JP2006319213A - 半導体装置 - Google Patents
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Abstract
【解決手段】ワイドバンドギャップ半導体よりなる半導体素子部の表側の面に50μm以上の厚さの金属電極を接触させて放熱効果を高めた縦型の主FET31と、負荷短絡時に主FET31を流れる飽和電流を制限する過電流制限手段32を備える。過電流制限手段32は、主FET31と並列に接続された電流検出用トランジスタ33を備えており、電流検出用トランジスタ33を流れる電流が大きくなると主FET31のゲート電圧を低くするように動作して、主FET31を流れる電流量を制限する。
【選択図】 図8
Description
21 金属電極
31 電界効果トランジスタ
32 過電流制限手段
33 電流検出用トランジスタ
Claims (8)
- シリコンよりもバンドギャップが広い半導体材料でできている半導体素子部の表側の面に、少なくとも前記半導体素子部の表側の面と接触する部分がアルミニウムまたはアルミニウム合金でできており、かつ厚さが50μm以上である金属電極が接触した構成のパワースイッチング用nチャンネル電界効果トランジスタと、
負荷短絡時に前記電界効果トランジスタを流れる飽和電流を所定の電流値以下に制限する過電流制限手段と、
を備えることを特徴とする半導体装置。 - 前記過電流制限手段は、前記電界効果トランジスタのソース−ドレイン間絶対最大定格電圧Vbに対して、ソース−ドレイン間の電源電圧Vds(max)が(2/3)Vbであり、ゲート−ソース間電圧Vgsが定常オン状態のゲート電圧であるとき、ドレイン飽和電流Jd(sat)が1.5×106/Vbよりも小さくなるように制限することを特徴とする請求項1に記載の半導体装置。
- 前記過電流制限手段は、前記電界効果トランジスタと同一の半導体基板上に形成され、かつ前記電界効果トランジスタと並列に接続された電流検出用トランジスタを有し、該電流検出用トランジスタを流れる電流が大きくなると前記電界効果トランジスタのゲート電圧を低くすることにより、前記電界効果トランジスタの発生損失を、前記ドレイン飽和電流Jd(sat)が1.5×106/Vds(max)よりも小さくなるように抑制することを特徴とする請求項2に記載の半導体装置。
- 前記過電流制限手段は、前記電流検出用トランジスタを除いて、前記半導体基板よりも熱伝導率が悪い材料により前記電界効果トランジスタから物理的に分離されていることを特徴とする請求項3に記載の半導体装置。
- 前記半導体素子部は、SiC、GaN、AlGaN、ZnOおよびダイアモンドのいずれか一つ、または二つ以上の組み合わせでできていることを特徴とする請求項1〜3のいずれか一つに記載の半導体装置。
- 前記金属電極は、Al、Ti、Ni、Cu、Ag、Au、WおよびMoのいずれか一つ、または二つ以上の組み合わせよりなる積層構造もしくは合金でできていることを特徴とする請求項1〜4のいずれか一つに記載の半導体装置。
- 電界効果トランジスタと、
負荷短絡時に前記電界効果トランジスタを流れる飽和電流を制限する過電流制限手段と、を備え、
前記過電流制限手段は、前記電界効果トランジスタのソース−ドレイン間絶対最大定格電圧Vbに対して、ソース−ドレイン間の電源電圧Vds(max)が(2/3)Vbであり、ゲート−ソース間電圧Vgsが定常オン状態のゲート電圧であるとき、ドレイン飽和電流Jd(sat)が3.6×105/Vb以上で、かつ1.5×106/Vbよりも小さくなるように制限することを特徴とする半導体装置。 - 前記過電流制限手段は、前記電界効果トランジスタと同一の半導体基板上に形成され、かつ前記電界効果トランジスタと並列に接続された電流検出用トランジスタを有し、該電流検出用トランジスタを流れる電流が大きくなると前記電界効果トランジスタのゲート電圧を低くすることにより、前記電界効果トランジスタの発生損失を、前記ドレイン飽和電流Jd(sat)が1.5×106/Vds(max)よりも小さくなるように抑制することを特徴とする請求項7に記載の半導体装置。
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009033036A (ja) * | 2007-07-30 | 2009-02-12 | Hitachi Ltd | 半導体装置及びこれを用いた電気回路装置 |
JP2010258328A (ja) * | 2009-04-28 | 2010-11-11 | Fuji Electric Systems Co Ltd | ワイドバンドギャップ半導体装置 |
JP2011018841A (ja) * | 2009-07-10 | 2011-01-27 | Mitsubishi Electric Corp | 電力用半導体装置および電力用半導体装置の製造方法 |
JP2012033731A (ja) * | 2010-07-30 | 2012-02-16 | Mitsubishi Electric Corp | 電力用半導体素子 |
US20120306086A1 (en) * | 2011-06-01 | 2012-12-06 | Sumitomo Electric Industries, Ltd. | Semiconductor device and wiring substrate |
US8884309B2 (en) | 2010-06-03 | 2014-11-11 | Rohm Co., Ltd. | AC switch having compound semiconductor MOSFETs |
US9406668B2 (en) | 2013-03-27 | 2016-08-02 | Panasonic Intellectual Property Management Co., Ltd. | Power semiconductor element |
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US20120306086A1 (en) * | 2011-06-01 | 2012-12-06 | Sumitomo Electric Industries, Ltd. | Semiconductor device and wiring substrate |
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CN113299762A (zh) * | 2021-06-11 | 2021-08-24 | 贵州雅光电子科技股份有限公司 | 一种具有低导通压降的槽栅型超势垒整流器件 |
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