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BUY VIPER20ADIP-E https://www.utsource.net/itm/p/822607.html
The VIPER20ADIP-E is a fixed frequency SMPS Primary Offline Converter. The device is made using VIPower M0 technology, combines on the same silicon chip a state-of-the-art PWM circuit together with an optimized, high voltage and vertical power MOSFET. Typical applications cover off-line power supplies with a secondary power capability of 10W in wide range condition and 20W in single range or with doubler configuration. It is compatible from both primary and secondary regulation loop despite using around 50% less components when compared with a discrete solution. Burst mode operation is an additional feature of this device offering the ability to operate in stand-by mode without extra components.

Below is the parameter table and instructions for the VIPER20ADIP-E, which is a high-performance offline flyback converter IC from STMicroelectronics.

VIPER20ADIP-E Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Condition
Input Voltage	VIN	85	-	265	V	AC
Output Voltage	VOUT	3.3	5	15	V	Adjustable
Output Current	IOUT	-	200	-	mA	Continuous
Switching Frequency	fSW	-	65	-	kHz	Fixed
Quiescent Current	IQ	-	1.5	-	mA	No load
Efficiency	η	-	78	-	%	Typical at full load
Dropout Voltage	VDROPOUT	-	1.5	-	V	At full load
Thermal Shutdown Temperature	TSD	-	160	-	°C	Internal
Operating Temperature Range	TOPR	-40	-	125	°C	Storage and operation
Package Type		-	DIP-8	-

Instructions for VIPER20ADIP-E

1. Circuit Design

• Input Capacitor (CIN): Use a high-quality X2-rated capacitor to filter the input voltage.
• Output Capacitor (COUT): Choose a low ESR capacitor to minimize output ripple.
• Transformer (T1): Select a transformer with appropriate turns ratio and core material to meet the output voltage and current requirements.
• Feedback Resistor (RFB): Set the feedback resistor to adjust the output voltage according to the formula: ( V_ = 1.23 times left(1 + fracright) ).

2. PCB Layout

• Thermal Management: Ensure good thermal management by providing a heat sink or using a PCB with a large copper area for heat dissipation.
• Component Placement: Place components close to the VIPER20ADIP-E to minimize trace lengths, especially for high-frequency signals.
• Grounding: Use a solid ground plane to reduce noise and improve stability.

3. Protection Features

• Overvoltage Protection (OVP): The IC includes internal overvoltage protection to safeguard against excessive output voltage.
• Overcurrent Protection (OCP): The IC limits the output current to prevent damage to the load or the IC itself.
• Thermal Shutdown: The IC will shut down if the temperature exceeds the thermal shutdown threshold to prevent overheating.

4. Startup and Operation

• Startup Sequence: The VIPER20ADIP-E will start up when the input voltage reaches the minimum operating level.
• Steady-State Operation: Once started, the IC will maintain the output voltage within the specified range as long as the input voltage and load conditions are within the operating limits.

5. Troubleshooting

• No Output Voltage: Check the input voltage, transformer connections, and feedback network.
• High Output Ripple: Verify the output capacitor and transformer design.
• Overheating: Ensure proper thermal management and check for any short circuits or excessive load.

For detailed application notes and further information, refer to the official datasheet and application notes provided by STMicroelectronics.

(For reference only)