參數(shù)資料
型號(hào)： LB11691H
廠(chǎng)商： Sanyo Electric Co.,Ltd.
英文描述： Monolithic digital IC Pre-Driver IC for Brushless Motor Drive in Electric Bicycles
中文描述： 單片數(shù)字集成電路預(yù)驅(qū)動(dòng)器的無(wú)刷電機(jī)驅(qū)動(dòng)集成電路在電動(dòng)自行車(chē)
文件頁(yè)數(shù)： 14/21頁(yè)
文件大?。?/td> 214K
代理商： LB11691H
LB11691H
No.8314-14/21
7. Low-voltage protective circuit
The low-voltage protective circuit performs detection using the voltage applied to the LVS pin and turns OFF all drive
outputs when the voltage drops below the operating voltage (3.85Vtyp). The circuit has hysteresis to prevent repetition
of ON/OFF near the protected operating voltage. The output is not recovered when the voltage does not rise by about
0.5V above the operating voltage. In the protection operation, the RES pin voltage
becomes “L” too.
The protection operating voltage is based on the 5V system detection level. To raise the
detection level, connect Zener diode in series to the LVS pin and shift the detection
level (detection voltage = 3.85Vtyp+Vz). The LVS pin inrush current at detection is
about 62
μ
A. If it is necessary to stabilize rise of the Zener diode voltage and to suppress
fluctuation of the Zener voltage, insert a resistor between LVS pin and GND to increase
the diode current. The detection voltage may also be raised, without using Zener diode,
by resistive potential division. When connection as shown in the right is made ;
Detection voltage
≈
((3.85 ÷ R2) + 62
μ
A) × (R1+R2)
Cancellation voltage
≈
((4.35 ÷ R2) + 70
μ
A) × (R1+R2)
With R1 = 13k
Ω
and R2 = 2.2k
Ω
, the detection voltage becomes about 28V while the
cancellation voltage becomes about 32V. Pay due attention when raising R2 because
the error of detection voltage may increase because of temperature and variance.
When the protective circuit is not to be used, do not open the LVS pin (output OFF
when this is opened) and apply the voltage on an inoperative level.
8. RES circuit
Apply initial reset with the RES pin to ensure stable operation at power ON. Initial reset includes the following
operations :
All drive outputs OFF
EI+ pin voltage at “L”
FV pin voltage at “L”
Normally, connect a resistor and capacitor between RES and V5 pins and between
these pins and GND respectively and set the reset time. Use a 2.7k
Ω
or more
resistor. Set so that the time constant becomes R
×
C
≥
1m (0.1
μ
F or more if this is
10k
Ω
). If the charge of a capacitor connected to EI+ or FV pin must be completely
discharged, set the reset time by taking into account the discharge time of these
pins. It is also recommended to set the reset time longer than the time necessary for
stabilization of the VB voltage at power ON.
In addition to initial reset, reset may be applied when the control voltage is low as
shown in Fig. 1 in the right. In this case, all drive outputs can be turned OFF when
the control voltage becomes about 0.67V(1.27V - VBE). The reset cancellation
voltage is about 0.9V (0.67V+0.23V). If only the control voltage is 0% duty (1.2V
or less), the motor is braked when driven in the reverse direction. This is an
effective application when braking is not necessary during reverse drive. If the
control voltage cannot be decreased to 1V or less, application as shown in Fig. 3
may be used.
Heat detection with thermistor may also be considered to prevent thermal
breakdown of output FET. Connect as shown in Fig. 2 in the right and adjust the
external resistance, and the protective operation can be done. Fig. 4 shows a
combination of this application with thermistor and an application shown in Fig. 3.
To V5 pin
EI+pin
RES pin
Fig.1
Fig.2
To control voltage
To V5 pin
RES pin
Thermistor
LVS pin
R1
R2
To detectiom
power supply
To detectiom
power supply
LVS pin
VZ
RES
10k
Ω
47k
Ω
EI+
Control voltage (1V to 4V)
10k
Ω
47k
Ω
EI+
RES
Fig.4
Fig.3
Control voltage (1V to 4V)
To V5 pin
相關(guān)PDF資料
PDF描述
LB11691 Monolithic digital IC Pre-Driver IC for Brushless Motor Drive in Electric Bicycles
LB11692JH Monolithic Digital IC 24V Fan Motor Driver IC
LB11693H Monolithic Digital IC 3-Phase Brushless Motor Driver for 24V Fan Motors
LB11693JH Monolithic Digital IC 24V Fan Motor Driver IC
LB11696V Direct PWM Drive Brushless Motor Predriver IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LB11691H-TLM-E 制造商:Sony Semiconductor Solutions Division 功能描述:
LB11692JH 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:Monolithic Digital IC 24V Fan Motor Driver IC
LB11693 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:Three-Phase Brushless Motor Driver for 24 V Fan Motors
LB11693H 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:Monolithic Digital IC 3-Phase Brushless Motor Driver for 24V Fan Motors
LB11693H-MPB-E 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)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
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