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参数资料
| 型号： | LB1922 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 3.1 A, PDIP28 |
| 封装： | HEAT SINK, SDIP-28 |
| 文件页数： | 8/10页 |
| 文件大小： | 101K |
| 代理商： | LB1922 |
10. FG amplifier
The FG amplifier gain is determined by R1 and R2, and the DC gain, G, will be R2/21. The FG amplifier frequency
characteristics are determined by C4 and C5. (R1 and C4 form a high-pass filter and R2 and C5 form a low-pass
filter.) Since the FG amplifier output is input to a Schmitt comparator, set up values for R1, R2, C4, and C5 so that
the FG amplifier output has an amplitude of at least 250 mV p-p. (It is desirable to set up the FG amplifier so that its
output has an amplitude of between 1 and 3 V p-p during steady state motor operation.)
11. External capacitors
C3
C3 is required to stabilize the FGIN+ pin fixed-voltage supply and to generate the initial reset pulse for the IC
internal logic. Although a relatively small capacitance suffices for power supply stabilization, a larger capacitance
(about 4.7 F) is required to generate the reset pulse. The reset pulse is generated at the time when the FGIN+ pin
goes from 0 V to about 1.3 V. If the reset function does not operate, the LD pin may go on briefly at startup. If this
phenomenon is not a problem, a capacitance of around 0.1 F can be used for C3. After C3 is charged to 4 V, if
VCC is turned off (or the IC is set to stop mode), the capacitor will be discharged by an IC-internal load of about
10 k
that is connected to this capacitor.
C1 and C2
C1 and C2 are required for fixed-voltage supply stabilization. Since this IC adopts a direct PWM technique and
switches large currents in the outputs, it is extremely easy for noise to be generated. Therefore, adequate power-
supply stabilization is required to prevent that noise from causing incorrect circuit operation. C1 through C3 must
be connected to GND1 with lines that are as short as possible. In particular, C1 can easily influence system
characteristics and requires care.
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 VCC is first applied, if VCC 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 VCC 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 VCC 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.
No. 5679-7/10
LB1922
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相关代理商/技术参数 |
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