The ** such networking and an pinOUT | Output voltage for the second output rail. | | 28 | VDD2 | Power input for the second rail. | | 29 | PGND2 | Power ground for the second rail. | | 30 | ILIM2 | Current limit for the second output rail. | | 31 | NC | No connection. This pin is internally not connected. | | 32 | NC | No connection. This pin is internally not connected. |
IC Circuit PrinciplesThe ISL6367HIRZ functions as a step-down (buck) regulator with multiple output options. The internal circuitry includes:
Switching Frequency Control: The switching frequency can be adjusted to optimize efficiency and output ripple. Feedback Control: The feedback pins monitor output voltage to ensure that the output stays within the desired voltage range. Thermal Management : Built-in thermal shutdown to protect the IC from overheating. Current Limiting: The ILIM pins provide over-current protection, ensuring safe operation under fault conditions.FAQ - 20 Common Questions
1. What is the input voltage range for the ISL6367HIRZ?The ISL6367HIRZ supports an input voltage range of 5V to 18V.
2. How do I enable the ISL6367HIRZ?The ISL6367HIRZ can be enabled by applying a high voltage to the EN pin. To disable it, pull the EN pin low.
3. **What does the *PGOOD* pin indicate?**The PGOOD pin provides a high signal when the output voltage is within the acceptable range, indicating that the power supply is operating correctly.
4. **What is the purpose of the *FB* pin?**The FB pin is used to provide feedback for the output voltage regulation. It connects to an external resistor divider to set the output voltage.
5. **What is the function of the *SS* pin?**The SS pin is for soft-start control. Connecting a capacitor to this pin adjusts the rate at which the output voltage rises during startup.
6. Can I use the ISL6367HIRZ in multiple output configurations?Yes, the ISL6367HIRZ can support multiple outputs using pins like FB2, VOUT2, VIN2, and PGOOD2.
7. **What are the recommended capacitors for the *C1* and C2 pins?**Typically, ceramic capacitors with values between 10nF to 100nF are used for C1 and C2 to filter high-frequency noise.
8. How does the thermal shutdown feature work?The THERMAL pin provides protection. If the IC overheats, it will shut down to prevent damage.
9. **What should I do if the *PGOOD* pin remains low?**If the PGOOD pin is low, it indicates an issue with the output voltage regulation. Check for problems such as incorrect feedback or a short circuit.
10. How do I set the output voltage?The output voltage is set using a resistor divider connected to the FB pin.
11. **What is the function of the *ILIM* pin?**The ILIM pin sets the current limit threshold for the IC, protecting against over-current conditions.
12. Can I use the ISL6367HIRZ for a 12V output?Yes, you can set the output to 12V by adjusting the feedback resistor network connected to the FB pin.
13. What is the maximum output current?The output current depends on the specific application and design but typically supports up to several amps depending on the component values.
14. **What happens if I connect the *FB* pin incorrectly?**An incorrect connection to the FB pin will cause incorrect output voltage or instability.
15. How does the IC manage multiple power rails?For multiple power rails, the IC uses dedicated pins like FB2, PGOOD2, and VOUT2 to control each output individually.
16. Can I use the ISL6367HIRZ with a 5V input?Yes, the ISL6367HIRZ can accept input voltages as low as 5V.
17. What is the recommended ground connection?The PGND and GND pins should be connected to the ground plane separately to minimize noise and ensure proper regulation.
18. What is the soft-start duration?The soft-start duration is set by the external capacitor connected to the SS pin, and it helps limit inrush current during startup.
19. Can I connect unused pins?Unused pins like NC can be left unconnected or tied to ground.
20. What are the common troubleshooting steps if the IC is not working?If the IC is not working, check for issues such as incorrect input voltage, poor ground connections, improper feedback resistor values, and thermal shutdown.
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