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参数资料
| 型号： | LB1693 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2.5 A, PDIP20 |
| 封装： | 0.500 INCH, DIP-20 |
| 文件页数： | 2/11页 |
| 文件大小： | 159K |
| 代理商： | LB1693 |
LB1693
No.3295-10/11
4. Current limiter circuits
4-1. Current limiter 1
The current is limited by moving the sink side transistor from saturated to undaturated, so ASO can be a problem.
I =
VRf1
Rf
(A)
Therefore, design so that as much as possible current limiter 1 is not triggered.
Also, take particular care not to exceed the maximum output current (2.5A) when current limiter 1 is triggered.
4-2. Current limiter 2
This circuit limits the current by lowering the PWM output duty, thus lowering the VM voltage.
When current limiter 2 is triggered, the output current is no greater than 2A.
I =
VRf2
Rf
(A)
When not controlling the PWM, add a current limiter to the VM power supply. (A current setting no greater than
60% to 70% of the current value of current limiter 1 and a short delay time are recommended.)
5. Protection circuits
5-1. Overvoltage protection circuit
If the voltage at the VCC pin rises above the regulated votlage (38V), PWM output is inhibited and the sink side
output driver is switched off.
5-2. Low-votlage protection circuit
If the voltage at the VCC pin falls below the regulated voltage, just as in 5-1, PWM output is inhibited and the sink
side output driver is switched off.
5-3. Thermal shutdown circuit
If the junction temperature rises above the regulated temperature, just as in 5-1, PMW output is inhibited and the
sink output driver is switched off.
6. Minimum voltage at VM power
Use a voltage greater than the VH voltage for the VM power supply votlage.
VM
≥ VH
Resistance, R – k
Ω
f – R
5
7
10
2
3
5
7
100
5
20
40
60
80
100
10
7
100
5
3
2
1.8
2.0
2.2
2.4
2.6
1.6
1.4
1.2
2.8
Oscillation
frequency,
f
–
kHz
Output voltage, VCONT –V
Duty Ratio – VCONT
0
1.0
Duty
cycle,
Duty
–
%
VCC = 24V
VH
CR
VCC
OSC
ON
90%
10%
OFF
Rx
10k
22k
t (
μs)
0.63
1.2
R
C
t
3300pF
1000pF
330pF
R = 39k
Ω
C = 2200pF
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| LB1694N | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:3-Phase Brushless Motor Driver |
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