Details

---

BUY UCC2806DW https://www.utsource.net/itm/p/12444414.html

Below is the parameter table and instructions for the UCC2806DW, a high-voltage current-mode controller from Texas Instruments.

UCC2806DW Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Test Conditions
Supply Voltage	Vcc	10.5	15.0	28.0	V	-
Start-Up Current	Istart	-	450	-	μA	Vcc = 15V
Operating Current	Icc	-	2.5	-	mA	Vcc = 15V
Threshold Voltage	Vth	1.0	1.3	1.6	V	-
Hysteresis Voltage	Vhys	0.15	0.25	0.35	V	-
Maximum Duty Cycle	Dmax	-	50	-	%	-
Minimum Off-Time	toff(min)	2.5	3.5	4.5	μs	-
Oscillator Frequency	fosc	50	100	500	kHz	-
Current Limit Threshold	Ilim	200	300	400	mA	-
Shutdown Current	Ishutdown	-	50	-	μA	Vcc = 15V
Temperature Range	Toper	-40	25	125	°C	-

Instructions for Using the UCC2806DW

1. Power Supply Connection:

   • Connect the Vcc pin to a supply voltage between 10.5V and 28V.
   • Ensure that the supply voltage is stable and within the specified range to avoid damage to the device.

2. Startup and Operating Current:

   • The device starts up when the Vcc voltage exceeds the threshold voltage (Vth).
   • During operation, the device draws a typical operating current of 2.5mA.

3. Threshold and Hysteresis:

   • The device has a threshold voltage (Vth) of 1.3V with a hysteresis voltage (Vhys) of 0.25V to ensure stable operation.

4. Duty Cycle and Off-Time:

   • The maximum duty cycle (Dmax) is 50%.
   • The minimum off-time (toff(min)) is 3.5μs, which helps prevent excessive switching frequency and ensures proper operation.

5. Oscillator Frequency:

   • Set the oscillator frequency (fosc) using an external resistor and capacitor. The typical frequency range is 50kHz to 500kHz.

6. Current Limiting:

   • The device includes a current limit threshold (Ilim) to protect against overcurrent conditions. The typical value is 300mA.

7. Shutdown Mode:

   • To enter shutdown mode, reduce the Vcc voltage below the threshold voltage or use an external control signal to disable the device. The shutdown current (Ishutdown) is typically 50μA.

8. Temperature Considerations:

   • The device operates over a temperature range of -40°C to 125°C. Ensure proper heat dissipation to maintain reliable operation at higher temperatures.

9. Layout and PCB Design:

   • Use proper PCB layout techniques to minimize noise and parasitic effects. Keep high-frequency traces short and use ground planes to reduce interference.

10. Testing and Troubleshooting:

    • Test the device under various load conditions to ensure it meets the design specifications.
    • Use an oscilloscope to monitor the waveforms at key points (e.g., Vcc, output, current sense) to diagnose any issues.

By following these instructions and parameters, you can effectively integrate the UCC2806DW into your power supply or converter design.

(For reference only)