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參數(shù)資料
| 型號： | LB1824 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Power Brushless Motor Driver for OA Equipment |
| 中文描述： | 功率無刷電機驅(qū)動的辦公自動化設備 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 134K |
| 代理商： | LB1824 |
C1 and C2
C1 and C2 are required for fixed voltage power supply stabilization. Since this IC adopts a direct PWM method
and a large current is switched at the output, noise is generated extremely easily. Accordingly, adequate
stabilization is required on the power supplies so that noise does not cause incorrect circuit operation.
The connections between C1, C2 and C3 and ground should be kept as short as possible. Special care should be
exercised with respect to C1, since its characteristics are easily influenced by grounding problems.
12.External resistors
R4 and R5
R4 and R5 are used to apply a high level to the F/R pin. Since there is a pull-down resistance of about 50 k
on
the F/R input pin it goes low when open. A high level input to the F/R pin should be at least 4.0 V and not more
than 6.3 V.
R15
R15 is used to apply a high level to the S/S pin. Since there is a pull-down resistance of about 50 k
on the S/S
input it goes low when open. (In the start state a high level input to the S/S pin should be at least 4.0 V and not
more than 6.3 V.) As is the case with the F/R pin, the resistance is divided into 2 resistors, and while this scheme
is resistant to noise (since the input impedance can be lowered), if 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 the initial rise in V
CC
is slow (under about 10 V/ms) the motor may turn to some extent (in stop mode) when
V
CC
is first applied. This is because the S/S input voltage is resistor divided, and when V
CC
is under 12 V, the
input voltage will be under 2.6 V (the start input level). If the rise slope cannot be increased and this phenomenon
is a problem, it can be handled by connecting a capacitor between V
CC
and S/S.
13.Through currents due to the direct PWM method
In the direct PWM method through currents flow in the outputs due to the switching, e.g., when used in a discrete
structure or in LB1822 applications. This is due to the output transistor’s delay and parasitic capacitance. Previously,
an external capacitor was used to handle this kind of situation. However, the LB1824 provides internal circuit
measures to handle this problem, and no measures based on external components are required. Although an overshoot
with a duration of under 10 ns will appear on the RF voltage waveform during switching, this will not be a problem.
14.Oscillator
A crystal oscillator is normally used with the LB1824. If the speed control conditions are not critical, a ceramic
oscillator could be used. To avoid problems always consult the oscillator’s manufacturer concerning the oscillator
itself and the external resistances and capacitances used.
15.IC internal power dissipation calculation example (calculation for a V
CC
of 24 V and typical ratings)
Power dissipation due to the power supply current (I
CC
)
At start time:
P1 = V
CC
×
I
CC1
= 24
×
34 m = 0.82 W
At stop time:
P2 = V
CC
×
I
CC2
= 24
×
8 m = 0.19 W
Power dissipation when a –10 mA load current is taken from the 7 V fixed voltage output
P3 = (V
CC
– 7)
×
10 m = 17
×
10 m = 0.17 W
Power dissipation due to the output drive current (for an output on duty of 100%)
P4 = {(V
CC
– 1)
2
/8 k}+{(V
CC
– 2)
2
/10 k}
= (23
2
/8 k) + (22
2
/10 k) = 0.12 W
Power dissipation in the output transistor (For I
O
= 2 A and an output on duty of 100%)
P5 = V
Osat2
×
I
O
= 2.7
×
2 = 5.4 W
Therefore the IC overall power dissipation is:
At stop time:
LB1824
No. 4264-8/9
相關PDF資料 |
PDF描述 |
|---|---|
| LB1825 | Three-Phase Brushless Motor Driver |
| LB1830 | Low-Saturation Bidirectional Motor Driver for Low-Voltage Applications |
| LB1830M | Low-Saturation Bidirectional Motor Driver for Low-Voltage Applications |
| LB1831M | Low-Saturation Bidirectional Motor Driver for Low-Voltage Applications |
| LB1832V | Low-Saturation 1.5-Channel 3 V Drive Bidirectional Driver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LB1825 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Three-Phase Brushless Motor Driver |
| LB1830 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Low-Saturation Bidirectional Motor Driver for Low-Voltage Applications |
| LB1830M | 制造商:Panasonic Industrial Company 功能描述:IC |
| LB1830M_11 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Low-Voltage, Low-Saturation Bidirectional Motor Driver |
| LB1830MC | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Bidirectional Motor Driver |
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