Details

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BUY 3844B https://www.utsource.net/itm/p/12611345.html

Parameter	Description	Value
Device Type	High-Voltage MOSFET Controller	-
Input Voltage Range	Input voltage range for the controller	5V to 40V
Output Current	Maximum output current	1A
Operating Temperature	Operating temperature range	-40掳C to 125掳C
Package Type	Package type	SOIC-8
Pin Count	Number of pins	8
Frequency Range	Switching frequency range	100kHz to 500kHz
Protection Features	Built-in protection features	Overcurrent, Overvoltage, Thermal Shutdown
Quiescent Current	Quiescent current at no load	1.5mA
Shutdown Mode Current	Current consumption in shutdown mode	1渭A
Output Voltage Range	Adjustable output voltage range	1.23V to 37V

Instructions for Use

1. Power Supply Connection:

   • Connect the input voltage (VIN) to Pin 8.
   • Ground (GND) is connected to Pin 1.

2. Output Configuration:

   • The output voltage can be adjusted using an external resistor divider network connected between the FB (Feedback) pin (Pin 6) and the output.
   • The formula to calculate the output voltage (VOUT) is: VOUT = 1.23V * (1 + R2/R1), where R1 and R2 are the resistors in the feedback network.

3. Switching Frequency:

   • Set the switching frequency by connecting a resistor (RT) between the RT/CT pin (Pin 5) and ground. The frequency can be calculated using the formula: fSW = 1 / (1.1 * RT * CT), where RT is in ohms and CT is in farads.

4. Current Limiting:

   • The current limit can be set by connecting a sense resistor (RS) between the CS (Current Sense) pin (Pin 4) and ground. The current limit is given by: ILIM = 0.5V / RS, where RS is in ohms.

5. Thermal Management:

   • Ensure adequate heat dissipation by providing a good thermal path from the device to the PCB or a heatsink if necessary.

6. Shutdown Mode:

   • To enter shutdown mode, pull the SHDN (Shutdown) pin (Pin 7) low. The device will consume minimal current in this state.

7. Protection Circuits:

   • The device includes overcurrent, overvoltage, and thermal shutdown protections. These features will automatically activate to protect the device under fault conditions.

8. Layout Considerations:

   • Keep the high-current paths short and wide to minimize parasitic inductance and resistance.
   • Place decoupling capacitors close to the VIN and GND pins to ensure stable operation.

9. Storage and Handling:

   • Store the device in a dry environment and handle with care to avoid damage from electrostatic discharge (ESD).

For detailed application circuits and further information, refer to the datasheet provided by the manufacturer.

(For reference only)