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参数资料
| 型号： | LB1824 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2.5 A, PDIP28 |
| 封装： | HEAT SINK, SDIP-28 |
| 文件页数： | 10/10页 |
| 文件大小： | 116K |
| 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 VCC is slow (under about 10 V/ms) the motor may turn to some extent (in stop mode) when
VCC is first applied. This is because the S/S input voltage is resistor divided, and when VCC 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 VCC 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 VCC of 24 V and typical ratings)
Power dissipation due to the power supply current (ICC)
At start time:
P1 = VCC × ICC1 = 24 × 34 m = 0.82 W
At stop time:
P2 = VCC × ICC2 = 24 × 8 m = 0.19 W
Power dissipation when a –10 mA load current is taken from the 7 V fixed voltage output
P3 = (VCC – 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 = {(VCC – 1)2/8 k}+{(VCC – 2)2/10 k}
= (232/8 k) + (222/10 k) = 0.12 W
Power dissipation in the output transistor (For IO = 2 A and an output on duty of 100%)
P5 = VOsat2 × IO = 2.7 × 2 = 5.4 W
Therefore the IC overall power dissipation is:
At stop time:
LB1824
No. 4264-9/10
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