Instructions for Using the HV9910

1. Supply Voltage (VDD):

   • Ensure the supply voltage is within the range of 8V to 40V.
   • Use appropriate decoupling capacitors (e.g., 100nF and 10μF) close to the VDD pin to filter out noise.

2. Start-Up Current (ISTART):

   • The IC draws approximately 25μA during start-up. This is important for calculating the power consumption during initial power-on.

3. Operating Current (IQ):

   • The typical operating current is 3.5mA. Ensure your power supply can provide this current continuously.

4. Shutdown Current (ISD):

   • When the IC is in shutdown mode, it draws only 0.1μA. Use this feature to minimize power consumption in low-power applications.

5. Output Voltage (VOUT):

   • The output voltage is set by the feedback resistor network. The typical value is 1.25V at the FB pin. Adjust the resistors to achieve the desired output voltage.

6. Feedback Input Voltage (VFB):

   • The feedback input voltage is 1.25V. Use this reference to design the feedback network for precise regulation.

7. Oscillator Frequency (fOSC):

   • The typical oscillator frequency is 650kHz. Adjust the external components (if necessary) to fine-tune the switching frequency.

8. Minimum ON and OFF Times (tON(min), tOFF(min)):

   • The minimum ON and OFF times are both 2.5μs. Ensure that the PWM signals respect these timings to avoid instability.

9. Maximum Duty Cycle (D(max)):

   • The maximum duty cycle is 97%. Design the circuit to stay within this limit to prevent overdriving the output stage.

10. Thermal Shutdown Threshold (TSD):

    • The IC will shut down if the temperature exceeds 160°C. Ensure proper heat dissipation and thermal management to prevent overheating.

11. Storage Temperature Range (TSTG):

    • Store the IC in an environment where the temperature ranges from -40°C to 125°C to ensure reliability and longevity.

Additional Notes:

• Always refer to the datasheet for detailed information and specific application notes.
• Use appropriate protection circuits (e.g., overvoltage, undervoltage, and short-circuit protection) to enhance the reliability of your design.