Details

---

BUY UCC2818AN https://www.utsource.net/itm/p/883179.html
BiCMOS POWER FACTOR PREREGULATOR

Parameter	Symbol	Min	Typical	Max	Unit
Input Voltage	V_IN	10	-	400	V
Operating Frequency	f_SW	-	65	100	kHz
Quiescent Current	I_Q	-	0.3	-	mA
Output Voltage (Vcc)	V_VCC	10.5	-	20	V
Under-Voltage Lockout	V_UVLO	9	-	10.5	V
Start-Up Current	I_START	-	1.5	-	μA
Hiccup Mode Current Limit	I_HICCUP	-	1.5	-	A
Maximum Duty Cycle	D_MAX	-	0.5	-	-
Minimum On-Time	t_ON(MIN)	0.8	-	-	μs
Thermal Shutdown	T_SHDN	-	160	-	°C

Instructions for Use:

1. Input Voltage (V_IN):

   • Ensure the input voltage is within the range of 10V to 400V to avoid damage to the device.

2. Operating Frequency (f_SW):

   • The typical operating frequency is 65kHz, but it can be adjusted up to 100kHz depending on the application requirements.

3. Quiescent Current (I_Q):

   • The quiescent current is typically 0.3mA, which is important for low-power applications.

4. Output Voltage (V_VCC):

   • The output voltage (Vcc) should be between 10.5V and 20V. Ensure the external components are designed to support this range.

5. Under-Voltage Lockout (V_UVLO):

   • The device will not operate if the input voltage drops below 9V and will restart when the voltage rises above 10.5V.

6. Start-Up Current (I_START):

   • The start-up current is typically 1.5μA, which is crucial for ensuring proper initialization of the circuit.

7. Hiccup Mode Current Limit (I_HICCUP):

   • In hiccup mode, the current limit is set to 1.5A to protect against overcurrent conditions.

8. Maximum Duty Cycle (D_MAX):

   • The maximum duty cycle is 0.5 (50%), which helps prevent overloading the power supply.

9. Minimum On-Time (t_ON(MIN)):

   • The minimum on-time is 0.8μs, which is important for maintaining stable operation at high frequencies.

10. Thermal Shutdown (T_SHDN):

    • The device will shut down if the temperature exceeds 160°C to prevent thermal damage. Ensure adequate cooling for continuous operation.

Additional Notes:

• Always refer to the datasheet for detailed specifications and application notes.
• Proper PCB layout and component selection are critical for optimal performance.
• Use appropriate external components such as resistors, capacitors, and inductors to match the specific application requirements.

(For reference only)