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參數(shù)資料
| 型號： | LB1921 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Three-Phase Brushless Motor Driver for OA Applications |
| 中文描述： | 三相無刷電機驅(qū)動的辦公自動化應用 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大小： | 138K |
| 代理商： | LB1921 |
12. External Resistors
R4 and R5
The resistors R4 and R5 exist to apply a high-level input to the F/R pin. Since the F/R input has a pull-down
resistor of about 50 k
, it is at the low level when open. Apply a voltage of over 4.0 V and under 6.3 V to input a
high level.
R15
The resistor R15 exists to apply a high-level input to the S/S pin. Since the S/S input has a pull-down resistor of
about 50 k
, it is at the low level when open. Apply a voltage of over 4.0 V and under 6.3 V for the start state high
level input. Although dividing the voltage with two resistors, as is done with the F/R input, would improve the
resistance to noise since a lower input impedance can be set up, when noise is not a problem the high level can be
set by connecting a single resistor such as R15. A value of 180 k
is recommended.
If V
CC
rises slowly (less than about 10 V/ms) when power is first applied, the motor may rotate somewhat (in stop
mode). This is because the S/S pin input voltage is resistor divided and the input voltage will be under 2.6 V (the
start input level) when V
CC
is under 12 V. If the rise rate cannot be increased and this phenomenon is a problem, it
can be resolved by connecting a capacitor between V
CC
and the S/S pin.
13. Through Currents due to the Direct PWM Scheme
In the direct PWM scheme, through currents flow in the outputs due to transistor switching in applications
implemented with either discrete components or the LB1822. This is due to output transistor delays and parasitic
capacitances. Previously, when this was a problem, additional capacitors were used to resolve the problem. However,
since the LB1921 resolves this problem at the circuit level, no additional external components are required. During
switching, whiskers of less than about 10 ns may be observed on the RF voltage waveform, but these are not a
problem.
14. Oscillator Element
Normally, a crystal oscillator is used with this IC. If the speed control characteristic requirements are not stringent, a
ceramic oscillator could be used. To avoid problems, consult the manufacturer of the oscillator element when
selecting the oscillator element and determining the values of the external resistors and capacitors.
15. Sample IC Internal Power Dissipation Calculation (calculated for V
CC
= 24 V and typical rated values)
Power dissipation due to current drain (I
CC
)
Start mode:
P1 = V
CC
×
I
CC
1 = 24
×
34 m = 0.82 W
Stop mode:
P2 = V
CC
×
I
CC
2 = 24
×
8 m = 0.19 W
Power dissipation when –10 mA is drawn from the 7-V fixed voltage power supply
P3 = (V
CC
– 7)
×
10 m = 17
×
10 m = 0.17 W
Power dissipation due to output drive current (when the output on duty is 100%)
P4 = {(V
CC
– 1)
2
/8 k} + {(V
CC
– 2)
2
/10 k}
= (232/8 k) + (222/10 k) = 0.12 W
Power dissipation in the output drive transistors (when I
O
= 2 A and the output on duty is 100%)
P5 = V
O sat
2
×
I
O
= 2.7
×
2 = 5.4 W
Therefore, the total power dissipation for the whole IC is:
In stop mode:
P = P2 = 0.19 W
In start mode:
P = P1 + P3 + P4 + P5 = 6.51 W
(For a output on duty of 100%)
16. IC Temperature Rise Measurement Techniques
Thermocouple measurement
Attach the thermocouple to a fin on the heat sink when using a thermocouple to measure the IC temperature. This
technique is simple but is subject to large measurement errors when the heat generation is not consistent.
Measurement using IC internal diode characteristics
We recommend using the parasitic diode that exists between the INT.IN and ground in this IC. (According to
Sanyo data, the temperature characteristic of this diode is about 1.8 V/°C for ID = 1 mA.) The external resistor
must be removed during testing.
No. 5439-9/10
LB1921
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|---|---|
| LB1922 | Three-Phase Brushless Motor Driver for Office Automation Applications |
| LB1923M | Power Brushless Motor Pre-Driver IC for OA Equipment |
| LB1924 | Power Brushless Motor Driver IC for Office Automation Equipment |
| LB1929 | Three-Phase Brushless Motor Driver for OA Products |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LB1922 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Three-Phase Brushless Motor Driver for Office Automation Applications |
| LB1923M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Power Brushless Motor Pre-Driver IC for OA Equipment |
| LB1923M-MPB-E | 制造商:ON Semiconductor 功能描述:3PHASE MOTOR PRE-DRIVER - Trays |
| LB1923M-TLM-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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB1924 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Power Brushless Motor Driver IC for Office Automation Equipment |
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