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LB11948T
No.7947-12/13
(2) Constant current settings
The reference voltages of the VREF1 and VREF2 pins can be set by dividing the resistance voltage from the 1V
regulator output pin (1VREG).
The output current is set using the VREF reference voltage applied to the VREF1 and VREF2 pins and the Re resistor
connected between the E1 and E2 pins and ground. The bias current of the output transistor also flows from the E pins
so that the Iout output current flowing to the motor is reduced by an amount equivalent to the bias current. In addition,
in controlling the constant current, the voltage is sensed by the E pins (pad area on IC chip) so that the amount
equivalent to the wire bonding resistance (rw) from the pad to the package pins is added to the current sensing
resistance (Re).
Therefore, the formula for calculating the current setting is as shown below. (Refer to Fig. 2)
IOUT = VREF / (Re + rw) - Ibias
[A]
Re : Sensing resistance of resistor connected between E pins and ground
rw : Amount equivalent to wire bonding resistance from pad to pins
rw = 50 - 100m
Ω
Ibias : Output transistor bias current
The Ibias current corresponds to the current setting reactive current (IE) in the specifications for the electrical
characteristics.
Current setting reactive current IE ratings : Min : -22mA Typ : -17mA
Max : -10.5mA
Fig. 2
(3) VREF pins
The VREF pins are the reference voltage input pins for the preset current, so take special care to ensure that they are
not affected by noise. If these pins will be affected by noise, connect a capacitor to VREF1 and VREF2 pins.
(4) Notes on the Ground Pins
Since this IC switches large currents, the following notes on ground lines must be observed.
The PCB pattern lines in areas that handle large currents must be as wide as possible so as to have low impedances,
and must be kept as far as possible from the small signal systems.
The ground terminals on the sensing resistors Re connected to the E pins (E1 and E2) must be connected as close as
possible to the IC GND (pin 21), PGND (pin 22), or DGND (pins 5 and 26) pins as possible.
The capacitors between VCC and ground and between VBB and ground must be as close as possible to the
corresponding VCC and VBB pin in the pattern.
VREF
Re
IC E1 pin
IC VREF1 pin
IO
Ibias
Sense current : Ie = IO+Ibias
Wire (rw)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB11948T_07 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver |
| LB11948T_10 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver |
| LB11948T-MPB-E | 功能描述:馬達/運動/點火控制器和驅(qū)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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB11948T-TLM-E | 功能描述:馬達/運動/點火控制器和驅(qū)動器 PRINTER 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB-1195 | 制造商:Ideal Industries Inc 功能描述:WIRESTOP STMLT STD 制造商:Ideal Industries Inc 功能描述:Stripmaster Lite Repair |
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