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參數(shù)資料
| 型號： | LB1696 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 3-phase Brushless Motor Driver |
| 中文描述： | 三相無刷電機驅動器 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 71K |
| 代理商： | LB1696 |
7.
Current limiter
The current limiter turns off the sink side output transistor when the output current-set current value (limiter value) is reached. The
output current is limited by the limit value. The RF pin is used to detect the output current. The output current is detected as
voltage by connecting resistor R
f
between RF pin and GND. When the RF pin voltage reaches 0.5 V (typ), the current limiter
operates so that the output current is limited to the 0.5/R
f
-set limiter value.
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 LB1696 uses this output
switching method for the current limiter, the ASO problems when current limitation goes into operated mode as compared
with the output unsaturated current limited one. In addition, by separating current limiter operation into two modes, one when
the motor is locked and one when the motor is rotating (during start-up), it was possible to implement a current limiter circuit
with excellent motor start-up characteristics. The explanation of current limiter operation below is divided into two parts: one
for the mode used when the motor is locked and one for the mode used when the motor is rotating. The output off time
depends on the 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 R1 connected to the R1 pin and
resistor R2 connected to the R2 pin. In the LB1696, the charge current can be switched for when the motor is locked and for
when the motor is rotating in order to support motors for a large number of applications. As a result, it is possible to set the
output off time so that it is different for when the motor is locked and for when the motor is rotating. By setting the output
off time so that it is shorter when the motor is rotating (at start-up) as opposed to when the motor is locked, it is possible to
reduce the decrease in torque at start-up caused by the output off time. The charge currents and output off times for when the
motor is locked and for when the motor is rotating are as follows:
(1) Charge current I
CL1
and output off time t
off1
when the motor is locked
I
CL1
6
1.4/R1
t
off1
6
C/I
CL1
×
2.0
6
1.42
×
R1
×
C
(R1 must be set between 14 k
and 100 k
.)
(2) Charge current I
CL2
and output off time t
off2
when the motor is rotating
I
CL2
6
I
CL1
+ (1.4/R2)
t
off2
6
C/I
CL2
×
2.0
6
1.42
×
R
×
C {R = R1
×
R2/(R1 + R2)}
(R2 must be set between 7 k
and 100 k
.)
LB1696
No.5244-7/9
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LB1696-E | 功能描述:馬達/運動/點火控制器和驅動器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB16CGG01 | 功能描述:按鈕開關 SPDT ON-ON GRAY ROUND BODY ONLY RoHS:否 制造商:C&K Components 觸點形式:2 NC - 2 NO 開關功能:ON ? OFF 電流額定值:4 A 電壓額定值 AC:12 V to 250 V 電壓額定值 DC:12 V to 50 V 功率額定值: 安裝風格:Through Hole 照明:Illuminated 照明顏色:None IP 等級:IP 40 端接類型:Solder 觸點電鍍:Silver 執(zhí)行器:Square 蓋顏色: 封裝: 可燃性等級:UL 94 V-0 |
| LB16CGG01-05-BJ | 制造商:NKK 制造商全稱:Nihon Kaiheiki Industry Co. Ltd. 功能描述:Standard Size Pushbuttons |
| LB16CGG01-12-BJ | 制造商:NKK 制造商全稱:Nihon Kaiheiki Industry Co. Ltd. 功能描述:Standard Size Pushbuttons |
| LB16CGG01-12-JG | 制造商:NKK Switches 功能描述:STD SIZE PUSHBUTTON/ILLUMINATED/ 制造商:NKK Switches 功能描述:STD SIZE PUSHBUTTON/ILLUMINATED/SNAP-IN |
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