Instructions for Using the SG1524BJ

1. Power Supply:

   • Connect the supply voltage (Vcc) between 10V and 40V to pin 16.
   • Ground (GND) is connected to pin 8.

2. Oscillator Configuration:

   • Connect an external resistor (Rosc) between pins 6 and 7.
   • Connect an external capacitor (Coss) between pin 7 and ground.
   • The frequency can be calculated using the formula: ( f_ = frac{1.1}{R_ times C_} ).

3. Reference Voltage:

   • The internal reference voltage (Vref) is 5V and is available at pin 14.

4. Error Amplifier:

   • Connect the inverting input (pin 1) to the feedback network.
   • Connect the non-inverting input (pin 2) to the reference voltage (Vref).

5. PWM Comparator:

   • The output of the error amplifier is compared with the sawtooth waveform generated by the oscillator.
   • Adjust the duty cycle by modifying the feedback network.

6. Output Stage:

   • The output stage is a push-pull configuration with open-collector outputs.
   • Connect external transistors or MOSFETs to drive the load.
   • Ensure the maximum output current (Iout) does not exceed 400mA.

7. Shutdown Function:

   • To shut down the device, pull pin 4 (shutdown) low.
   • The shutdown current (Ishd) is approximately 10μA.

8. Thermal Considerations:

   • Ensure adequate heat dissipation if operating at high temperatures or high power levels.
   • The operating temperature range is from -40°C to 85°C.

9. Start-Up Time:

   • The start-up time (tstart) is typically 3ms.

10. Capacitor Selection:

    • Choose the oscillator capacitor (Coss) within the range of 10pF to 100pF to achieve the desired frequency.

11. Hysteresis:

    • The PWM comparator has a built-in hysteresis of 20mV to 50mV to prevent oscillation and improve stability.

12. Layout Considerations:

    • Use short leads and wide traces for power and ground connections to minimize noise.
    • Place bypass capacitors close to the Vcc and GND pins to filter out high-frequency noise.