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Switch device driving device and DC/DC current transformer

A technology for driving equipment and switching devices, which is applied in electronic switches, output power conversion devices, and DC power input into DC power output, etc., and can solve problems such as inability to use

Inactive Publication Date: 2004-01-28
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, such FET driver devices cannot be used in DC / DC converters (such as variable supply voltage ICs or DDR-SDRAM (Double Data Rate Synchronous Dynamic Random Access Memory))

Method used

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  • Switch device driving device and DC/DC current transformer
  • Switch device driving device and DC/DC current transformer
  • Switch device driving device and DC/DC current transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] figure 1 It is a circuit diagram embodying the synchronous rectification DC / DC converter adopting FET drive equipment of the present invention. As shown in the figure, the synchronous rectification DC / DC converter of this embodiment has a pair of N Trench MOS FETs (Metal Oxide Semiconductor FETs) N1 and N2 (hereinafter referred to as FETs N1 and N2) are used to obtain synchronous rectification. The desired output voltage VOUT is obtained from the node between FETs N1 and N2 through an LC filter (consisting of coil L1 and capacitor C1).

[0014] The drain of FET N1 is connected to the supply voltage line, and the source of FET N2 is connected to ground. The source of FET N1 and the drain of FET N2 are connected together, and their node "a" is connected to one end of coil L1. The other end of the coil L1 is connected to the output terminal and grounded through the capacitor C1. FETs N1 and N2 respectively have body diodes BD1 and BD2 (hereinafter referred to as diodes...

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Abstract

A switching device driving apparatus has a driver for controlling, according to an input signal, the on / off states of a pair of field-effect transistors connected in series between a first supply voltage and a second supply voltage lower than the first supply voltage, and a detector for detecting the on / off states of body diodes attached respectively to the field-effect transistors. Only after either of the body diodes is detected being on are the field-effect transistors respectively turned on to produce an output corresponding to the input signal. This makes it possible to securely prevent the two FETs from being turned on simultaneously independently of their characteristics and type.

Description

technical field [0001] The invention relates to a driving device for controlling the switching operation of a pair of field effect transistors (FETs) connected in series between two different potentials to function as switching means. The invention also relates to a DC / DC converter using such a drive device. Background technique [0002] A synchronous rectification DC / DC converter has a pair of FETs connected in series between two different potentials (between the input potential and the ground potential) to act as a switching device to obtain synchronous rectification, and through an LC filter from both The node between each FET outputs the desired voltage. This synchronous rectification DC / DC converter uses a FET driving device to control the switching operation of the FETs, and this driving device has a function of preventing two FETs from being turned on at the same time. This is because, if a flow-through current flows through both FETs, it may destroy the FETs or red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M1/08H02M1/38H02M3/158
CPCY02B70/1466H02M3/1588H02M1/38Y02B70/10H03K17/00
Inventor 梅本清贵竹村兴
Owner ROHM CO LTD