Details

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BUY UCC3809D-2 https://www.utsource.net/itm/p/12510472.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	Vcc	Operating	7.5	-	40	V
Quiescent Current	Iq	Vcc = 15V, No Load	-	2.5	-	mA
Start-Up Current	Ist	Vcc = 15V, No Load	-	20	-	μA
Reference Voltage	Vref	Vcc = 15V	5.0	-	5.2	V
Oscillator Frequency	fosc	RT = 10kΩ, CT = 1nF	100	-	500	kHz
Dead Time	tdead	-	-	0.2	-	μs
Maximum Duty Cycle	Dmax	-	-	0.95	-	-
Minimum On-Time	ton(min)	Vcc = 15V	-	1.0	-	μs
Minimum Off-Time	toff(min)	Vcc = 15V	-	1.0	-	μs
Output Drive Capability	Iout	-	-	200	-	mA
Thermal Shutdown Temperature	Tsd	-	-	160	-	°C

Instructions for Using UCC3809D-2

1. Supply Voltage (Vcc):

   • Ensure the supply voltage is within the range of 7.5V to 40V.
   • Use appropriate decoupling capacitors (e.g., 0.1μF and 10μF) close to the Vcc pin to stabilize the supply.

2. Quiescent Current (Iq):

   • The quiescent current is typically 2.5mA at Vcc = 15V with no load. This should be considered in power budget calculations.

3. Start-Up Current (Ist):

   • The start-up current is typically 20μA at Vcc = 15V with no load. Ensure the power supply can handle this initial current draw.

4. Reference Voltage (Vref):

   • The reference voltage is typically between 5.0V and 5.2V. Use this voltage for setting up feedback and control loops.

5. Oscillator Frequency (fosc):

   • Set the oscillator frequency by selecting appropriate values for RT (resistor) and CT (capacitor). For example, RT = 10kΩ and CT = 1nF will set the frequency between 100kHz and 500kHz.

6. Dead Time (tdead):

   • The dead time is typically 0.2μs. This is the minimum time during which both output transistors are off to prevent shoot-through.

7. Maximum Duty Cycle (Dmax):

   • The maximum duty cycle is 95%. Ensure the control loop does not exceed this limit to avoid instability.

8. Minimum On-Time (ton(min)) and Minimum Off-Time (toff(min)):

   • The minimum on-time and off-time are both 1.0μs. These values should be considered when designing the PWM control loop to ensure proper operation.

9. Output Drive Capability (Iout):

   • The output drive capability is up to 200mA. Ensure the external components (e.g., MOSFETs) can handle this current.

10. Thermal Shutdown Temperature (Tsd):

    • The device will shut down if the temperature exceeds 160°C. Ensure proper heat dissipation and cooling to prevent thermal shutdown.

Additional Notes:

• Always refer to the datasheet for detailed information and specific application notes.
• Use appropriate protection circuits (e.g., overvoltage, undervoltage, and short-circuit protection) to ensure reliable operation.
• Test the circuit under various conditions to validate performance and stability.

(For reference only)