DCDC converter high-level effective forbidding circuit
It is a technology that prohibits the circuit and high level. It is applied in the direction of converting DC power input to DC power output, instruments, electrical components, etc., which can solve the problem of inability to achieve output, and achieve the effect of simple and reliable circuit and good application value.
Pending Publication Date: 2021-12-24
SHENZHEN ZHENHUA MICROELECTRONICS
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Problems solved by technology
[0002] DC / DC converters sometimes use the prohibition circuit function to control the output of the DC / DC converter by controlling the enable and disable terminals. At present, the most commonly used prohibition function in the industry is to ground the enable and disable terminals to turn off the DC / DC For the output of the converter, when the prohibition function is not in use, the prohibition terminal is suspended in the air. This method is simple and reliable, but it can only simply control the presence or absence of the DC / DC converter output, and cannot control the DC / DC converter at different levels. output
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[0020] In order to describe the technical solution of the present invention more clearly and completely, the present invention will be further described below in conjunction with the accompanying drawings.
[0021] Please refer to figure 1 , the present invention proposes a high-level effective prohibition circuit of a DCDC converter, including an INH prohibition terminal, an optocoupler U1, an input voltage Vin, a triode Q1, and a COMP pin of a chip;
[0022] One end of the optocoupler U1 is connected to the INH prohibition end, and the other end is connected to the transistor Q1;
[0023] The input voltage Vin is also connected between the optocoupler U1 and the transistor Q1;
[0024] Transistor Q1 is connected to the COMP pin of the chip;
[0025] The input voltage Vin inputs a high level, when the INH prohibition terminal inputs a high level, the optocoupler U1 is turned on, and the transistor Q1 is turned off, and the voltage of the COMP pin of the chip is normal at th...
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The invention provides a DCDC converter high-level effective forbidding circuit which comprises an INH forbidding end, an optocoupler U1, an input voltage Vin, a triode Q1 and a COMP pin of a chip. The input voltage Vin is input into a high level, and when the INH prohibition end is input into the high level, the optocoupler U1 is conducted, the triode Q1 is cut off, and the voltage of the COMP pin of the chip is normal at the moment; the input voltage Vin is input into a high level, and when the INH prohibition end inputs a low level or is suspended, the optocoupler U1 is not conducted, the triode Q1 is conducted, and at the moment, the voltage of the COMP pin of the chip is lowered. According to the DCDC converter high-level effective forbidding circuit, output of the DC / DC converter can be controlled by different levels, and the circuit is simple and reliable and has good application value.
Description
technical field [0001] The invention relates to the field of circuit control, in particular to a high-level effective prohibition circuit of a DC-DC converter. Background technique [0002] DC / DC converters sometimes use the prohibition circuit function to control the output of the DC / DC converter by controlling the enable and disable terminals. At present, the most commonly used prohibition function in the industry is to ground the enable and disable terminals to turn off the DC / DC For the output of the converter, when the prohibition function is not in use, the prohibition terminal is suspended in the air. This method is simple and reliable, but it can only simply control the presence or absence of the DC / DC converter output, and cannot control the DC / DC converter at different levels. output. Contents of the invention [0003] In order to solve the above problems, the present invention proposes a DCDC converter active-high prohibition circuit. [0004] The present inve...
Claims
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IPC IPC(8): H02M3/156
CPCH02M3/1563
Inventor 杨丰窒卞震霆
Owner SHENZHEN ZHENHUA MICROELECTRONICS