| US 7,586,716 B2 | ||
| Regulator with shunt over-current by-pass | ||
| Daisuke Yamazaki, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Aug. 24, 2007, as Appl. No. 11/892,571. | ||
| Application 11/892571 is a continuation of application No. PCT/JP2005/003210, filed on Feb. 25, 2005. | ||
| Prior Publication US 2007/0290660 A1, Dec. 20, 2007 | ||
| Int. Cl. H02H 7/00 (2006.01) | ||
| U.S. Cl. 361—18 [361/56] | 13 Claims |
| 1. A shunt regulator controlling a supply voltage within a given range, the shunt regulator comprising:
a bypass transistor connected between power supply terminals and bypassing an excessive current flowing when the supply voltage
increases;
a bypass control circuit applying a constant voltage to the source of the bypass transistor, and applying a threshold voltage
of the bypass transistor between a node of the power supply terminal on the source side and the gate;
a resistor connected between the node of the power supply terminal on the source side and the gate; and
a capacitor connected between a node of the power supply terminal on the drain side and the gate.
|