Introduction of VIPER22A IC
VIPER22A, a popular SMPS controller IC from STMicroelectronics, has been extensively employed in AC to DC Converters in off-line power circuit designs. It consists of an integrated PWM controller and a power MOSFET. The MOSFET connects to the primary side of a power transformer. When switched, it will produce the required voltage.
Today, easybom will introduce the details about the IC VIPER22A. This article will be divided into below parts: VIPER22A Datasheet, VIPER22A IC Pinout, VIPER22A Circuit, VIPER22A Equivalent, and so on.
Features of VIPER22A IC
Convert AC to DC
Operating Voltage: 9V – 38V
Oscillator Frequency: 60 kHz usually
Mosfet Drain to the Source Voltage: 730V
Off-state drain current: 0.1mA
Rise time and fall time 50ns and respectively 100ns
VIPER22A IC Pinout
Below is the VIPER22A IC Pinout:
| Pin | Name of Pin | Description |
| 1,2 | Source | Source pin of the switching MOSFET |
| 3 | Feedback (FB) | Feedback for the SMPS circuit |
| 4 | VDD | Vdd voltage 9V to 38V |
| 5,6,7,8 | Drain | Drain pin of the switching MOSFET |
Specifications of IC VIPER22A
Physical
Package / Case – 8-SOIC (0.154, 3.90mm Width)
Technical
Operating Temperature – -40°C~150°C TC
VIPER22A Circuit
Below is the VIPER22A Circuit:
Below are the benefits of an internal control circuit:
The VDD pin has a large input voltage range to accommodate changes in the auxiliary supply voltage. This feature can be used to adapt battery charger adapter configurations.
Automatic burst mode for low loads.
Overvoltage protection in the hiccup mode
Where to Use VIPER22A IC?
The VIPER22A IC is general use and is suitable for low power supply systems, LED drivers, remote microcontroller designs, SMPS circuits, and as well as auxiliary power supply.
VIPER22A Equivalent
You could use VIPER12A or AP8012 as VIPER22A Equivalents. You could find them on easybom.
Other Switching Regulators: LM2596, LM2576
How does VIPER22A work?
Fault Protection Circuit and Input Surge Protection
A fuse and a Metal Oxide Varistor (MOV) are the components of the fault protection circuit. The schematic shows that F1 is a series fuse of 1A, 250VAC slow-blow fuse. MOV is 7mm, 275V. Extreme current flow occurs when the input voltage rises above the limit, also known as voltage surge. This is when MOV is reduced to the fuse, and the maximum inrush current flows through the slow blow fuse.
Filter for Input
The input line filter capacitor is next to fault protection. To prevent unwanted line voltage noise from being generated in the circuit, a 250 VAC X-type line capacitor is connected.
Refrigerator with Full-Wave
An analog input voltage is converted to digital using a full-wave rectifier (1A, 1000V DB107). The digital signal is then processed and smoothened by a 400V capacitor with 22uF capacitance.
Change of Driver
Next comes the VIPER22A IC. To get the input bias, the integrated circuit is connected with the transformer winding. High-power MOSFETs are embedded in the IC to perform switching across the transformer. The diode D3 converts the analog output to DC, followed by the resistor of 10 ohms to resist the inrush current. To smoothen the DC output ripple, the output is passed through the capacitor.
Secondary Filtering & Rectifier
The schematic’s component D6 is the SB360 Schottky Diode, which has 3A 60V ratings. A power supply is being designed with a 2A output current. The specified diode will be used. The ripple removal from DC voltage is then done with C6 and post LC filter L2 & 7.
Feedback Mechanism
Because of optical communication, the feedback circuit is not connected to the VIPER22A driver circuit. The output voltage is detected by the TL431 shunt controller and R6, R7. The reference potential for the shunt regulator is 2.5 volts. The target output voltage is 5 volts. When the output voltage reaches 5 volts, the regulator achieves 2.5 volts across the pin. This controls the optocoupler that controls the ic VIPER22A driver circuit and TNY268PN. The switching will be halted if the other conditions are met.
Everything You Need to Know About VIPER22A IC in Electronics
What is a converter?
A converter is an electric circuit that accepts a DC input voltage and generates a DC output of a different voltage. This is usually accomplished by high-frequency switching using inductive or capacitive filter elements.
What are switching converters?
A switching regulator converts input direct current voltage into the desired voltage. A switching regulator is used in electronic devices to convert the voltage from a battery, another power source, to the voltages required for subsequent systems.
How do you convert DC to DC?
Switching techniques are used in practical electronic converters. The switchable-mode DC to DC converter converts one DC voltage level to another. This is done by temporarily storing energy and then releasing it to the output at a lower voltage.
VIPER22A Applications
Low power supply systems
LED drivers
Remote Microcontroller designs
SMPS circuits
Auxiliary Power Supply
Package Dimensions of IC VIPER22A
Below is the picture of the 2D Model and Dimensions from the VIPER22A Datasheet will be useful to know the package type and dimensions.
VIPER22A Datasheet
Download the VIPER22A Datasheet pdf below:
https://pdf.easybom.com/r/datasheets/stmicroelectronics-viper22as-datasheets-0444.pdf
Manufacturer
STMicroelectronics
STMicroelectronics is a globally recognized semiconductor company. They are dedicated to developing semiconductor solutions for various microelectronics applications. STMicroelectronics enjoys unrivaled silicon and system expertise, strong manufacturing strength, IP portfolio, and solid relationships with their strategic partners. Based on these advantages, STMicroelectronics has become a pioneer in System-on-Chip (SoC) technology and its products have a positive effect on realizing today’s convergence trends.
Conclusion
In short, the VIPER22A SMPS controller IC from STMicroelectronics has been extensively employed in AC to DC Converters in off-line power circuit designs. It is general use and is suitable for low power supply systems, LED drivers, remote microcontroller designs, SMPS circuits, and as well as auxiliary power supplies. Hope the above information could help you!
