VIPER12AS datasheet, circuit diagram & pinout

VIPER12A Pinout Equivalent

viper12a pinout Picture

VIPER12A is a non-isolated switching power IC that integrates high-voltage MOSFET driver and PWM controller. It is widely used in low-power switching power supply, mobile phone computer charger and other scenarios that need to be converted from AC to DC. The biggest advantage of VIPER12A is its low cost and high integration, which does not require a very complex peripheral circuit design, making it the first choice for many low-power power supply designs. This article will introduce the pin function of VIPER12A, specific parameters and optional alternative models to help readers better understand and use the chip for circuit design.
VIPER12A basic features and parameters:
Type: non-isolated switching power supply;
Main driver: PWM+MOSFET;
Input voltage range: chip supply voltage is 9~38V, convertible AC voltage is 85~256Vac;
Output power: When the AC input is 85~256Vac, the SOP-8 package is up to 5W; DIP-8 packages up to 8W;
Switching frequency: 60Khz;
Package as: SOP-8 or DIP-8;

VIPER12A pin menu (using SOP-8 as an example) :

Alternative chip table for VIPER12A:

Picture	Name	Type	Operating Voltage	Transistor Withstand Voltage	Switching Frequency	Package
	VIPER12ASTR-E	non-isolated	9V~38V	730V	60kHz	SOIC-8
	VIPER22AS	non-isolated	10V~35V	800V	65kHz	SOP-8
	VIPER12AS	non-isolated	10V~35V	800V	43kHz	SOP-8
	VIPER17LN	non-isolated	8.5V~23.5V	800V	60kHz	DIP-7
	SS8201	non-isolated	3.3V~24V	800V	40kHz	SOP-8

Note:

Feedback circuit design: Ensure that the device selection of the feedback circuit meets the requirements of the data manual, and pay attention to the feedback loop not to cross with other wiring when PCB layout;
EMI design: In order to pass EMI detection, it is recommended to add EMI filtering circuit in the design;
Heat dissipation: In high load work, a lot of heat will be generated, and heat dissipation is essential.