CN217693082U - Negative voltage generation circuit applied to professional sound card - Google Patents
Negative voltage generation circuit applied to professional sound card Download PDFInfo
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- CN217693082U CN217693082U CN202221370902.0U CN202221370902U CN217693082U CN 217693082 U CN217693082 U CN 217693082U CN 202221370902 U CN202221370902 U CN 202221370902U CN 217693082 U CN217693082 U CN 217693082U
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Abstract
The utility model relates to a negative pressure generating circuit applied to a professional sound card, which comprises a control chip, wherein the IN of the control chip is connected with a VBUS wire, and the VBUS is grounded through a C106; the EN pin is connected with a VBUS wire through R105; the GND pin is grounded through D91 and is connected with a terminal T; the BST pin is connected with the SW pin through a C105, and the SW pin is grounded through an L92; c114, C113 and E91 are connected IN parallel between the IN pin and the GND pin; the FB pin is respectively connected with the negative electrodes of the resistor R107, the resistor R110 and the polarity capacitor E93, the other end of the resistor R107 is grounded, the positive electrode of the polarity capacitor E93 is grounded through a resistor R118, and the other end of the resistor R110 is connected with the GND pin; a capacitor C115, a polarity capacitor E92, and a capacitor C116 are connected in parallel between the GND pin and the other end of the reactance L92. The device can continuously generate negative pressure, and keeps the stable output level of the negative pressure.
Description
Technical Field
The application belongs to the technical field of negative voltage generating circuits, and particularly relates to a negative voltage generating circuit applied to a professional sound card.
Background
The DC/DC chip mainly ensures the stability of the output voltage through the comparison of the feedback voltage and the internal reference voltage. The official recommended circuit or basic application circuit is shown in fig. 1, and has pins or elements such as Vin, cin, vout, cout, R1, R2, etc., the circuit in fig. 1 can only step down, but cannot generate negative voltage, so that the noise of the circuit is large, and the application in a high-end professional sound card is severely limited. In view of this, it is necessary to develop a DC-DC circuit that can stably output a negative voltage and can be applied to a high-end professional sound card.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve provides a be applied to the negative pressure production circuit in the professional sound card, uses domestic DCDC chip can realize a negative pressure production circuit small, stable and the ultralow noise of signal to can use in high-end professional sound card.
In order to solve the above problem, the utility model discloses the technical scheme who adopts is:
a negative pressure generating circuit applied to a professional sound card comprises a control chip, wherein the control chip comprises an IN pin, an EN pin, a BST pin, an SW pin, an FB pin and a GND pin,
the IN pin is connected with a VBUS wire, and the VBUS wire is grounded through a capacitor C106;
the EN pin is connected with a VBUS wire through a resistor R105;
the GND pin is grounded through a diode D91, and is connected with a terminal T;
the BST pin is connected with the SW pin through a capacitor C105, and the SW pin is grounded through a reactance L92;
a capacitor C114, a capacitor C113 and a polar capacitor E91 are connected IN parallel between the IN pin and the GND pin;
the FB pin is respectively connected with the negative electrodes of the resistor R107, the resistor R110 and the polar capacitor E93, the other end of the resistor R107 is grounded, the positive electrode of the polar capacitor E93 is grounded through a resistor R118, and the other end of the resistor R110 is connected with the GND pin; a capacitor C115, a polarity capacitor E92, and a capacitor C116 are connected in parallel between the GND pin and the other end of the reactance L92.
The utility model discloses technical scheme's further improvement lies in: the diode D91 is a clamp diode.
The utility model discloses technical scheme's further improvement lies in: diode D91 is model B5819W.
The utility model discloses technical scheme's further improvement lies in: resistor R118 is 10K omega.
The utility model discloses technical scheme's further improvement lies in: the control chip is BL8032S or STI3470 or TMI3281.
Since the technical scheme is used, the utility model discloses the beneficial effect who gains is:
the device can realize a negative pressure generating circuit with small volume, stable signal and ultra-low noise by using a domestic DCDC chip, can be applied to high-end professional sound cards and has extremely high popularization and application values.
Drawings
FIG. 1 is a circuit diagram of a basic application circuit;
FIG. 2 is a circuit diagram of the present invention;
fig. 3 is the utility model discloses an actual measurement effect picture.
Detailed Description
The present invention will be described in further detail with reference to examples.
The utility model discloses a be applied to negative pressure production circuit IN professional sound card, see fig. 2-fig. 3, including control chip, the control chip model is BL8032S or STI3470 or TMI3281, and fig. 2 explains for TMI3281 with control chip, and control chip includes IN foot, EN foot, BST foot, SW foot, FB foot, GND foot, can also increase some with the pin certainly, as long as can satisfy these six pin wiring can. Wherein the content of the first and second substances,
the IN pin is connected with a VBUS wire, and the VBUS wire is grounded through a capacitor C106;
the EN pin is connected with a VBUS wire through a resistor R105;
the GND pin is grounded through a diode D91, and is connected with a terminal T;
the BST pin is connected with the SW pin through a capacitor C105, and the SW pin is grounded through a reactance L92;
a capacitor C114, a capacitor C113 and a polar capacitor E91 are connected IN parallel between the IN pin and the GND pin;
the FB pin is respectively connected with the negative electrodes of the resistor R107, the resistor R110 and the polar capacitor E93, the other end of the resistor R107 is grounded, the positive electrode of the polar capacitor E93 is grounded through a resistor R118, and the other end of the resistor R110 is connected with the GND pin; and a capacitor C115, a polarity capacitor E92 and a capacitor C116 are also connected in parallel between the GND pin and the other end of the reactance L92.
The diode D91 is a clamp diode, which ensures the stability of the signal.
In fig. 2, the diode D91 is of type B5819W.
The resistor R118 is 10K omega, and the models of the other components such as resistors, reactances, diodes and the like are shown in FIG. 2.
In FIG. 2, the control foot flags are as follows:
1. the EN enable pin, typically high, enables the chip to operate.
2. IN power supply input
3. The BST self-lifting presser foot is provided with a base plate,
4. SW switch control pin
5. FB output voltage feedback pin
6. The GND pin is grounded.
Like fig. 3, for the utility model discloses an actual measurement effect picture, the actual measurement of Ap555 audio analyzer for the circuit can know, can realize ultralow noise effect picture. The left INSTANTANEOUS LEVEL is the INSTANTANEOUS LEVEL, and the line is kept very stable; the right side is the noise level value actually tested, the negative pressure can be continuously generated from-90 to-140 or below, the stable output level of the negative pressure is maintained, and other DCDCDCDC are generally rated at about-70 dB, so that the noise level of the circuit is greatly improved.
Claims (5)
1. A negative voltage generating circuit applied to a professional sound card is characterized in that: comprises a control chip, the control chip comprises an IN pin, an EN pin, a BST pin, an SW pin, an FB pin and a GND pin, wherein,
the IN pin is connected with a VBUS wire which is grounded through a capacitor C106;
the EN pin is connected with a VBUS wire through a resistor R105;
the GND pin is grounded through a diode D91, and is connected with a terminal T;
the BST pin is connected with the SW pin through a capacitor C105, and the SW pin is grounded through a reactance L92;
a capacitor C114, a capacitor C113 and a polarity capacitor E91 are connected IN parallel between the IN pin and the GND pin;
the FB pin is respectively connected with the negative electrodes of the resistor R107, the resistor R110 and the polar capacitor E93, the other end of the resistor R107 is grounded, the positive electrode of the polar capacitor E93 is grounded through a resistor R118, and the other end of the resistor R110 is connected with the GND pin; and a capacitor C115, a polarity capacitor E92 and a capacitor C116 are also connected in parallel between the GND pin and the other end of the reactance L92.
2. The negative voltage generating circuit applied to professional sound cards according to claim 1, wherein: the diode D91 is a clamp diode.
3. The negative voltage generating circuit applied to the professional sound card according to claim 2, wherein: diode D91 is type B5819W.
4. The negative voltage generating circuit applied to the professional sound card according to claim 3, wherein: resistor R118 is 10K omega.
5. The negative voltage generating circuit applied to professional sound cards according to claim 4, wherein: the control chip is BL8032S or STI3470 or TMI3281.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221370902.0U CN217693082U (en) | 2022-06-02 | 2022-06-02 | Negative voltage generation circuit applied to professional sound card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221370902.0U CN217693082U (en) | 2022-06-02 | 2022-06-02 | Negative voltage generation circuit applied to professional sound card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217693082U true CN217693082U (en) | 2022-10-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221370902.0U Active CN217693082U (en) | 2022-06-02 | 2022-06-02 | Negative voltage generation circuit applied to professional sound card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217693082U (en) |
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2022
- 2022-06-02 CN CN202221370902.0U patent/CN217693082U/en active Active
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