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參數(shù)資料
| 型號： | LB1976 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | DC Fan Motor Driver |
| 中文描述： | 直流風(fēng)扇馬達驅(qū)動器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 91K |
| 代理商： | LB1976 |
Hall Input Circuit
The Hall input circuit is a differential amplifier with a hysteresis of 32 mV (typ.). The operation DC level must be within
the common-mode input voltage range (1.5 V to V
CC
– 1.5 V). To prevent noise and other adverse influences, the input
level should be at least 3 times the hysteresis (120 to 160 mVp-p). If noise at the Hall input is a problem, a noise-
canceling capacitor (about 0.01 μF) should be connected across the Hall input IN
+
and IN
–
pins.
FG Output Circuit
The Hall input signal at IN1, IN2, and IN3 is combined and subject to waveform shaping before being output. The signal
at FG1 has the same frequency as the FG1 Hall input, and the signal at FG2 has a frequency that is three times higher.
Start/Stop Control Circuit
The start/stop control circuit turns the source-side output transistors OFF (motor stop) when a High signal is input at the
S/S pin or when the pin is Open. When a Low signal is input at the S/S pin, the source-side output transistors are turned
ON, and the normal operation state is established (motor start).
Forward/Reverse Switching
This IC is designed under the assumption that forward/reverse switching is not carried out while the motor is running. If
switching is carried out while the motor is running, reverse torque braking occurs, leading to a high current flow. If the
current limiter is triggered, the source-side output transistors are switched off, and the sink-side output transistors go into
the short brake condition. However, because the current limiter of this IC cannot control the current flowing in the sink-
side output transistors, these may be destroyed by the short brake current. Therefore F/R switching while the motor is
running is permissible only if the output current (I
O
) is limited to a maximum of 2.5 A using the motor coil resistance or
other suitable means.
F/R switching should be carried out only while a High signal is input to the S/S pin or the pin is Open (stop condition), or
while the V
CTL
pin conforms to the following condition: V
CTL
≤
V
CTL
1 (duty cycle 0%). In any other condition, F/R
switching will result in feedthrough current. The F/R pin should therefore be fixed to Low (forward) or High or Open
(reverse) during use.
V
CC
, V
M
Power Supplies
When the power supply voltage (V
CC
, V
M
) rises very quickly when a power is first applied, a feedthrough current may
occur at the output. If the current remains below about 0.2 A to 0.3 A, it does not pose a problem, but such a possibility
should still be prevented by slowing down the voltage rise at power-on. Especially if the F/R pin is set to High or Open
(reverse), a quick rise in V
CC
is likely to cause feedthrough current. This should be prevented by ensuring that
V
CC
/
t
= 0.2 V/μs or less. Feedthrough current can also be prevented by first switching on V
CC
and then V
M
during power-on.
The sequence at power-down should be as follows. Provide a stop input to the S/S pin or a duty ratio 0% input to the
V
CTL
pin. When the motor has come to a full stop, switch off V
M
and then V
CC
. If power is switched off while the
motor is still rotating or a current is flowing in the motor coil (including motor restraint or inertia rotation), a
counterelectromotive current or kickback current may flow on the V
M
side, depending on the motor type and power-off
procedure. If this current cannot be absorbed by the V
M
power supply or a capacitor, V
M
voltage may rise and exceed
the absolute maximum V
M
rating for the IC. Ensure that this does not happen through proper design of the V
M
power
supply or through use of a capacitor.
Because the IC (LB1976) incorporates a shunt regulator, it can be used on a single power supply. In this case, supply
V
CC
(6.3 typ.) to the V
REG
pin via an external NPN transistor and resistor. When not using the regulator, leave the V
REG
pin open.
No. 6088-10/12
LB1976
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LB1978 | Three-Phase Half-Wave Sensorless Motor Driver for Headphone Stereos |
| LB1978V | Three-Phase Half-Wave Sensorless Motor Driver for Headphone Stereos |
| LB1980H | Three-Phase Brushless Motor Driver for VCR Capstan Motors |
| LB1980 | 3-Phase Brushless Motor Driver for VCR Capstan Motors |
| LB1981 | Three-Phase Brushless Motor Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB1976_08 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Fan Motor 3-phase Brushless Motor Driver |
| LB1976-E | 功能描述:馬達/運動/點火控制器和驅(qū)動器 FAN MOTOR 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 |
| LB1978 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Three-Phase Half-Wave Sensorless Motor Driver for Headphone Stereos |
| LB1978V | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Three-Phase Half-Wave Sensorless Motor Driver for Headphone Stereos |
| LB-198 | 制造商:Ideal Industries Inc 功能描述: 制造商:Ideal Industries Inc 功能描述:GRIPPER-SET C/STM .159/GRTPD |
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