发明名称 |
DC-DC converter and control circuit for DC-DC converter |
摘要 |
A DC-DC converter prevents through current from flowing in an output transistor. A first transistor receives an input voltage. A second transistor is connected to the first transistor. A comparator is connected to the second transistor. The comparator detects current flowing through a choke coil based on the potential difference between two terminals of the second transistor to generate a switching control signal for turning the second transistor on and off. The second transistor and the comparator form an ideal diode. A control circuit of the DC-DC converter generates an activation signal for turning the first transistor on and off based on a pulse signal to keep an output voltage constant. A through current prevention pulse generation circuit generates a pulse signal for turning off the second transistor from before the first transistor is turned on to after the first transistor is turned on.
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申请公布号 |
US2007145961(A1) |
申请公布日期 |
2007.06.28 |
申请号 |
US20060436534 |
申请日期 |
2006.05.19 |
申请人 |
FUJITSU LIMITED |
发明人 |
HASEGAWA MORIHITO;TSUCHIYA CHIKARA;ITO HIDENOBU |
分类号 |
G05F1/00 |
主分类号 |
G05F1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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