Details

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BUY MC34129D https://www.utsource.net/itm/p/49722.html
HIGH PERFORMANCE CURRENT MODE CONTROLLERS

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	-	3.0	5.5	16.0	V
Output Voltage	VOUT	-	1.25	-	13.8	V
Output Current	IOUT	-	-	1.0	1.5	A
Switching Frequency	fSW	-	250	500	750	kHz
Quiescent Current	IQ	VIN = 5V	-	5	10	mA
Shutdown Current	ISD	VIN = 5V	-	0.1	0.5	μA
Dropout Voltage	VDROPOUT	IOUT = 1.0A	-	0.5	1.0	V
Load Regulation	ΔVOUT	IOUT = 0 to 1.5A	-	1.0	2.0	%
Line Regulation	ΔVOUT	VIN = 4.5 to 16V	-	0.5	1.0	%
Thermal Shutdown	TSD	-	-	160	-	°C
Operating Temperature	TOPR	-	-40	-	125	°C

Instructions for Use:

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 3.0V to 16.0V.
   • Use appropriate filtering capacitors on the input side to reduce noise and ripple.

2. Output Voltage (VOUT):

   • The output voltage can be adjusted using external resistors. Refer to the datasheet for the specific resistor values required for your desired output voltage.
   • Use a suitable output capacitor to stabilize the output and filter out any switching noise.

3. Output Current (IOUT):

   • The device can provide up to 1.5A of output current, with a typical value of 1.0A.
   • Ensure the load does not exceed the maximum output current to avoid overheating or damage.

4. Switching Frequency (fSW):

   • The switching frequency can be set between 250kHz and 750kHz using an external resistor.
   • Higher frequencies reduce the size of external components but may increase switching losses.

5. Quiescent Current (IQ):

   • The quiescent current is typically 5mA at 5V input.
   • Ensure that the quiescent current is accounted for in power budget calculations.

6. Shutdown Current (ISD):

   • The shutdown current is very low, typically 0.1μA, allowing the device to be used in battery-powered applications where power consumption needs to be minimized.

7. Dropout Voltage (VDROPOUT):

   • The dropout voltage is the minimum difference between the input and output voltages required to maintain regulation.
   • At 1.0A output current, the typical dropout voltage is 0.5V.

8. Load Regulation (ΔVOUT):

   • The load regulation is the change in output voltage as the load current changes from 0 to 1.5A.
   • Typical load regulation is 1.0%.

9. Line Regulation (ΔVOUT):

   • The line regulation is the change in output voltage as the input voltage changes from 4.5V to 16V.
   • Typical line regulation is 0.5%.

10. Thermal Shutdown (TSD):

    • The device will shut down if the temperature exceeds 160°C to prevent damage.
    • Ensure proper heat dissipation and cooling, especially when operating at high currents or in high ambient temperatures.

11. Operating Temperature (TOPR):

    • The device can operate over a wide temperature range from -40°C to 125°C.
    • Ensure the operating environment is within these limits to avoid performance degradation or failure.

12. PCB Layout:

    • Follow recommended PCB layout guidelines to minimize parasitic effects and ensure optimal performance.
    • Place input and output capacitors as close as possible to the device to reduce inductance and improve stability.

13. Protection Features:

    • The device includes overcurrent protection, thermal shutdown, and short-circuit protection to enhance reliability and protect against faults.

For detailed design considerations and application circuits, refer to the MC34129D datasheet and application notes provided by the manufacturer.

(For reference only)