LB1847-E SANYO, LB1847-E Datasheet - Page 13

• Manufacturer Part Number: LB1847-E
• Description: IC MTR DRVR BPLR STEP DIP28H
• Manufacturer: SANYO

Specifications of LB1847-E

• Applications: Stepper Motor Driver
• Number Of Outputs: 1
• Voltage - Load: 10 V ~ 45 V
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.550", 12.7mm) Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Other names: 869-1250

4. Simultaneous ON prevention function
Reference Data * typical value
5. Noise canceler
ENABLE switching
PHASE switching
PHASE switching
This IC incorporates a circuit to prevent feed-through current when phase switching. For reference, the output ON and
OFF delay times at PHASE and ENABLE switching are given below.
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 the CR pin constant setting range.
Equation when logic voltage V CC = 5V
CR pin voltage E1 = V CC × 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 = 1kΩ, R2 = 300Ω (typ.)
*The CR constant setting range in Figure 2 on page 15 is given for reference. It applies to a switching OFF time in the
range from 8 to 100µs. The switching time can also be made higher than 100 ms. 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 ms, it is recommended to
stay within the CR constant range shown in Figure 2.
Internal configuration at CR pin
(Low → Hi)
(Hi → Low)
OFF deley time
OFF deley time
OFF deley time
ON delay time
ON delay time
ON delay time
Sink side
One-shot multi-blanking
time circuit
2.15µs
1.9µs
0.8µs
1.4µs
0.9µs
1.2µs
C:470pF
CR pin
Source side
1.35µs
2.75µs
LB1847
2.2µs
1.8µs
1.7µs
5.8µs
E1
Figure 1
R:15kΩ
300Ω
V CC line
R1
R2
1kΩ
No.5982-13/15