Current detecting circuit, load drive, and storage

A current detection circuit and current detection technology, applied in measurement devices, measurement of current/voltage, measurement of electrical variables, etc., can solve problems such as power efficiency reduction, current detection resistance loss, inability to detect load current, etc., to reduce power consumption. Effect
CN1922496AInactive Publication Date: 2007-02-28ROHM CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ROHM CO LTD
Publication Date
2007-02-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

A current detecting circuit for stably detecting the current flowing through a load at all times with high accuracy by greatly reducing the power loss due to the detection of the current. The power supply voltage and a switch signal are supplied commonly to a power transistor and a current detecting transistor. An idling current is supplied to the output node of the current detecting transistor. A buffer circuit is provided so that the output voltages of both transistors may be the same virtual potentials. As a result, the buffer circuit is operated as a class-A amplifier circuit at all times.
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Description

technical field

[0001] The present invention relates to a current detection circuit that stably and accurately detects the current flowing in a load such as a spindle motor for storage devices such as HDDs and FDDs, a load drive circuit using the current detection circuit, and a device with a load drive circuit driven by the load drive circuit. storage device for the motor. Background technique

[0002] As a current detection circuit for detecting the current flowing in a load driven by a transistor, etc., a current detection resistor is connected in series to the transistor or the load, and the current is directly detected by the voltage drop caused by the current detection resistor. Generally, the current The detection circuit is used as disclosed in JP-A-11-299292 (hereinafter referred to as Patent Document 1) or JP-A-2003-174766 (hereinafter referred to as Patent Document 2).

[0003] Furthermore, there is known a current detection circuit disclosed in Japanese Patent N...

Claims

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