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Self-Supplied Monolithic Switcher for Low Standby- Power Offline SMPS

Below is the parameter table and instructions for the NCP1014ST100T3, which is a high-voltage monolithic switcher IC from ON Semiconductor.

Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Condition
Input Voltage Range	VIN	90	-	265	V	AC Line Input
Output Voltage	VOUT	-	5.0	-	V	Fixed Output
Output Current	IOUT	-	100	-	mA	Continuous
Quiescent Current	IQ	-	1.5	-	mA	No Load
Efficiency at Full Load	η	-	70	-	%	VIN = 230VAC, POUT = 500mW
Switching Frequency	fSW	-	65	-	kHz	Typical
Start-Up Time	tSTART	-	500	-	ms	VIN = 85VAC
Shutdown Current	ISD	-	10	-	μA	Shutdown Mode
Thermal Shutdown Temperature	TSD	-	160	-	°C	Internal Junction
Operating Temperature Range	TOPR	-40	-	125	°C	Storage and Operation
Storage Temperature Range	TSTG	-65	-	150	°C	Storage

Instructions

1. Circuit Design:

   • The NCP1014ST100T3 is designed to operate as a flyback converter. Ensure that the transformer and other external components are selected based on the output voltage and current requirements.
   • Use a high-frequency transformer with a turns ratio suitable for the desired output voltage.

2. Input Capacitor:

   • Place a bulk input capacitor (e.g., 22μF to 100μF) close to the VIN pin to filter the input voltage and reduce ripple.

3. Output Capacitor:

   • Use a low ESR electrolytic capacitor (e.g., 470μF to 1000μF) on the output to maintain a stable output voltage and minimize ripple.

4. Feedback Loop:

   • The feedback loop is internal and does not require external components for basic operation. However, for precise regulation, consider using an external resistor divider if necessary.

5. Thermal Management:

   • Ensure adequate heat dissipation by mounting the IC on a heatsink or a PCB with sufficient copper area. The maximum junction temperature should not exceed 160°C.

6. Protection Features:

   • The IC includes overvoltage, overcurrent, and thermal shutdown protection. These features will automatically shut down the device under fault conditions.

7. PCB Layout:

   • Keep the PCB layout compact to minimize parasitic inductances and capacitances. Route high-current paths directly and use wide traces to reduce resistance and heating.

8. Testing:

   • Before finalizing the design, test the circuit under various load conditions to ensure stable operation and compliance with efficiency and performance specifications.

9. Compliance:

   • Ensure that the design meets all relevant safety and regulatory standards, such as UL, CE, and FCC.

By following these guidelines, you can effectively design and implement a power supply using the NCP1014ST100T3.

(For reference only)