the limiter value to flow momentarily through the output. Because this current
will cause current limiter to turn on again, turning off the output, the average current decreases, causing the torque to be
decreased at motor start-up, etc. Therefore, in order to prevent this current from being detected, the current limiter is designed
so that the output current is not detected for a fixed period of time after the sink side output is turned on again. This length
of time is the output current neglect time. The output current neglect time is determined by the discharge time of the
capacitor C connected to the C pin. When current limiter turns on and C charges to 2 V, C begins discharging, and the output
current neglect time is the time it takes for C to discharge to the point where the voltage at C is 0.4 V (typ). The C discharge
current is a constant current, and is set at about 3 times charge current ICL, As a result, the output current neglect time is
about 1/3 of the output off time. The C discharge current ICH and the output current neglect time tsm are determined
according to the following equations:
ICL 6 1.3/R × 3
tsm 6 C/ICL × 1.6
6 0.41 × R × C
Because there is a slope to the time at which the sink side output is turned on again, the reverse current is not very large,
even if a rectifier diode (a diode in which the reverse recovery time is not short) is used as the external diode for absorbing
the regeneration current in the current limiter.
7-3. Output off time setting
It is necessary to set the output off time to a suitable level for the type of motor being used. (The output off time is set by
the external resistors connected to the R pin, and by the external capacitor connected to the C pin.) Fig. 1 shows the current
limiter operation waveform.
(1) When the output off time is set short
The output current neglect time is set by a circuit within the IC to about 1/3 of the output off time. Therefore, if the
output off time is set to a very short length of time, the output current neglect time may not be adequate. If the output
current neglect time is inadequate, the current limiter will turn on in response to reverse current from the external diode
used to absorb the regeneration current. (Refer to Section 7-2.) Furthermore, if the output off time is short, the diode
reverse current becomes large and ASO must be considered.
LB1694N
No.5243-7/8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB11867FV_11 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:For Fan Motor Variable Speed Single-phase Full-wave Pre-driver |
| LB11867FVL-MPB-E | 制造商:ON Semiconductor 功能描述:SINGLE PHASE MOTOR DRIVER - Ammo Pack |
| LB11867FVL-TLM-E | 制造商:ON Semiconductor 功能描述:SINGLE PHASE MOTOR DRIVER - Tape and Reel |
| LB11867FV-MPB-E | 功能描述:马达/运动/点火控制器和驱动器 RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| LB11867FV-MPB-H | 功能描述:马达/运动/点火控制器和驱动器 RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
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