• SI1211SI1211


SI1211 is an AC high-voltage AC linear LDO constant voltage chip with a compact inductorless design.

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Product Description

Off-line, inductorless AC input linear regulator

The SI1211 is a compact, off-line linear voltage regulator with a non-inductive design. By adjusting the SEL pin resistance, the AS3310 can obtain a 5V/3.3V second gear output voltage. The SI1211 is a simple and reliable off-line power supply solution for offset power supply.

SI1211 integrates 650V power MOSFET, start control circuit, VDD voltage control circuit, AC signal synchronous detection circuit, low voltage difference regulator, etc. The chip intelligently controls the AC energy input to reduce the system loss, improve the system efficiency, and effectively reduce the system standby.

The SI1211 integrates complete protection functions with self-recovery: VDD undervoltage protection, VDD overvoltage protection, output overload protection, output undervoltage protection, lightning surge protection and built-in overtemperature protection.

Main feature

• High precision output voltage: 2%

• Output adjustable: 5V/3.3V

• Optimize the control mode to improve efficiency

• Wide input voltage range: 80~305VAC

• No power inductance required

• No high voltage capacitor is required

• Few devices, low cost

• Fast dynamic response

• Output short-circuit protection

• Output undervoltage protection

• Output overload protection

• Built-in overheat protection

• Encapsulation type SOP-8

Typical application

• Power supply for small household appliances

• Wall switches and dimmers

Contact Us

Shenzhen Headquarters: 10th Floor, Research and Development Center Building, EVOC Industrial Park, 

Guangming Street, Guangming District, Shenzhen City, Guangdong Province, China

Company Official Website:



Telephone: +86-18681585060


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