Load current supply circuit having current sensing function

Details Load current supply circuit having current sensing function Load current supply circuit having current sensing function

1997-06-27

1999-03-02

Nguyen, Matthew

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323315, G05F 320

Patent

active

058776176

ABSTRACT:
A load current supply circuit having a current sensing function is composed of a current mirror circuit which includes a power transistor circuit and a sense transistor circuit both connected in parallel with each other, and a current detection circuit connected to the sense transistor circuit. Load current is drawn through the power transistor while sensing current which is proportional to the load current and is much less than the load current flows through the sense transistor. The current detection circuit detects the load current based on the sensing current. A current mirror ratio has to be constant under a wide range of ambient temperature in order to secure a current sensing accuracy. To maintain the current mirror ratio at a substantially constant level, a resistance ratio of wiring resistance to transistor ON-resistance in the sense transistor circuit is made substantially equal to that in the power transistor circuit. For this purpose, compensating resistors may be disposed at both sides of the sense transistor in the sense transistor circuit.

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patent: 5281872 (1994-01-01), Mori

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