LB1946 Просмотр технического описания (PDF) - SANYO -> Panasonic
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LB1946 Datasheet PDF : 16 Pages
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LB1946
1. Switching OFF time and noise cancellation time calculations
Notes on the CR pin setting (switching off time and noise canceller time)
The noise canceller time (Tn) and the switching off time (Toff) are set using the following formulas.
• When VCC=5V
Noise canceller time (Tn)
Tn ≈ CyRyln {(1.5 - RI)/(4.0 - RI)} [s]
CR pin charge current: 1.25mA
Switching off time (Toff)
Toff ≈ -CyRyln (1.5/4.8) [s]
Component value ranges
R: 5.6kΩ to 100kΩ
C: 470pF to 2000pF
• When VCC=3.3V
Noise canceller time (Tn)
Tn ≈ CyRyln {(1.06 - RI)/(2.66 - RI)} [s]
CR pin charge current: 0.7mA
Switching off time (Toff)
Toff ≈ -CyRyln (1.06/3.1) [s]
VCC line
One-shot multi-vibrator
blanking time circuit
CR pin
E1
Figure 2 CR Pin Internal Circuit Structure
No.7115-14/16
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