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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： | 7/10页 |
| 文件大小： | 101K |
| 代理商： | LB1922 |
Do not use a value of 30 k
or less for R3. A PWM frequency of about 15 kHz is desirable. If the PWM frequency is
too low, the motor may resonate at the PWM frequency during motor constraint, and if the PWM frequency is in the
audible range result in noise. Inversely, if the PWM frequency is too high, the loss in the output transistors during
switching will increase.
6. Ground leading
GND1 (pin 22) --- Ground for all circuits other than the output block
GND2 (pin 11) --- Output block ground (the sink transistor emitter)
D4, D5, and D6 must be connected to GND2. All other external components must be connected to GND1. A single
ground point must be taken for GND1 and GND2 at the connector. Since GND2 carries large currents, the GND2
lines must be kept as short as possible.
7. Parasitic effects in the output
Parasitic effects occur when the output pin voltage falls –0.7 V below the GND1 and GND2 potential. (Note that the
actual value may become smaller than –0.7 V due to device temperature characteristics.) Also, applications must be
designed so that the output pin voltage never exceeds VCC by 1 V or more. If a parasitic effect occurs, at first speed
control will be lost intermittently. If the parasitic effects increase, the output transistors may be destroyed. Since D1,
D2, and D3 are for through current prevention, use Schottky diodes with a small Vf. This will prevent the potential
difference between the output pins and VCC from becoming a problem. Although normal rectifying diodes can be
used for D4, D5, and D6, design the ground lines carefully as described in item 6, “Ground leading”, so that parasitic
effects do not occur.
8. External interface pins
LD pin
Output type: open collector
Voltage handling capacity: 20 V (absolute maximum)
Saturation voltage sample-to-sample variation reference value (ILD = 10 mA)
0.0 to 0.5 V
FGS pin
Output type: open collector
Voltage handling capacity: 20 V (absolute maximum)
Saturation voltage sample-to-sample variation reference value (IFGS = 2 mA)
0.12 to 0.18 V
The FGS pin output is the FG amplifier output converted to a pulse output by a hysteresis comparator. It is used
as a speed monitor. If the FGS pin is not used, the pull-up resistor is not required.
Start/Stop pin
Input type: PNP transistor base with a 50-k
pull-down resistor connected to ground
Threshold level (typical): About 2.6 V
The 4-V, 5-V, and 7-V fixed-voltage supplies are turned off in stop mode.
F/R pin
Input type: PNP transistor base with a 50-k
pull-down resistor connected to ground
Threshold level (typical): About 2.2 V (high
→ low), about 2.7 V (low → high)
Hysteresis: about 0.5 V
F/R switching must only be performed in stop mode when the motor is stopped.
9. Fixed-voltage supply temperature characteristics
4-V supply: about –0.5 mV/°C
5-V supply: about –0.6 mV/°C
7-V supply: about –2.5 mV/°C
No. 5679-6/10
LB1922
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