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參數資料
| 型號： | LB1939T |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 0.4 A, PDSO20 |
| 封裝： | 1.10 MM HEIGHT, TSSOP-20 |
| 文件頁數： | 6/7頁 |
| 文件大小： | 111K |
| 代理商： | LB1939T |
Notes on Constant Current Control Settings
The LB1939T constant current control circuit has the
structure shown in the figure at the right. The voltage input
to the VC pin is resistor divided internally (by 70 k
and
20 k
resistors) to 1/4.5 and input to the plus (+) input of
the constant current control amplifier as reference.
The minus (–) input of this constant current control
amplifier is connected, through the wire bond resistor Rb
(= 0.1
), to the RFG pin. The constant current control
circuit operates by comparing the voltage generated by the
external current detection resistor connected to the RFG
pin and the reference voltage mentioned above.
Note that the voltage at VA will be that given by the
following formula since the bias current Ib (= 1.5 A)
flows from the constant current control amplifier plus (+)
input during constant current control operation.
VA = VC/4.5 + Ib
× 20 k
= VC/4.5 + 0.03
Therefore, the logical expression for setting the constant
current Iout is as follows.
Iout = VA/(RFB + Rb)
= (VC/4.5 + 0.03) / (RFB + Rb) ......(1)
No. 6194-6/7
LB1939T
Application Circuit Example 3
ENA1
ENA2
IN1
IN2
S-GND
SVDD
Vref
VC1
VC2 RFG1 RFG2
OUT1
OUT2
VDD
CPU
VS2
VS1
OUT3
OUT4
Channel 1 operates in constant voltage control mode: OUT outputs V
DD × 3K/(3K + 6K) × 1.95
Channel 2 operates in constant current control mode: The RFG voltage is controlled so that Vref/4.5 = 0.2 V.
* : FC1 is left open.
FC2
6 k
3 k
LB1939T
VS
RL
RFG
OUT1
OUT2
Rb = 0.1
RFB
Iout
VC
Constant current
control amplifier
Pad
VA
Ib = 1.5
A
70 k
20 k
A13864
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LB1939T_09 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:2 Channel H Bridge Constant Voltage/Constant Current Driver IC |
| LB1939T-MPB-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 |
| LB1939T-TLM-E | 功能描述:馬達/運動/點火控制器和驅動器 1.6-7.5V Stepping Motor Driver RoHS:否 制造商:STMicroelectronics 產品: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 |
| LB1940T | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:2-ch H-Bridge Constant Current Driver |
| LB1940T_06 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:2-ch H-Bridge Constant Current Driver |
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