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參數(shù)資料
| 型號： | LB1922 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Three-Phase Brushless Motor Driver for Office Automation Applications |
| 中文描述： | 三相無刷電機的辦公自動化應用程序 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 123K |
| 代理商： | LB1922 |
12. External resistors
R4 and R5
R4 and R5 are used to apply the high-level input to the F/R pin. Since the F/R pin has a built-in pull-down resistor
which is about 50 k
, it will be at the low level when left open. A voltage of between 4.0 and 6.3 V must be
applied to input a high level to the F/R pin.
R15
R15 is used to apply the high-level input to the S/S pin. Since the S/S pin has a built-in pull-down resistor which is
about 50 k
, it will be at the low level when left open. (A voltage of between 4.0 and 6.3 V must be applied to
input a start-state high level to the S/S pin.) As is the case with the F/R input, using a two-resistor voltage divider
to apply a voltage to the S/S pin provides better noise immunity since a lower input impedance can be set up.
However, in applications where noise is not a problem, the high level may be applied with a single resistor, as is
done with R15 in this circuit.
When V
CC
is first applied, if V
CC
comes up slowly (around 10 mV/ms or slower) the motor may turn somewhat
even though the circuit is in stop mode. This is because the S/S pin input voltage is provided through a two-
resistor voltage divider and when V
CC
is still relatively low, the S/S pin input voltage will be below 2.6 V, which
is the start mode input level. If it is impossible to increase the speed with which the power voltage is brought up
and this is a problem, a capacitor may be inserted between V
CC
and the S/S pin to resolve the problem.
13. Through currents due to the direct PWM technique
In the direct PWM technique, through currents may flow in the output due to the switching. (This occurs in both
discrete component implementations as well as with the LB1822.) This is due to the delay and parasitic capacitors in
the output transistors. Earlier application used capacitors to deal with this problem if it occurred. However, since this
IC includes circuits designed to deal with this phenomenon, there is no need for external components to deal with
these currents. During switching, whiskers of up to about 10 ns may appear in the RF waveform, but they will not
cause problems in applications.
14. Oscillators
Normally, applications using this IC will use a crystal oscillator. However, it may be possible to use a ceramic
oscillator in applications in which the requirements on the speed control characteristics are not demanding. To avoid
problems, always consult the manufacturer of the oscillator element concerning the values of the external capacitors
and resistors used.
15. IC internal power dissipation calculation (calculated for V
CC
= 12 V with typical specifications)
Power dissipation due to the supply current (I
CC
)
Stop mode:
P1 = V
CC
×
I
CC
1 = 12
×
34 m = 0.41 W
Start mode:
P2 = V
CC
×
I
CC
2 = 12
×
8 m = 0.08 W
Power dissipation when a –10-mA load current is drawn from the 7-V fixed voltage output.
P3 = (V
CC
– 7)
×
10 m = 5
×
10 m = 0.05 W
Power dissipation due to the output drive current (when the output duty is 100%)
P4 = {(V
CC
–1)
2
/8k} + {(V
CC
– 2)
2
/10k} = (11
2
/2k) + (10
2
/4k) = 0.09 W
Power dissipation in the output transistors (when I
O
= 2 A, the output duty is 100%)
P5 = V
O
(sat)2
×
I
O
= 2.7
×
2 = 5.4 W
Therefore, the IC overall power dissipation will be:
Start mode:
P = P2 = 0.08 W
Stop mode:
P = P1 + P3 + P4 + P5 = 5.95 W
(For an output duty of 100%)
No. 5679-7/10
LB1922
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參數(shù)描述 |
|---|---|
| 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 |
| LB1927 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Office Automation Equipment 3-phase Brushless Motor Driver |
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