| 摘要 |
If DMOS transistors M1 and M2 are off, parasitic diodes (D11, D12, D21, D22) constitute the only routes through which a current can flow to the drains of the DMOS transistors M1 and M2. The drains of the DMOS transistors M1 and M2 are on the cathode sides of the parasitic diodes (D11, D12, D21, D22). The drain voltage is therefore the highest voltage on the anode sides (terminal T1, terminal T2, semiconductor substrate 5) of the parasitic diodes (D11, D12, D21, D22). In other words, the potentials of the drains of the DMOS transistors M1 and M2 do not drop below the reference potential SB of the semiconductor substrate 5, irrespective of the voltage applied to the terminals T1 and T2. |
