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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： | 9/10页 |
| 文件大小： | 101K |
| 代理商： | LB1922 |
15. IC internal power dissipation calculation (calculated for VCC = 12 V with typical specifications)
Power dissipation due to the supply current (ICC)
Stop mode:
P1 = VCC × ICC1 = 12 × 34 m = 0.41 W
Start mode:
P2 = VCC × ICC2 = 12 × 8 m = 0.08 W
Power dissipation when a –10-mA load current is drawn from the 7-V fixed voltage output.
P3 = (VCC – 7) × 10 m = 5 × 10 m = 0.05 W
Power dissipation due to the output drive current (when the output duty is 100%)
P4 = {(VCC –1)2/8k} + {(VCC – 2)2/10k} = (112/2k) + (102/4k) = 0.09 W
Power dissipation in the output transistors (when IO = 2 A, the output duty is 100%)
P5 = VO (sat)2 × IO = 2.7 × 2 = 5.4 W
Therefore, the IC overall power dissipation will be:
Start mode:
P = P2 = 0.08 W
Stop mode:
P = P1 + P3 + P4 + P5 = 5.95 W
(For an output duty of 100%)
16. Techniques for measuring IC internal temperature increases
Thermocouple measurement
When using a thermocouple for temperature measurement, the thermocouple is attached to a fin on the heat sink.
While this measurement technique is simple, it suffers from large measurement errors when the thermal
generation process is not at steady state.
Measurement using IC internal diode properties
We recommend using the properties of the parasitic diode that exists between INTIN and ground for measuring the
temperature of this IC. (Sanyo data: For ID = 1 mA, the temperature characteristic is about 1.8 mV/°C.) The
external resistor must be disconnected when measuring the temperature.
17. Servo constants
The servo constant calculations depend strongly on the characteristics of the motor used and require special expertise.
Normally, the motor manufacturer will set up these constants. Sanyo can provide the data required for the servo
constant calculations. This data includes both the characteristics data for this IC as well as the frequency
characteristics simulation data for the filter characteristics set up by the motor manufacturer.
If the resistor (R10) between DOUT and INTIN is too small, then C8 and C9 will become excessively large, and if R10
is too large, then speed errors due to the speed discriminator shutoff current and the integrator input current will
become more likely to occur. Therefore, this resistor should have a value in the range 10 to 100 k
. If the resistor
(R8) between POUT and INTIN is too small, the influence of the PLL system will become excessive and the lock state
pull-in characteristics will be degraded. Thus the value of this resistor must not be made too small. We recommend a
value of around 1 M
when R10 is 75 k. Applications must be designed by first setting up only the speed
discriminator system (R9, R10, C8, and C9) and only then setting up the PLL system resistor R8.
No. 5679-8/10
LB1922
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相关代理商/技术参数 |
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