MC34119D datasheet by Freescale Semiconductor

MC34119D Frequently Asked Questions (FAQs)

• What is the recommended layout and placement for the MC34119D?
  The recommended layout and placement for the MC34119D involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing the length of the traces between the device and the capacitors. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
• How do I ensure the MC34119D is stable and doesn't oscillate?
  To ensure stability, make sure to follow the recommended component values and layout guidelines. Additionally, ensure that the input and output capacitors are of high quality and have low ESR. A minimum of 10uF input capacitance and 22uF output capacitance is recommended. Also, avoid using capacitors with high ESL (Equivalent Series Inductance).
• What is the maximum input voltage that the MC34119D can handle?
  The MC34119D can handle a maximum input voltage of 18V, but it's recommended to operate within the specified input voltage range of 7V to 15V for optimal performance and reliability.
• Can I use the MC34119D in a high-temperature environment?
  The MC34119D is rated for operation up to 125°C, but it's essential to consider the thermal design and ensure proper heat dissipation. A heat sink or thermal pad may be required for high-temperature applications.
• How do I program the MC34119D's soft-start feature?
  The MC34119D's soft-start feature can be programmed using an external resistor (RSS) connected between the SS pin and GND. The soft-start time can be calculated using the formula: tSS = 10 x RSS x CIN, where CIN is the input capacitance.