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參數(shù)資料
| 型號： | LB1695M |
| 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)： | 5/7頁 |
| 文件大?。?/td> | 89K |
| 代理商： | LB1695M |
LB1695M Functional Description
1. Hall input circuit
The Hall input circuit is a differential amplifier with a hysteresis of 30 mV (typical). The operating DC level must fall
within the common-mode input voltage range (1.5 V to V
CC
- 1.8 V). We recommend providing inputs with a swing
of at least three times the hysteresis, i.e. 120 to 160 mV p-p, to prevent noise from interfering with circuit operation.
Insert capacitors in the Hall amplifier IN
+
and IN
–
inputs if capacity is found to be problematic during noise
evaluation.
2. Protection circuits
Low voltage protection circuit
If the V
CC
voltage falls below a stipulated level (VLVSD), the sink side output transistor is turned off. This circuit
prevents incorrect operation at low V
CC
voltages.
Thermal protection circuit
If the junction temperature exceeds a stipulated temperature (TSD), the sink side output transistor is turned off. This
circuit protects the IC from thermal damage. Applications must be designed so that this circuit only operates in
abnormal conditions.
3. FG output circuit
This circuit outputs signals that are synthesized from the IN1, IN2, and IN3 Hall amplifier input signals and to which
wave shaping has been applied. FG1 has the same frequency as the Hall inputs, and FG2 has a frequency three times
that of the Hall inputs.
4. Forward/reverse control circuit
This IC is designed assuming that applications will not perform motor forward/reverse (F/R) control operations while
the motor is turning. Through currents will flow in the output if the motor direction is switched while the motor is
turning and ASO will become a problem. We recommend performing F/R control operations with the VM power
supply in the off state, i.e. when the motor is stopped.
5. V
CC
and V
M
power supplies
If the power supply slew rate at power on is excessive, through currents will flow in the output and ASO will become
a problem. The power supply slew rates must not exceed
V
CC
/
t = 0.04 V/μs and
VM/
t = 0.16 V/μs. Also, at
power on it is desirable to bring up the V
CC
voltage first, and then bring up the V
M
voltage. At power off, it is
desirable to bring down V
M
first, and then bring down V
CC
only after the motor has stopped. If V
CC
is turned off
after V
M
but while the motor is still turning due to inertia, the V
M
voltage may rise beyond the voltage handling
capacity of the IC.
6. Power supply stabilization capacitors
If large fluctuation occur in the V
CC
line, the low-voltage protection circuit may operate incorrectly. Capacitors (with
values of a few μF) must be inserted in the V
CC
line (between V
CC
and ground) to stabilize the power supply. Since
large switching current flow in the V
M
line, fluctuations in the IC V
M
voltage may occur due to inductances in the
wiring pattern. Capacitors must be inserted in the V
M
line (between V
M
and ground) so that incorrect operation and
voltages in excess of the IC voltage handling capacity do not occur. In particular, if the application wiring lines (V
M
,
V
CC
, and ground) are long, capacitors adequate to stabilize the power supply lines must be used.
7. Current limiter circuit
When the output current reaches the current set as the output current (the limit value), the current limiter circuit turns
off the sink side output transistor to limit the output current to the limit value. The RF pin is used to detect the output
current. In particular, the output current is detected as a voltage using the Rf resistor, which is inserted between the
RF pin and ground. The current limiter operates when the Rf pin reaches 0.5 V (typical) and thus the output current is
limited to a value of 0.5/Rf.
Output off time
After the current limiter circuit operates and limits the current by turning off the sink side output transistor, it provides
a fixed off period (referred to as the output off time), after which it turns the transistor back on. As opposed to current
limiter techniques that operated the output in an unsaturated state, the use of an output switching system of this type for
the current limiter has the advantage that ASO during current limiter operation is less likely to be a problem. The
output off time is determined by the charging time of the capacitor connected to the C pin. When the current limiter
operates, the circuit starts to charge the C pin capacitor, and the output off time is the time required to charge the
capacitor to a voltage of 2 V (typical). When the capacitor voltage reaches 2 V, the sink side output is turned on again.
The capacitor charge current is a fixed current determined by the resistor R connected to the R pin. The C charge
No. 5802-5/7
LB1695M
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB1696 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:3-phase Brushless Motor Driver |
| LB1696-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 |
| LB16CGG01 | 功能描述:按鈕開關(guān) 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(guān)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(fēng)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 |
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