Viper31 is the first integraptic semiconductor high voltage converter for large input voltages (85-265Vacs) that can output up to 18 watts of power in the flyback topology. Although recently, it has been applied to a popular metering system and multiple devices. Therefore, we expect the sales of more than 1 million in 2021. It is because of its 800 volt infrastructure MOSFET and advanced controller function, this positive response is caused. Indeed, benefited from its architecture, ViPer31 flexible, reliable, and efficient. Therefore, we must understand what this new high-voltage converter means for engineers.
New series introduction
The VIPER series covers a wide range of applications, as we have recently seen ViPer26k. The ViPerx1 series can be adjusted according to the inversion structure, including primary side and secondary side adjustment and buck. In short, traditionally we use this device to be applied in a non-optical coupling switching power supply (SMPS). The output power of ViPer01 is 4W, and the output power of ViPer11 is about 8W, so the ViPer31 of 18 W is a huge progress. The maximum on-resistance of new products is lower, only 3.5 Ω. In contrast, the on-resistance of ViPer01 is 30Ω, and the on-resistance of ViPer11 is 15 Ω. At present, there are 8 item numbers under the Viper31 series, and there will be more item numbers in the future. Viper317 has 710 mA drain current limit protection (IDLIM). Viper318's IDLIM is 850 mA, and ViPer319 can reach 990 mA. These versions are also X, L, and H models. X-type switching frequency jitter (FOSC) is 30 kHz ± 7%. The L-type FOSC is 60 kHz ± 7%, H-type 132 kHz ± 7%. Choosing the appropriate oscillator frequency (FOSC) allows engineers to choose a higher cost-effective EMI filter and reduce material costs.
Viper31: Flexibility
600 mAh buck topology
When an engineer selects a component, it usually needs to explain its principle. To outline a thinking process, it is not more simple than the way to show it in operation. Therefore, we launched a number of development boards, including Steval-VP319x1b. This platform has a high symbolic meaning because this is a buck converter for a load current (IOUT) for a load current (IOUT) for the first time. Experts know that it is difficult to achieve such a high load current through a high-pressure buck converter. Therefore, these developers highlight the characteristics of the device and demonstrate its advantage to engineers.
Cross-conversion error amplifier
Professionals may face another dilemma: how to prove the qualifications of new devices when their products are used by their products. For decision makers who lack technical knowledge, the upcoming StevAl-VP318L1F and SteVal-VP319x1b can help them. Viper31 has a cross-conversion error amplifier with a reference voltage of 1.2V ± 2%. Therefore, engineers can use this device instead of flyrt topology (with primary side regulation) and non-isolation flying (with DC resistance feedback). As mentioned earlier, Steval-VP319x1b implements a buck converter, while StevAl-VP318L1F is a flyback converter with secondary side adjustment, which is ideal for applications in air conditioners. Finally, Steval-VP318L2F is a 18-tile separation flyback with a primary side adjusted. Therefore, its error amplifier allows ViPer31 to handle the most common topologies so that a series of devices apply to a variety of products.
Input voltage range
ODMS develops a design in a country, then exports to all parts of the world, this is more and more common. Therefore, engineers must indicate that they consider international standards. Unfortunately, most of the high voltage converters in the industry is narrow. Therefore, by pointing out that its input voltage ranges from 85 volts to 265 volts, the engineer can explain the reasons for choosing ViPer31. Designers may also need to overcome the intrinsic complexity of specific applications. Intelligent instruments, smart home systems, air conditioning units or emergency lighting networks are facing a special challenge. They must handle power loss, which forces them to use universal power. In this case, even if the input voltage is lowered, the final product must work properly. Therefore, the engineer is pleased to find that the source voltage of ViPer31 is only 24V. In addition, we ensure that these features are easy to prove. Professionals can use upcoming Steval-VP319x1b, replace capacitance C1 and C2, and then enjoy a lower nominal input start voltage.
Viper31: Stability and Validity
Undervoltage and overvoltage protection
Consumers are increasingly attaching to the safety and stability of the product. Therefore, teams often think about how power devices make them more reliable. For example, engineers who want to make air-conditioning are very sensitive to these issues because faults will cause high human cost. Designers also know that their company is more likely to accept ViPer31's undervoltage (UVP) and overvoltage protection (OVP). Since each board has a dedicated pin, the UVP pin can be used to disable the IC or the entire SMPS, and the internal threshold is usually 0.4V. Ovp allows the pulse width modulator to remain disabled even after automatic restart, and only resumes turn-on only after the OVP condition is faded. Viper31 is also equipped with overload protection and thermal shutdown. The pin used in our SSOP10 package is more than ViPer01 and Viper11 SSOP10, which explains the reasons.
Better, fewer external components
Engineers are also working hard to solve cost problems because components will produce many direct and indirect consequences. The price of the part itself is a key factor in the equation. However, a high voltage converter will determine which active and passive components will affect the entire BOM. Therefore, when the designer tries to illustrate the reasons for selecting ViPer31, it is usually pointed out of its pulse jumping characteristics, which makes them select smaller inductance while protecting the magnetic component is not affected by the current peak. Similarly, models with different oscillator frequencies will ensure that EMI filters with a cost-effectiveness in the design. Now the current limit of Viper31 is accurate enough, no need to reuse external components.
Welcome low-power MCU and energy saving system
The cost consideration is increasingly complex due to consumers' awareness of consumers. Buyers are more concerned about the purchase of environment and their public facilities. The best way to meet these needs is to choose components that are suitable for low power systems. For example, the error amplifier reference voltage of ViPer31 is 1.2V, which can easily generate a 3.3V voltage for the MCU. The static current of the semiconductor converter is also less than 350μA, so power consumption in standby is only 10mW. Therefore, engineers can feel proud that even under the tight conditions, their design can also save energy consumption.
Editor: lq, read full article, original title: viper31: 3 answers to solve new engineering challenges
Article Source: [Micro Signal: STM_IPGCHINA, WeChat public number: STM32 single-chip microcomputer] Welcome to add attention! Please indicate the source of the article.
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