Details

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BUY SG1826-0905 https://www.utsource.net/itm/p/12595100.html

Parameter	Value/Description
Part Number	SG1826-0905
Function	Pulse Width Modulation (PWM) Controller
Operating Voltage	7V to 40V
Oscillator Frequency	50kHz to 400kHz (Adjustable via external components)
Output Current	1A (peak)
Package Type	DIP-8, SOIC-8
Operating Temperature	-40掳C to +125掳C
Quiescent Current	1.5mA (typical)
Shutdown Mode	< 1渭A
Protection Features	Overcurrent Protection, Thermal Shutdown

Instructions for Use:

1. Power Supply Connection:

   • Connect the power supply to the Vcc and GND pins. Ensure the voltage is within the operating range (7V to 40V).

2. Oscillator Configuration:

   • Set the desired oscillator frequency by connecting an external resistor (Rt) and capacitor (Ct) between the OSC and GND pins. The frequency can be calculated using the formula: [ f = frac{1.1}{R_t times C_t} ]

3. Output Configuration:

   • Connect the load or external MOSFET driver to the OUT pin. Ensure the load current does not exceed the maximum output current (1A peak).

4. Feedback Loop:

   • Connect the feedback resistor (Rfb) between the FB pin and the output voltage divider to set the desired output voltage.

5. Shutdown Mode:

   • To put the device into shutdown mode, pull the SHDN pin low. This will reduce the quiescent current to less than 1渭A.

6. Protection Circuits:

   • The device includes overcurrent protection and thermal shutdown features to protect against short circuits and overheating. Ensure proper heat dissipation for reliable operation.

7. Thermal Considerations:

   • For high-power applications, ensure adequate heat sinking to keep the device within the operating temperature range (-40掳C to +125掳C).

8. Layout Recommendations:

   • Keep the power supply and ground connections short and wide to minimize noise and improve stability.
   • Place decoupling capacitors close to the Vcc and GND pins to filter out high-frequency noise.

9. Testing and Troubleshooting:

   • Before finalizing the design, test the circuit under various conditions to ensure stable operation. Check for proper output voltage, frequency, and current levels.
   • If issues arise, verify all connections, component values, and power supply voltages.

(For reference only)