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2024-9-14 15:26 |
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签到天数: 9 天 [LV.3]偶尔看看II
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和这个电路很像
5 Z1 A. N5 z! L' S! }Load Dump Protection：
& M3 V$ X1 F3 K1 ?) s W9 p9 ?( L4.4 Load Dump Protection% u: z& K {$ ?/ G; m
The ISO7637-2 norm, see Section 3.3, “ISO7637-2 Norm”, specifies the load dump test pulse 5: +174V,* p$ d' Z: _0 A$ o8 Z+ }
duration 350ms." c$ ~4 `# I2 t" O9 `1 m) Z3 O8 l' |
In the case of a load dump condition, the Q1 P-MOSFET turns OFF and disconnects the power supply line. a2 l# b2 F" ]) G2 k( k
Whenever the C3 voltage rises above 32V, the zener diode D4 opens and the Q2 turns OFF the Q1. If the
2 ~6 l( f; w6 |$ u+ b/ p; v) pC3 voltage drops down below 32V, the Q2 turns ON the Q1.3 v: L$ G; R q( s# C; M6 a2 e: Y# C
The diode D2 limits the Q1 gate-to-source voltage.) n5 J# x- b/ u8 C
# Z" u: f- c( H# D' \
2 X: O$ [2 e, M% \1 t
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发表于 2018-4-19 08:26
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支持！
反对！
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