In the field of small household appliances, power modules are mostly output in the form of DC "18V+5V" or DC "12V+5V". The traditional power supply scheme (such as SM7012) adopts the BUCK topology plus the feedback regulation of the voltage regulator tube. This structure has the problems of more components and inconvenient material control, which makes the whole production cost higher.
In 2012, the SM7055 series of innovative switching power supply control ICs was introduced. The SM7055 highly integrates the system feedback adjustment components into the chip, streamlining the system's peripheral components, improving system reliability, and reducing system production and management costs.
I. Introduction to SM7055
SM7055 is a power switch chip adopting current mode PWM control mode. It integrates high voltage start circuit and high voltage power tube. It can be widely used in BUCK, BUCK-BOOST and flyback system solutions, with over temperature, over current, over voltage, under voltage, etc. The perfect protection function ensures the reliability of the system.
SM7055 can be widely used in small appliances such as induction cookers, rice cookers, electric pressure cookers, and standby power supplies for electrical equipment.
Second, the typical application program (induction cooker)
2.1 circuit schematic
SM7055 Induction Cooker Power Solution
Compared with the traditional induction cooker power supply scheme, the SM7055 induction cooker solution does not require the FB feedback loop, which not only saves two components, but also improves reliability, while reducing BOM cost and material control cost in the production process.
2.2 Physical map
SM7055 induction cooker power supply scheme physical map
For the VIPer12 chip induction cooker power solution, the SM7055 directly replaces the original solution without changing the PCB trace and without disassembling the feedback loop components.
2.3 Specifications
Third, the SM7055 series overview
According to different power applications, the SM7055 series control chip is introduced. A brief comparison of this series of chips is as follows:
Fourth, SM7055 series chip package type summary
Depending on the output power and the size of the different models, chips in different package formats can be selected during the production process.
summary
The SM7055 does not require a feedback loop, increasing integration and system reliability. At the same time, the frequency-hopping and intelligent soft-drive technology is adopted to further optimize the EMC performance. The external "EN" pin can be used to realize the voltage output of 12V or 18V.
The SM7055 series of products can be widely used in applications such as power supply for small appliances and standby power for electrical equipment.
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