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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)： | 10/11頁 |
| 文件大?。?/td> | 172K |
| 代理商： | LB1921 |
LB1921
No.5439-8/11
5. PWM Frequency
The PWM frequency is determined by the resistor and capacitor (R3 and C6) connected to the CR pin.
When R3 is connected to the 4V fixed voltage supply
fPWM ≈ 1/(1.2×C×R)
When R3 is connected to the 7V fixed voltage supply
fPWM ≈ 1/(0.5×C×R)
R3 should not be any smaller than 30k
. A PWM frequency of about 15kHz is desirable. If the PWM frequency is
too low the motor will vibrate at the PWM frequency when the motor is restrained causing disturbing audible noise.
Inversely, switching loss increases if the PWM frequency is too high.
6. Ground Leading
GND1 (pin 22) is the ground for circuits other than the output block.
GND2 (pin 11) is the ground for the output block (emitters of the sink transistors).
D4, D5 and D6 are connected to GND2. All other external components are connected to GND1. The GND1 and
GND2 lines are connected to a single ground point at the connector. Since GND2 carries large currents, it should be
kept as short as possible.
7. Output Parasitic Effects
Parasitic effects occur when the output pin voltage falls -0.7V (this value decreases as the temperature increases)
below the GND1 and GND2 voltage. Similarly, the output pin voltage should not be allowed to exceed VCC by
more than 1V. When parasitism occurs, initially speed control is lost intermittently, but if the amount of parasitism
increases the output transistors can be destroyed. Schottky diodes with a small Vf are used for D1, D2 and D3 to
prevent through currents. As a result, the potential difference between the output pins and VCC is not that much of
a problem. Although normal rectifying diodes can be used for D4, D5 and D6, the printed circuit board pattern must
be kept as short as possible (as recommended in item 6) to prevent parasitism from occurring.
8. External Interface Pins
LD pin
Output type :
Open collector
Breakdown voltage :
Maximum supply voltage of 30V
Saturation voltage sample-to-sample variation (reference value) (ILD = 10mA)
0.10 to 0.15V
FGS pin
Output type :
Open collector
Breakdown voltage :
Maximum supply voltage of 30V
Saturation voltage sample-to-sample variation (reference value) (IFGS = 2mA)
0.12 to 0.18V
The FGS pin outputs the FGS amplifier output converted to a pulse output by a hysteresis comparator for use in
speed monitoring. The pull-up resistor is not required when this pin is not used.
Start/stop pin
Input type :
PNP transistor base with a 50k
pull-down resistor to ground.
Threshold level (typical) : about 2.6V
In stop mode, the 4V, 5V, and 7V fixed voltage power supplies are turned off.
F/R pin
Input type :
PNP transistor base with a 50k
pull-down resistor to ground.
Threshold level (typical) : about 2.2V (high to low), about 2.7V (low to high)
Hysteresis :
about 0.5V
F/R switching must be done when stopped.
9. Fixed Voltage Power Supply Temperature Characteristics
4V power supply : about -0.5mV/°C (typical)
5V power supply : about -0.6mV/°C (typical)
7V power supply : about -2.5mV/°C (typical)
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