CN212992205U - High-level effective inhibiting circuit of DCDC converter - Google Patents
High-level effective inhibiting circuit of DCDC converter Download PDFInfo
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- CN212992205U CN212992205U CN202021507726.1U CN202021507726U CN212992205U CN 212992205 U CN212992205 U CN 212992205U CN 202021507726 U CN202021507726 U CN 202021507726U CN 212992205 U CN212992205 U CN 212992205U
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Abstract
The utility model provides a DCDC converter high level effectively forbids circuit, including INH forbids end, opto-coupler U1, input voltage Vin, triode Q1, the COMP pin of chip; the input voltage Vin is input into a high level, when the INH forbidden end is input into the high level, the optocoupler U1 is conducted, the triode Q1 is cut off, and the voltage of a COMP pin of the chip is normal; the input voltage Vin is input to a high level, when the INH forbidden 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 a COMP pin of the chip is pulled low. Through the utility model discloses a DCDC converter high level effectively forbids circuit, can realize the output of different level control DC/DC converters, and the circuit is simple reliable, has good using value.
Description
Technical Field
The utility model belongs to the technical field of circuit control and specifically relates to a DCDC converter high level is effectively forbid circuit.
Background
The DC/DC converter sometimes uses the inhibit circuit function, controls the output of the DC/DC converter by controlling the enable inhibit terminal, the most commonly used inhibit function in the industry at present is grounding the enable inhibit terminal, turning off the output of the DC/DC converter, suspending the enable inhibit terminal when the inhibit function is not used, the method is simple and reliable, but only can simply control the output of the DC/DC converter, and can not control the output of the DC/DC converter with different levels.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the present invention provides a high level active disable circuit for a DCDC converter.
The utility model discloses a following technical scheme realizes:
the utility model provides a DCDC converter high level effectively forbids circuit, including INH forbids end, opto-coupler U1, input voltage Vin, triode Q1, the COMP pin of chip;
one end of the optocoupler U1 is connected with an INH forbidden end, and the other end of the optocoupler U1 is connected with a triode Q1;
an input voltage Vin is also connected between the optocoupler U1 and the triode Q1;
the triode Q1 is connected with a COMP pin of the chip;
the input voltage Vin is input into a high level, when the INH forbidden end is input into the high level, the optocoupler U1 is conducted, the triode Q1 is cut off, and the voltage of a COMP pin of the chip is normal;
the input voltage Vin is input to a high level, when the INH forbidden 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 a COMP pin of the chip is pulled low.
The utility model discloses a DCDC converter high level effectively forbids circuit further improves and lies in, and opto-coupler U1 includes 4 pins, wherein, connects emitting diode between 1 st foot and the 2 nd foot, connects the phototriode between 3 rd foot and the 4 th foot.
The utility model discloses a DCDC converter high level effectively forbids circuit further improves and lies in, and INH forbids the end and connects on emitting diode's positive pole through resistance R1, emitting diode's negative pole ground connection.
The utility model discloses an effective forbidding circuit of DCDC converter high level further improves and lies in, still inserts electric capacity C1, electric capacity C1's other end ground connection between INH forbids end and resistance R1.
The utility model discloses an effective forbidding circuit of DCDC converter high level further improves and lies in, and input voltage Vin connects between the collecting electrode of phototriode and triode Q1's base through resistance R2.
The utility model discloses a DCDC converter high level effectively forbids circuit further improves and lies in, and the projecting pole of phototriode and triode Q1's projecting pole all ground connection.
The utility model discloses an effective forbidding circuit of DCDC converter high level further improves and lies in, and the COMP pin of chip connects on triode Q1's collector through diode D1.
The utility model has the advantages that:
the utility model discloses a DCDC converter high level effectively forbids circuit, including INH forbids end, opto-coupler U1, input voltage Vin, triode Q1, the COMP pin of chip; one end of the optocoupler U1 is connected with an INH forbidden end, and the other end of the optocoupler U1 is connected with a triode Q1; an input voltage Vin is also connected between the optocoupler U1 and the triode Q1; the triode Q1 is connected with a COMP pin of the chip; the input voltage Vin is input into a high level, when the INH forbidden end is input into the high level, the optocoupler U1 is conducted, the triode Q1 is cut off, and the voltage of a COMP pin of the chip is normal; the input voltage Vin is input to a high level, when the INH forbidden 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 a COMP pin of the chip is pulled low. Through the utility model discloses a DCDC converter high level effectively forbids circuit, can realize the output of different level control DC/DC converters, and the circuit is simple reliable, has good using value.
Drawings
Fig. 1 is a schematic diagram of a high-level active disable circuit of the DCDC converter according to the present invention.
Detailed Description
For a more clear and complete description of the technical solution of the present invention, the following description is made with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a high-level active disable circuit for a DCDC converter, which includes an INH disable terminal, an optocoupler U1, an input voltage Vin, a transistor Q1, and a COMP pin of a chip;
one end of the optocoupler U1 is connected with an INH forbidden end, and the other end of the optocoupler U1 is connected with a triode Q1;
an input voltage Vin is also connected between the optocoupler U1 and the triode Q1;
the triode Q1 is connected with a COMP pin of the chip;
the input voltage Vin is input into a high level, when the INH forbidden end is input into the high level, the optocoupler U1 is conducted, the triode Q1 is cut off, and the voltage of a COMP pin of the chip is normal;
the input voltage Vin is input to a high level, when the INH forbidden 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 a COMP pin of the chip is pulled low.
Further, the optocoupler U1 includes 4 pins, wherein a light emitting diode is connected between the 1 st pin and the 2 nd pin, and a phototransistor is connected between the 3 rd pin and the 4 th pin.
Further, the INH disable terminal is connected to the anode of the led through a resistor R1, and the cathode of the led is grounded.
Further, a capacitor C1 is connected between the INH forbidden end and the resistor R1, and the other end of the capacitor C1 is grounded.
Further, the input voltage Vin is connected between the collector of the photo transistor and the base of the transistor Q1 through a resistor R2. The input voltage Vin is input to a high level through the resistor R2.
Further, the emitter of the phototransistor and the emitter of the transistor Q1 are both grounded.
Further, a COMP pin of the chip is connected to a collector of the transistor Q1 through a diode D1.
In this embodiment, the chip includes, but is not limited to, UCC28C43D, UCC2800 chips. The model of the optocoupler U1 is TLP293-GRH, and the model of the triode Q1 is MMBT 4401.
In the embodiment, an input voltage Vin is input with a high level, when an INH end inputs the high level (3.5V-6.5V), the INH end inputs an electric signal to an optocoupler U1 through a resistor R1 to drive a light emitting diode, so that the light emitting diode emits light which can be received by a photodetector, and a photocurrent is generated, the optocoupler U1 is turned on, a triode Q1 is in a cut-off state, and the voltage of a COMP pin of a chip is normal at the moment; either chip UCC28C43D or chip UCC2800 operates normally.
In this embodiment, when a low level (0V to 0.8V) is applied to the INH inhibition terminal, the optocoupler U1 is not turned on, Vin voltage is input to a high level through the resistor R2, the transistor Q1 is turned on, the voltage of the COMP pin of the chip UCC28C43D or the chip UCC2800 is pulled low, and the chip UCC28C43D or the chip UCC2800 is inhibited from operating; when the INH prohibition end is suspended, Vin voltage is input to high level through a resistor R2, an optocoupler U1 has no electrical signal input, an optocoupler U1 is not conducted, a triode Q1 is conducted, the voltage of a COMP pin of a chip UCC28C43D or a chip UCC2800 is pulled low, and the chip UCC28C43D or the chip UCC2800 is prohibited from working.
Through the utility model discloses an effective forbidding circuit of DCDC converter high level can realize the output of different level control DC/DC converters, and the circuit is simple reliable, can promote to using on chips such as UCC28C43D, UCC2800, has good using value.
Of course, the present invention can also have other various embodiments, and based on the embodiments, those skilled in the art can obtain other embodiments without any creative work, and all of them belong to the protection scope of the present invention.
Claims (7)
1. A DCDC converter high-level active inhibit circuit is characterized by comprising an INH inhibit end, an optocoupler U1, an input voltage Vin, a triode Q1 and a COMP pin of a chip;
one end of the optocoupler U1 is connected with an INH forbidden end, and the other end of the optocoupler U1 is connected with a triode Q1;
an input voltage Vin is also connected between the optocoupler U1 and the triode Q1;
the triode Q1 is connected with a COMP pin of the chip;
the input voltage Vin is input into a high level, when the INH forbidden end is input into the high level, the optocoupler U1 is conducted, the triode Q1 is cut off, and the voltage of a COMP pin of the chip is normal;
the input voltage Vin is input to a high level, when the INH forbidden 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 a COMP pin of the chip is pulled low.
2. The DCDC converter high-level active prohibition circuit according to claim 1, wherein the optocoupler U1 comprises 4 pins, wherein a light emitting diode is connected between the 1 st pin and the 2 nd pin, and a phototransistor is connected between the 3 rd pin and the 4 th pin.
3. The DCDC converter high-level active disable circuit of claim 2, wherein the INH disable terminal is connected to the anode of the led through a resistor R1, and the cathode of the led is grounded.
4. The active high disable circuit for DCDC converter of claim 3, wherein a capacitor C1 is further connected between INH disable terminal and resistor R1, and the other terminal of capacitor C1 is grounded.
5. The active high disable circuit for a DCDC converter as claimed in claim 2, wherein the input voltage Vin is coupled between the collector of the photo transistor and the base of the transistor Q1 through a resistor R2.
6. The DCDC converter active high disable circuit of claim 2, wherein the emitter of the phototransistor and the emitter of transistor Q1 are both coupled to ground.
7. The active high disable circuit for DCDC converter as claimed in claim 2, wherein the COMP pin of the chip is connected to the collector of the transistor Q1 through a diode D1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020212087632 | 2020-06-23 | ||
| CN202021208763 | 2020-06-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212992205U true CN212992205U (en) | 2021-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021507726.1U Active CN212992205U (en) | 2020-06-23 | 2020-07-23 | High-level effective inhibiting circuit of DCDC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212992205U (en) |
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2020
- 2020-07-23 CN CN202021507726.1U patent/CN212992205U/en active Active
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