JP2003198277A5 - - Google Patents
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- JP2003198277A5 JP2003198277A5 JP2001393301A JP2001393301A JP2003198277A5 JP 2003198277 A5 JP2003198277 A5 JP 2003198277A5 JP 2001393301 A JP2001393301 A JP 2001393301A JP 2001393301 A JP2001393301 A JP 2001393301A JP 2003198277 A5 JP2003198277 A5 JP 2003198277A5
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- JP
- Japan
- Prior art keywords
- load
- point
- limit value
- current limit
- voltage
- Prior art date
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Description
【0005】
P3点でクランプされた後、さらに負荷4の抵抗が小さくなっていき、負荷4が短絡するまで、出力端子2の電位Voは下降していく。このとき、MOSトランジスタ11のゲート・ソース間は、2個のダイオード18によりクランプされているが、出力端子2の電位Voの下降に伴い、チャージポンプ14の昇圧電位Vcpと出力端子2間の電圧は増加する。その結果、この電圧により抵抗15を介して2個のダイオード18に流れる電流が増加し、2個のダイオード18の順方向電圧の和のクランプ電圧も増加し、図4に示すように、P3点から負荷4が短絡するP4点まで、MOSトランジスタ11のゲート・ソース間電圧が増加し、P4点でクランプ電圧は最大となる。従って、P3点での電流制限値より負荷4が短絡するP4点での電流制限値が大きくなる。負荷短絡時の電流制限値が大きくなり過ぎると、負荷短絡の耐量が低くなるため、電流制限値を設定するとき、負荷4が短絡するときの電流制限値を基準に設計する必要があり、低目に設定しなければならず、電流制限値を大きく設定できないという問題があった。[0005]
After being clamped at the point P3, the resistance of the load 4 further decreases, and the potential Vo of the output terminal 2 decreases until the load 4 is shorted. At this time, between the gate and source of MOS transistor 11 is clamped by two diodes 18, but with the drop of potential Vo of output terminal 2 , the voltage between boosted potential Vcp of charge pump 14 and output terminal 2 Will increase. As a result, the current flowing to the two diodes 18 through the resistor 15 is increased by this voltage, and the clamp voltage of the sum of the forward voltages of the two diodes 18 is also increased, as shown in FIG. The voltage between the gate and the source of the MOS transistor 11 increases from the point P4 to the point P4 at which the load 4 is shorted, and the clamp voltage becomes maximum at the point P4. Therefore, the current limit value at point P4 where the load 4 is shorted is larger than the current limit value at point P3. If the current limit value at the time of load shorting becomes too large, the load shorting resistance decreases, so when setting the current limit value, it is necessary to design based on the current limit value at the time of load 4 shorting. There is a problem that the current limit value can not be set large because it has to be set on the eye.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001393301A JP3802412B2 (en) | 2001-12-26 | 2001-12-26 | MOS transistor output circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001393301A JP3802412B2 (en) | 2001-12-26 | 2001-12-26 | MOS transistor output circuit |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2003198277A JP2003198277A (en) | 2003-07-11 |
JP2003198277A5 true JP2003198277A5 (en) | 2005-03-17 |
JP3802412B2 JP3802412B2 (en) | 2006-07-26 |
Family
ID=27600332
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2001393301A Expired - Fee Related JP3802412B2 (en) | 2001-12-26 | 2001-12-26 | MOS transistor output circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3802412B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4502177B2 (en) * | 2003-10-14 | 2010-07-14 | ルネサスエレクトロニクス株式会社 | Output circuit |
JP5279252B2 (en) * | 2007-12-12 | 2013-09-04 | ローム株式会社 | Switch output circuit |
JP5223758B2 (en) * | 2009-04-06 | 2013-06-26 | 株式会社デンソー | Driving circuit for power conversion circuit |
JP5535258B2 (en) * | 2012-03-01 | 2014-07-02 | 旭化成エレクトロニクス株式会社 | Power connection circuit |
JP7023561B2 (en) * | 2016-08-30 | 2022-02-22 | エイブリック株式会社 | Charge / discharge control circuit and battery device equipped with this |
CN111277253A (en) * | 2019-12-31 | 2020-06-12 | 启攀微电子(上海)有限公司 | High-voltage load switch circuit with constant current function |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0691262B2 (en) * | 1988-05-09 | 1994-11-14 | 日本電気株式会社 | Semiconductor device |
JPH02197213A (en) * | 1989-01-23 | 1990-08-03 | Fuji Electric Co Ltd | Load driving gear equipped with overcurrent prevention circuit |
JPH04170206A (en) * | 1990-11-02 | 1992-06-17 | Fujitsu Ltd | Temperature rise limit circuit |
JP3018816B2 (en) * | 1993-02-22 | 2000-03-13 | 株式会社日立製作所 | Semiconductor element protection circuit and semiconductor device having the same |
JP3555680B2 (en) * | 2000-11-29 | 2004-08-18 | 関西日本電気株式会社 | Semiconductor device |
JP2002368594A (en) * | 2001-06-11 | 2002-12-20 | Matsushita Electric Ind Co Ltd | Load driving device |
-
2001
- 2001-12-26 JP JP2001393301A patent/JP3802412B2/en not_active Expired - Fee Related
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