ZHCSQS2I January 1983 – July 2022 TL494
PRODUCTION DATA
使用的开关电路如图 39 所示。
所需电感器 (L) 尺寸为:
d | = | duty cycle = VO/VI = 5V/32V = 0.156 |
f | = | 20kHz (design objective) |
ton | = | time on (S1 closed) = (1/f) × d = 7.8μs |
toff | = | time off (S1 open) = (1/f) – ton = 42.2μs |
L | ≉ | (VI – VO) × ton/ΔIL |
≉ | [(32V – 5V) × 7.8μs]/1.5A | |
≉ | 140.4μH |