Turn-off circuit for an LDMOS in presence of a reverse current

Details Turn-off circuit for an LDMOS in presence of a reverse current Turn-off circuit for an LDMOS in presence of a reverse current

1998-06-11

2000-06-13

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327427, 327589, 327324, H03K 17687

Patent

active

060753919

ABSTRACT:
A circuit for charging a capacitance using an LDMOS integrated transistor functioning as a source follower and controlled, in a manner to emulate a high voltage charging diode of the capacitance. The LDMOS transistor is controlled via a bootstrap capacitor charged by a diode at the supply voltage of the circuit, and by an inverter driven by a logic control circuit as a function of a Low Gate Drive Signal and of a second logic signal which is active during a phase wherein the supply voltage is lower than the minimum switch-on voltage of the integrated circuit. The circuit uses a first zener diode to charge the bootstrap capacitor and the source of the transistor is connected to the supply node through a second zener diode.

REFERENCES:
patent: 5373435 (1994-12-01), Jayaraman et al.
patent: 5689208 (1997-11-01), Nadd
patent: 5883547 (1999-03-01), Diazzi et al.

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