CN213342009U - Anti-interference circuit based on voltage conversion chip - Google Patents
Anti-interference circuit based on voltage conversion chip Download PDFInfo
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- CN213342009U CN213342009U CN202022481668.6U CN202022481668U CN213342009U CN 213342009 U CN213342009 U CN 213342009U CN 202022481668 U CN202022481668 U CN 202022481668U CN 213342009 U CN213342009 U CN 213342009U
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Abstract
The utility model discloses an anti-jamming circuit based on voltage conversion chip, it includes voltage conversion chip N1, direct current input positive terminal is connected the back through the VIN pin of first inductance L1 with voltage conversion chip N1, has connect first electric capacity C1 with direct current input negative terminal between, direct current input negative terminal and voltage conversion chip N1's PGND pin are connected; a first resistor R1 is connected between a VDR pin and a PGD pin of the voltage conversion chip N1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4 are respectively connected among a TRK pin, a COMP pin, an EAO pin and an SGND pin, a LGH pin, an ISN pin, an ISP pin and a VSP pin are all connected with the SGND pin, the VSN pin is connected with a VDIFF pin, and a fifth capacitor C5 is connected between a VOUT pin and the PGND pin; the pin VOUT and the pin PGND are respectively connected with a positive direct current output terminal and a negative direct current output terminal. The utility model discloses can satisfy and start the heavy current demand in the twinkling of an eye, guarantee low ripple design demand.
Description
Technical Field
The utility model belongs to the technical field of the power technology and specifically relates to an anti-jamming circuit based on voltage conversion chip is related to.
Background
Under the trend of miniaturization of a power supply and high requirement on output ripple, the voltage conversion chip PI3740-00-LGIZ is frequently used, and low ripple design is needed to meet the requirement of output ripple. When the ripple is low, the capacitance value of the output filter capacitor needs to be increased to realize the low ripple design, but the current required at the starting moment of the chip is too large, and the original use parameters of the TRK pin of the original voltage conversion chip PI3740-00-LGIZ are not enough to provide enough current at the starting moment to meet the requirement.
Disclosure of Invention
In order to solve the above problem, the present invention provides an anti-jamming circuit based on voltage conversion chip, which can ensure the design requirement of low ripple by adjusting the TRK pin of voltage conversion chip PI3740-00-LGIZ and the capacitance value of SGND pin to realize the start-up problem of low ripple design.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an anti-interference circuit based on a voltage conversion chip comprises a voltage conversion chip N1, wherein a direct current input positive terminal is connected with a VIN pin of a voltage conversion chip N1 through a first inductor L1, a first capacitor C1 is connected between the direct current input positive terminal and a direct current input negative terminal, and the direct current input negative terminal is connected with a PGND pin of the voltage conversion chip N1; a first resistor R1 is connected between a VDR pin and a PGD pin of the voltage conversion chip N1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4 are respectively connected among a TRK pin, a COMP pin, an EAO pin and an SGND pin, a LGH pin, an ISN pin, an ISP pin and a VSP pin are all connected with the SGND pin, the VSN pin is connected with a VDIFF pin, and a fifth capacitor C5 is connected between a VOUT pin and the PGND pin; the pin VOUT and the pin PGND are respectively connected with a positive direct current output terminal and a negative direct current output terminal.
Due to the adoption of the technical scheme, the utility model discloses have following superiority:
the anti-interference circuit based on the voltage conversion chip is optimized by changing the capacitance values of the second capacitor and the fifth capacitor, the capacitance value of the fifth capacitor needs to be increased in low-ripple design, and capacitance values of a TRK pin and an SGND pin of a PI3740-00-LGIZ voltage conversion chip need to be increased to meet the requirement of large current at the moment of starting, so that the anti-interference circuit has a wide application prospect in the field of power supply application.
Drawings
Fig. 1 is a schematic diagram of the anti-jamming circuit based on the voltage conversion chip of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the anti-interference circuit based on the voltage conversion chip includes a voltage conversion chip N1, a dc input positive terminal is connected to a VIN pin (power input positive) of the voltage conversion chip N1 through a first inductor L1, and then a first capacitor C1 is connected between the dc input negative terminal and the dc input positive terminal, and the dc input negative terminal is connected to a PGND pin (power ground) of the voltage conversion chip N1; a first resistor R1 is connected between a VDR pin (an internal 5.1V auxiliary source) and a PGD pin (fault indication) of the voltage conversion chip N1, a second inductor L2 is connected between a VS1 pin (a power input side switch and ZVS detection) and a VS2 pin (a power output side switch and ZVS detection), a TRK pin (soft start and input tracking), a COMP pin (error amplifier compensation), a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a LGH pin (constant current amplifier input), an ISN pin (high side current sensing amplifier input negative), an ISP pin (high side current sensing amplifier input positive), a VSP pin (general amplifier non-inverting input) are respectively connected with an SGND pin (signal ground), a VSN pin (general amplifier inverting input) is connected with a VDIFF pin (general amplifier output), a fifth capacitor C5 is connected between the VOUT pin (positive power supply output) and the PGND pin (power ground); the pin VOUT (positive power supply output) and the pin PGND (ground power supply) are respectively connected with a positive direct current output terminal and a negative direct current output terminal.
The TRK pin is a soft start and input detection pin of the voltage conversion chip PI3740-00-LGIZ, and a capacitor is connected between the TRK pin and the SGND pin to enable the voltage conversion chip to start slowly, so that the phenomenon that the voltage conversion chip cannot start due to overlarge current required by a load is avoided.
In practical use, in order to meet the requirement of output ripple, a low ripple design is required, and a capacitor of more than 470 μ F is often added between the VOUT pin and the PGND pin of the chip. Thus, 47nF between the TRK pin and the SGND pin lengthens the start-up time, but is insufficient to meet the current requirements of the load. Therefore, the capacitance between the TRK pin and the SGND pin needs to be increased according to the increase of the load capacitance. That is, the capacitance of the second capacitor C2 needs to change (increase) with the change of the fifth capacitor C5.
The matching relationship between the second capacitor and the fifth capacitor in practical application is shown in table 1.
TABLE 1 second C2 and fifth C5 capacitors parameter matching relationship table
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. An anti-jamming circuit based on voltage conversion chip, characterized by: the direct current conversion circuit comprises a voltage conversion chip N1, wherein a direct current input positive end is connected with a VIN pin of a voltage conversion chip N1 through a first inductor L1, a first capacitor C1 is connected between the direct current input positive end and a direct current input negative end, and the direct current input negative end is connected with a PGND pin of the voltage conversion chip N1; a first resistor R1 is connected between a VDR pin and a PGD pin of the voltage conversion chip N1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4 are respectively connected among a TRK pin, a COMP pin, an EAO pin and an SGND pin, a LGH pin, an ISN pin, an ISP pin and a VSP pin are all connected with the SGND pin, the VSN pin is connected with a VDIFF pin, and a fifth capacitor C5 is connected between a VOUT pin and the PGND pin; the pin VOUT and the pin PGND are respectively connected with a positive direct current output terminal and a negative direct current output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022481668.6U CN213342009U (en) | 2020-10-30 | 2020-10-30 | Anti-interference circuit based on voltage conversion chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022481668.6U CN213342009U (en) | 2020-10-30 | 2020-10-30 | Anti-interference circuit based on voltage conversion chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213342009U true CN213342009U (en) | 2021-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022481668.6U Active CN213342009U (en) | 2020-10-30 | 2020-10-30 | Anti-interference circuit based on voltage conversion chip |
Country Status (1)
| Country | Link |
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| CN (1) | CN213342009U (en) |
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2020
- 2020-10-30 CN CN202022481668.6U patent/CN213342009U/en active Active
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