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Below is the parameter table and instructions for the TOP245YN, a high-voltage power switch from Power Integrations.

TOP245YN Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Input Voltage Range	VIN	100	-	375	V
Output Voltage Regulation	VOUT	4.5	5.0	5.5	V	No load to full load
Maximum Output Current	IOUT	-	1.5	2.0	A	25°C ambient temperature
Power Dissipation	PD	-	1.8	2.5	W	25°C ambient temperature
Thermal Shutdown Temperature	TSD	-	160	170	°C
Start-Up Current	ISTART	1.5	2.0	2.5	mA
Operating Temperature Range	TOPR	-40	-	125	°C
Storage Temperature Range	TSTG	-55	-	150	°C
Junction-to-Ambient Thermal Resistance	RθJA	-	50	60	°C/W
Junction-to-Case Thermal Resistance	RθJC	-	20	25	°C/W

Instructions for TOP245YN

1. Circuit Design:

   • Ensure that the input voltage (VIN) is within the specified range (100V to 375V).
   • Use appropriate filtering capacitors on the input and output to reduce noise and ripple.
   • Connect the output capacitor (COUT) close to the output pins to minimize inductance.

2. Thermal Management:

   • Place the device on a heatsink or a PCB with adequate copper area to dissipate heat.
   • Ensure that the thermal resistance (RθJA) is within the specified limits to prevent overheating.

3. Protection Circuits:

   • Implement overvoltage protection (OVP) to safeguard against excessive output voltages.
   • Use a thermal shutdown circuit to protect the device from excessive temperatures.

4. Startup and Operation:

   • The device will start up when the input voltage reaches the start-up current threshold (ISTART).
   • Monitor the operating temperature to ensure it remains within the specified range (-40°C to 125°C).

5. Mounting and Handling:

   • Handle the device with care to avoid damage to the pins and internal components.
   • Follow standard ESD (Electrostatic Discharge) precautions during handling and assembly.

6. Testing and Verification:

   • Test the output voltage and current under various load conditions to ensure regulation.
   • Verify the thermal performance by measuring the temperature at the junction and ambient.

By following these parameters and instructions, you can ensure reliable and efficient operation of the TOP245YN in your application.

(For reference only)