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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(dá)驅(qū)動器 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 89K |
| 代理商： | LB1695M |
current I
CL
and the output off time t
OFF
are related as follows:
I
CL
≈
1.3/R (R must have a value in the range 13 k
to 100 k
)
t
Off
≈
C/I
CL
×
2.0
≈
1.53
×
R
×
C
Output current ignored time
A regenerative current flows in the external diode provided to absorb regenerative currents in the upper side of the
output that was turned off while the sink side of that output is turned off by the operation of the current limiter. When
the output off time has elapsed and the sink side output has been turned on again a reverse current flows
instantaneously in this diode, due to the reverse recovery period of the diode. This results in a current that may reach
the current limit value instantaneously. If this current were to cause the current limiter circuit to operate again, the
average current produced by the IC would be reduced, and the torque produced during motor drive could be reduced.
Therefore, to assure that this current is not detected, the current limiter circuit provides a period (referred to as the
output current ignored time) during which the output current is not detected for a fixed period after the sink side output
is turned on again after being turned off. The output current ignored time is determined by the discharge time of the
capacitor C connected to the C pin. Discharge starts at the point the capacitor has been charged to 2 V after the current
limiter circuit operates, and the output current ignored time is the time until the capacitor is discharged to 0.4 V
(typical). The capacitor discharge current is a fixed current set to be about three times the charge current I
CL
.
Accordingly, the output current ignored time is about 1/3 the output off time. The C discharge current I
CH
and the
output current ignored time tsm are related as follows:
I
CH
≈
1.3/R
×
3
t
sm
≈
C/I
CH
×
1.6
≈
0.41
×
R
×
C
Since the current limiter circuit provides a slope in the on time at the point when the sink side output is turned back on,
reverse currents will not increase significantly, even if a rectifying diode (that is, a diode whose reverse recovery time
is relatively long) is used as the regenerative current absorbing diode.
Output off time setting
Applications must set up the output off time to be optimal for the type of motor used. (This time is set by the external
resistor connected to the R pin and the external capacitor connected to the C pin.) Figure 1 shows the waveforms during
current limiter operation.
— If the output off time is too short:
Since the ratio between the output off time and the output current ignored time is fixed at about 3:1 by IC internal
circuits, it is not possible to set these parameters independently. This means that if a relatively short output off time
is used, the output current ignored time may be insufficient. If the output current ignored time is insufficient, the
current limiter circuit may operate due to the reverse current in the regenerative current absorption diode. (See
section 7 above.) Also, if the output off time is too short, the reverse current may increase leading to ASO
problems.
— If the output off time is too long:
Setting up a relatively long output off time can reduce the average current produced by the IC, which can result in
reduced motor torque. For certain motor types, this may make it impossible to switch from the current limiter
operating state to steady state operation at motor startup.
No. 5802-6/7
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(dá)/運(yùn)動/點(diǎn)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(diǎn)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(diǎn)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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