Details

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BUY TPS54628DDA https://www.utsource.net/itm/p/12419825.html

Parameter	Symbol	Min	Typ	Max	Unit
Input Voltage	VIN	4.5	-	18	V
Output Voltage	VOUT	0.8	-	5.5	V
Output Current	IOUT	-	6	8	A
Switching Frequency	fSW	200	700	1500	kHz
Efficiency (Typical)	η	-	93	-	%
Quiescent Current	IQ	-	65	-	μA
Shutdown Current	ISD	-	1	-	μA
Soft-Start Time	tSS	2.5	-	20	ms
Enable Threshold (Rising)	VEN(R)	1.18	-	1.32	V
Enable Threshold (Falling)	VEN(F)	0.98	-	1.12	V
Thermal Shutdown Temperature	TSD	-	160	-	°C
Operating Junction Temperature	TJ	-40	-	125	°C

Instructions for Using TPS54628DDA

1. Power Supply Connection:

   • Connect the input voltage (VIN) to the input pin.
   • Ensure the input voltage is within the range of 4.5V to 18V.
   • Connect the output voltage (VOUT) to the load.

2. Output Voltage Setting:

   • Use the feedback resistor network (R1 and R2) to set the desired output voltage.
   • The formula to calculate the output voltage is: ( V_ = V_ times left(1 + fracright) )
   • The reference voltage ( V_ ) is typically 0.8V.

3. Switching Frequency Configuration:

   • Set the switching frequency using an external resistor (RT) connected to the RT/CLK pin.
   • The formula to calculate the switching frequency is: ( f_ = frac{1.1 times 10^6} )
   • For example, a 20kΩ resistor will result in a switching frequency of approximately 55kHz.

4. Soft-Start Configuration:

   • The soft-start time can be adjusted by connecting a capacitor (CSS) between the SS/TRK pin and ground.
   • The formula to calculate the soft-start time is: ( t_ = 1.2 times 10^6 times C_ )
   • For example, a 10nF capacitor will result in a soft-start time of approximately 12ms.

5. Enable Pin:

   • The enable pin (EN) controls the on/off state of the regulator.
   • Apply a voltage greater than the rising threshold (1.18V to 1.32V) to turn on the regulator.
   • Apply a voltage less than the falling threshold (0.98V to 1.12V) to turn off the regulator.

6. Thermal Management:

   • Ensure proper heat dissipation to keep the junction temperature within the operating range (-40°C to 125°C).
   • Use a heatsink or thermal pad if necessary.

7. Protection Features:

   • The device includes overcurrent protection, thermal shutdown, and undervoltage lockout.
   • These features help protect the device and the load from damage.

8. Layout Considerations:

   • Place the input and output capacitors as close as possible to the respective pins.
   • Use wide and short traces for power and ground connections to minimize inductance and resistance.
   • Ensure good grounding to reduce noise and improve stability.

By following these instructions, you can effectively use the TPS54628DDA in your power supply design.

(For reference only)