Non-isolated DC / DC power supply module

Abstract

The utility model relates to the technical field of power supply modules, and discloses a non-isolated DC / DC power supply module, which comprises an input voltage pin VIN, the input voltage pin VIN is connected with a power supply for a converter, a capacitor is connected between the input voltage pin VIN and an output voltage pin VOUT, a module ground GND is connected with a frequency setting pin RFREQ, and the frequency setting pin RFREQ is connected with the converter. The output voltage pin VOUT is connected with the normal output indication pin PGOOD in the module, the output voltage pin VOUT is connected with the feedback pin FB, and the resistor RFB is connected between the output voltage pin VOUT and the feedback pin FB, so that stable output voltage is provided through effective application of the module; the power supply has multiple protection characteristics such as over-current protection, short-circuit protection, under-voltage protection, input under-voltage locking protection, over-temperature turn-off protection and the like, remote enabling control can be realized by using an EN pin, a PGOOD pin can provide normal output indication of a power supply, and an FB pin can flexibly adjust output voltage.

Description

Technical Field

[0001] The utility model relates to the technical field of control cabinets, and more particularly to a non-isolated DC / DC power supply module. Background Art

[0002] A power module is a power supply that can be mounted directly on a printed circuit board. It comes in both step-down and step-up configurations and can power application-specific integrated circuits (ASICs), digital signal processors (DSPs), microprocessors, memories, field-programmable gate arrays (FPGAs), and other digital or analog loads. However, existing DC / DC power modules are slow to adjust their voltage ranges, so I propose a non-isolated DC / DC power module. Utility Model Content

[0003] In order to solve the problems raised in the above background technology, the present invention provides a non-isolated DC / DC power supply module.

[0004] The utility model provides a non-isolated DC / DC power supply module adopts the following technical solution: a non-isolated DC / DC power supply module, including a frequency setting pin RFREQ, a power good output indication pin PGOOD, a feedback pin FB, an output voltage pin VOUT, a module ground GND, and an input voltage pin VIN,

[0005] The input voltage pin VIN is connected to power the converter, an external bypass capacitor is connected between the input voltage pin VIN and the module ground GND, the output voltage pin VOUT is also connected to the output load, a capacitor is connected between the input voltage pin VIN and the output voltage pin VOUT, the module ground GND is connected to the frequency setting pin RFREQ, the output voltage pin VOUT is connected to the normal output indication pin PGOOD in the module, the output voltage pin VOUT is connected to the feedback pin FB and a resistor RFB is connected between the two connections.

[0006] Preferably, the frequency setting pin RFREQ cannot be left floating.

[0007] Preferably, there are two resistors connected between the output voltage pin VOUT and the feedback pin FB. When the output voltage is less than 3.3V, an external resistor RFB1 is connected between the output voltage pin VOUT and the feedback pin FB; when the output voltage is greater than 3.3V, another resistor RFB2 is connected between the output voltage pin VOUT and the feedback pin FB.

[0008] Preferably, the output voltage pin VOUT is connected to the module's internal power inductor and output capacitor. Preferably, all the module grounds GND are connected together.

[0009] Preferably, an enable pin EN is also included.

[0010] In summary, the present invention has the following beneficial technical effects:

[0011] 1. This utility model provides a stable output voltage through the effective application of the module. It also has multiple protection features such as overcurrent protection, short circuit protection, undervoltage protection, input undervoltage lockout protection, and overtemperature shutdown protection. The EN pin can be used to achieve remote enable control, the PGOOD pin can provide a normal power output indication, and the FB pin can flexibly adjust the output voltage.

[0012] 2. This utility model uses an external resistor between the enable pin EN and the module ground GND to achieve a higher equivalent undervoltage lockout protection (UVLO) threshold. The resistance value of an external resistor is calculated by a formula between the enable pin EN and the module ground GND, and different resistors can be calculated according to actual conditions to achieve the calculation of the resistance value suitable for different situations of the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of a typical application circuit with 1.0V output in an embodiment of the present utility model;

[0014] Figure 2 This is a schematic diagram of a typical application circuit with 1.8V output in an embodiment of the present utility model;

[0015] Figure 3 This is a schematic diagram of a typical application circuit of 2.5V output in an embodiment of the present utility model;

[0016] Figure 4 This is a schematic diagram of a typical application circuit of 3.3V output in an embodiment of the present utility model;

[0017] Figure 5 This is a schematic diagram of a typical application circuit of 5V output in an embodiment of the present utility model;

[0018] Figure 6 This is a schematic diagram of a typical application circuit of 12V output in an embodiment of the present utility model;

[0019] Figure 7 Schematic diagram of the adjustable undervoltage lockout protection structure of the external resistor in the embodiment of the present utility model. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-7 The utility model is described in further detail.

[0021] It should be noted that the drawings are schematic and not drawn to scale. For clarity and convenience, the relative sizes and proportions of parts shown in the drawings may be exaggerated or reduced in size. Any dimensions are illustrative only and are not intended to be limiting. Identical structures, elements, or components appearing in two or more drawings are denoted by the same reference numerals to indicate similar features.

[0022] The present invention discloses a non-isolated DC / DC power supply module. Figure 1-7 , a non-isolated DC / DC power module that can deliver 5A of continuous output current from an input voltage range of 4.5V to 36V at an ambient temperature of -55°C to +125°C. The module provides a default output voltage of 3.3V and can be adjusted to 1.0-12.0V using an external voltage divider resistor;

[0023] The module integrates a controller, power switch tube, inductor, appropriate input and output capacitors and all supporting components in an LGA-18 (12mmx12mmx4.2mm) package.

[0024] Including frequency setting pin RFREQ, power normal output indication pin PGOOD, feedback pin FB, output voltage pin VOUT, module ground GND, input voltage pin VIN;

[0025] The input voltage pin VIN is connected to power the converter. The input voltage pin VIN is connected to the input power supply. An external bypass capacitor is connected between the input voltage pin VIN and the module ground GND. An external bypass capacitor is connected between the input voltage pin VIN and the output voltage pin VOUT. The output voltage pin VOUT is connected to the power inductor and output capacitor inside the module. The output voltage pin VOUT is also connected to the output load. The module ground GND is connected to the frequency setting pin RFREQ, which cannot be left floating. All the module ground GNDs are connected together to form the module ground plane. The output voltage pin VOUT is connected to the normal output indication pin PGOOD within the module. The output voltage pin VOUT is connected to the feedback pin FB, and a resistor RFB is connected between the two connections. Two resistors are connected between the output voltage pin VOUT and the feedback pin FB. When the output voltage is less than 3.3V, an external resistor RFB1 is connected between the output voltage pin VOUT and the feedback pin FB. When the output voltage is greater than 3.3V, another resistor RFB2 is connected between the output voltage pin VOUT and the feedback pin FB.

[0026] The enable pin EN is connected to the VIN pin through the module pull-up resistor and is used to turn the module on or off. The module is enabled by driving the enable pin EN to a high level, and vice versa, the module is turned off by driving it to a low level.

[0027] The module includes over-current protection (OCP) and short-circuit protection (SCP), under-voltage protection (UVP), input under-voltage lockout (UVLO) protection, and over-temperature shutdown protection;

[0028] Overcurrent protection (OCP) and short-circuit protection (SCP): The module has an internal current limit. Once the internal inductor current exceeds the current limit, the switch will stop working and the overcurrent protection (OCP) timer will start. The overcurrent protection (OCP) time is 100μs. If the current limit is reached in each cycle within this 100μs limit, the short-circuit protection (SCP) will be triggered.

[0029] Undervoltage protection (UVP): The module detects output undervoltage conditions by monitoring the VFB pin. If VFB drops below 50% of VREF, the undervoltage protection (UVP) is triggered, and the current limit protection triggers the short circuit protection (SCP).

[0030] (Refer to Figure 7 The module has an input undervoltage lockout (UVLO) protection function to achieve stable output power. Its turn-on threshold is 4.0V and its hysteresis is 900mV. When the supply voltage exceeds the undervoltage lockout protection (UVLO) turn-on threshold, the module starts. When the supply voltage is lower than the undervoltage lockout protection (UVLO) turn-off threshold voltage, the module shuts down. An external resistor can be used between the enable pin EN and the module ground GND to achieve a higher equivalent undervoltage lockout protection (UVLO) threshold;

[0031] Use an external resistor between the enable pin EN and the module ground GND with the value of:

[0032]

[0033] The resistance value is calculated, and different resistances can be calculated according to actual conditions to achieve the calculation of resistance values ​​for different situations in which the module is applicable;

[0034] Overtemperature shutdown protection: The module implements overtemperature protection by monitoring the internal IC junction temperature. This feature disables the module if the temperature is too high. If the junction temperature exceeds a threshold (175°C), the entire chip shuts down. This protection is non-latching and has approximately 45°C of thermal hysteresis. Once the junction temperature drops to approximately 130°C, the module resumes operation through soft-start.

[0035] The module is tested under the condition of V IN =24V,C OUT=22μFT J =-55℃ to +125℃, the results are as follows:

[0036]

[0037]

[0038]

[0039]

[0040]

[0041] Specifically, the module's effective application provides a stable output voltage and features multiple protection features, including overcurrent protection, short-circuit protection, undervoltage protection, input undervoltage lockout protection, and overtemperature shutdown protection. Furthermore, the EN pin allows for remote enable control, the PGOOD pin provides a power-good output indication, and the FB pin allows for flexible adjustment of the output voltage.

[0042] Finally, a few points should be explained: First, in the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0043] Secondly: The drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.

[0044] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A non-isolated DC / DC power supply module, characterized in that: Including frequency setting pin RFREQ, power normal output indication pin PGOOD, feedback pin FB, output voltage pin VOUT, module ground GND, input voltage pin VIN, The input voltage pin VIN is connected to power the converter, an external bypass capacitor is connected between the input voltage pin VIN and the module ground GND, the output voltage pin VOUT is also connected to an output load, a capacitor is connected between the input voltage pin VIN and the output voltage pin VOUT, the module ground GND is connected to the frequency setting pin RFREQ, the output voltage pin VOUT is connected to the normal output indication pin PGOOD within the module, the output voltage pin VOUT is connected to the feedback pin FB, and a resistor RFB is connected between the two connections.

2. The non-isolated DC / DC power supply module according to claim 1, wherein: The frequency setting pin RFREQ cannot be left floating.

3. The non-isolated DC / DC power supply module according to claim 1, wherein: There are two resistors connected between the output voltage pin VOUT and the feedback pin FB. When the output voltage is less than 3.3V, an external resistor RFB1 is connected between the output voltage pin VOUT and the feedback pin FB; when the output voltage is greater than 3.3V, another resistor RFB2 is connected between the output voltage pin VOUT and the feedback pin FB.

4. The non-isolated DC / DC power supply module according to claim 1, wherein: The output voltage pin VOUT is connected to the module's internal power inductor and output capacitor.

5. The non-isolated DC / DC power supply module according to claim 1, wherein: All the module grounds GND are connected together.

6. The non-isolated DC / DC power supply module according to claim 1, wherein: An enable pin EN is also included.

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