Details

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Below is the parameter table and instructions for the TPS40210, a synchronous step-down DC-DC controller from Texas Instruments:

TPS40210 Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Condition
Input Voltage	VIN	4.5	-	60	V
Output Voltage	VOUT	0.8	-	5.5	V	Set by feedback resistor divider
Switching Frequency	fSW	100	-	1000	kHz	Adjustable via RT resistor
Current Limit	ILIM	0.3	1.0	2.5	A	Adjustable via ILIM pin
Reference Voltage	VREF	-	0.8	-	V
Enable Threshold	VEN	1.2	1.3	1.4	V
Shutdown Current	ISD	-	1.5	-	渭A	VIN = 12V, EN = 0V
Operating Temperature	TJ	-40	-	125	掳C
Storage Temperature	TSTG	-65	-	150	掳C

Instructions for Using the TPS40210

1. Input Voltage (VIN):

   • The TPS40210 can operate with input voltages ranging from 4.5V to 60V. Ensure that the input voltage is within this range to avoid damage to the device.

2. Output Voltage (VOUT):

   • The output voltage is set by a feedback resistor divider connected between the output and the FB pin. The formula to calculate the output voltage is: [ V_ = V_ left(1 + fracright) ] where ( V_ = 0.8V ).

3. Switching Frequency (fSW):

   • The switching frequency can be adjusted by connecting a resistor (RT) between the RT/CLK pin and ground. The relationship between the resistor value and the switching frequency is given by: [ f_ = frac{1.1 times 10^6} ] where ( R_T ) is in ohms.

4. Current Limit (ILIM):

   • The current limit can be adjusted by connecting a resistor (RILIM) between the ILIM pin and ground. The relationship between the resistor value and the current limit is given by: [ I_ = frac{0.8}{R_} ] where ( R_ ) is in ohms.

5. Enable (EN) Pin:

   • The EN pin controls the enable/disable function of the TPS40210. The device is enabled when the voltage on the EN pin exceeds the enable threshold (typically 1.3V). To disable the device, pull the EN pin below the enable threshold.

6. Thermal Considerations:

   • The operating temperature range of the TPS40210 is from -40掳C to 125掳C. Ensure proper heat dissipation to keep the junction temperature within this range.

7. Storage Temperature:

   • The storage temperature range is from -65掳C to 150掳C. Store the device in a dry, cool place to prevent damage.

8. Layout Considerations:

   • Use a good PCB layout to minimize noise and improve performance. Keep the power and ground traces short and wide, and use a ground plane to reduce inductance.

9. Capacitors:

   • Use high-quality, low ESR capacitors for the input and output. The input capacitor should be placed as close as possible to the VIN and GND pins to minimize parasitic inductance.

10. Inductor Selection:

    • Choose an inductor with a saturation current higher than the maximum output current and a low DC resistance to minimize power loss.

By following these instructions and parameters, you can effectively design and implement a power supply using the TPS40210.

(For reference only)