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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PS2625 데이터시트(PDF) 5 Page - NEC |
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PS2625 데이터시트(HTML) 5 Page - NEC |
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5 / 38 page  4 As judged from expression (1), the turn-off time toff is affected by collector-base capacitance CC-B, D.C. current amplification factor hFE, and load resistance LR. In actual circuit design, CC-B and hFE are fixed. Accordingly, the turn-off time is significantly affected by the resistance of load RL. Graph 1 shows the relationship between response speed (ton,toff) and load resistance (RL) in typical emitter follower (test circuit 1) having a load resistance of 100 Ω. PW = 100 µs Duty = 1/10 Input monitor () VCC = 5 V Vo RL = 100 Ω 51 Ω IF = 5 mA PS2601 Input monitor Vo Graph 1 Up : Input 0.2 V/DIV DOWN : Output 0.5 V/DIV (50 µs/DIV) Test Circuit 1 90% 90% 10% 10% 50% Input Output ton toff Figure 2-2. ton/toff Measuring Points |
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