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L4981B Datasheet(PDF) 11 Page - STMicroelectronics |
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L4981B Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 17 page  Figure 16: Programmable Under Voltage Lock- out Thresholds Table 1: Programmable Under Voltage Lockout Thresholds. VCC ON VCC OFF R22 R23 11V 10V 82k Ω 12k Ω 12V 10.1V 220k Ω 33k Ω 13V 10.5V 430k Ω 62k Ω 14V 10.8V 909k Ω 133k Ω 14.5V 10.9V 1.36M Ω 200k Ω 15V 11V 2.7M Ω 390k Ω Vl 0.8 1 0.4 0.2 0 0 45 90 135 Electrical degrees 180 0.8 1 0.4 0.2 0 fsw Figure 17: Modulation Frequency Normalized in an Half Cycle of the Mains Voltage Figure 18: Oscillator Diagram R22 = R23 ⋅ 6.8 R23 (Kohm) L4981A - L4981B 11/17 |
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