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參數(shù)資料
| 型號： | LB1921 |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 3.5 A, PDIP28 |
| 封裝： | HEAT SINK, SDIP-28 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大小： | 172K |
| 代理商： | LB1921 |
LB1921
No.5439-9/11
10. FG Amplifier
The resistors R1 and R2 set the FG amplifier gain, with the gain being determined by the formula G = R2/R1. The
capacitors C4 and C5 determine the FG amplifier frequency characteristics, with R1 and C4 forming a high-pass
filter and R2 and C5 forming a low-pass filter. Since the FG amplifier is followed by a Schmitt comparator, the
values of R1, R2, C4 and C5 must be set up so that FG amplifier output is over 250mVp-p. In particular, it is
desirable that the FG amplifier output be set up to be between 1 and 3V during steady-state rotation.
11. External Capacitors
C3
The capacitor C3 is required for FGIN+ pin fixed voltage power supply stabilization and IC internal logic initial
reset pulse generation. Although the value of this capacitor can be quite small for power supply stabilization, a
relatively large capacitance (about 4.7
F) is required for reset pulse generation. The reset pulse is generated
during the time the FGIN+ pin goes from 0 to about 1.3V. If the reset does not operate, LD will turn on briefly at
startup. If this phenomenon is not a problem, a capacitor of about 0.1
F can be used for C3. After C3 is charged to
4V, when VCC is turned off (or the motor is stopped), the charge on C3 is discharged through the IC internal
resistance to ground, which is about 10k
.
C1 and C2
The capacitors C1 and C2 are required for fixed voltage power supply stabilization. Since this IC adopts a direct
PWM drive scheme and switches large currents in the output, noise can occur easily. Thus the power supply must
be adequately stabilized so that this noise does not cause the IC to operate incorrectly. C1, C2 and C3 must be
connected as close as possible to GND1. In particular, C1’s characteristics are easily influenced and thus require
caution.
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 50k
, it is at the low level when open. Apply a voltage of over 4.0V and under 6.3V 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 50k
, it is at the low level when open. Apply a voltage of over 4.0V and under 6.3V 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 180k
is recommended.
If VCC rises slowly (less than about 10V/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 2.6V (the
start input level) when VCC is under 12V. If the rise rate cannot be increased and this phenomenon is a problem,
it can be resolved by connecting a capacitor between VCC 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 10ns 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.
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