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參數(shù)資料
| 型號： | LB11847 |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1.75 A, PDIP28 |
| 封裝： | HEAT SINK, DIP-28 |
| 文件頁數(shù)： | 5/15頁 |
| 文件大?。?/td> | 150K |
| 代理商： | LB11847 |
LB11847
No.6183-13/15
4. Simultaneous ON prevention function
This IC incorporates a circuit to prevent feedthrough current when phase switching. For reference, the output ON and
OFF delay times at PHASE and ENABLE switching are given below.
Reference data * typical value
Sink side
Source side
ON delay time
1.9
μs
2.2
μs
PHASE switching
(Low
→ High)
OFF delay time
0.8
μs
1.8
μs
ON delay time
1.4
μs
1.7
μs
PHASE switching
(High
→ Low)
OFF delay time
0.9
μs
1.35
μs
ON delay time
2.15
μs
2.75
μs
ENABLE switching
OFF delay time
1.2
μs
5.8
μs
5. Noise canceler
This IC has a noise canceling function to prevent malfunction due to noise spikes generated when switching ON. The
noise cancel time tn is determined by internal resistance of the CR pin and the constant of the externally connected CR
components. The constant also determines the switching OFF time.
Figure 1 shows the internal configuration at the CR pin, and Figure 2 shows the CR pin constant setting range.
Equation when logic voltage VCC = 5V
CR pin voltage E1 = VCC R/(R1+R2+R) [V]
Noise cancel time tn ≈ (R1+R2) C 1n {(E1-1.5)/(E1-4.0)} [s]
Switching OFF time toff ≈ –R C 1n (1.5/E1) [s]
Internal resistance at CR pin : R1 = 1k
Ω, R2 = 300Ω (typ.)
*The CR constant setting range in Figure 2 on page 16 is given for reference. It applies to a switching OFF time in the
range from 8 to 100
μs. The switching time can also be made higher than 100μs. However, a capacitor value of more
than several thousand pF will result in longer noise canceling time, which can cause the output current to become
higher than the set current. The longer switching OFF time results in higher output current ripple, causing a drop in
average current and rotation efficiency. When keeping the switching OFF time within 100
μs, it is recommended to stay
within the CR constant range shown in Figure 2.
Internal configuration at CR pin
Figure 1
CR pin
E1
One-shot multi-blanking
time circuit
VCC line
R:15k
Ω
C:470pF
300
Ω
R1
R2
1k
Ω
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