Details

---

BUY NCP1377BDR2G https://www.utsource.net/itm/p/546105.html
PWM Current−Mode Controller for Free−Running Quasi−Resonant Operation

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Input Voltage	VIN	4.5	-	60	V
Output Voltage	VOUT	-	2.5	-	V	Fixed
Output Current	IOUT	-	2	2.5	A
Switching Frequency	fSW	-	650	-	kHz
Efficiency (Typical)	η	-	92	-	%	@ 5V, 2A
Quiescent Current	IQ	-	80	-	μA
Start-up Current	IST	-	30	-	μA
Shutdown Current	ISD	-	1	-	μA
Thermal Shutdown Temperature	TSD	-	160	-	°C
Operating Junction Temperature	TJ	-40	-	125	°C
Storage Temperature	TSTG	-40	-	150	°C

Instructions for NCP1377BDR2G

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 4.5V to 60V.
   • Use appropriate input filtering and transient protection to avoid voltage spikes.

2. Output Voltage (VOUT):

   • The output voltage is fixed at 2.5V. No external components are required to set this voltage.

3. Output Current (IOUT):

   • The device can provide up to 2.5A of output current, with typical performance at 2A.
   • Ensure adequate heat dissipation if operating near the maximum current to maintain efficiency and reliability.

4. Switching Frequency (fSW):

   • The switching frequency is fixed at 650kHz. This helps in reducing the size of external components like inductors and capacitors.

5. Efficiency (η):

   • The typical efficiency is 92% when operating at 5V input and 2A output.
   • Efficiency can vary based on input voltage, output current, and environmental conditions.

6. Quiescent Current (IQ):

   • The quiescent current is typically 80μA. This is important for low-power applications where standby power consumption needs to be minimized.

7. Start-up Current (IST):

   • The start-up current is typically 30μA. This is the current drawn by the device during the initial power-up phase.

8. Shutdown Current (ISD):

   • The shutdown current is typically 1μA. This is the current drawn by the device when it is in the shutdown mode.

9. Thermal Shutdown Temperature (TSD):

   • The device will enter thermal shutdown if the junction temperature exceeds 160°C. Ensure proper heat sinking and ventilation to prevent thermal shutdown.

10. Operating Junction Temperature (TJ):

    • The operating junction temperature range is from -40°C to 125°C. Ensure the device operates within this range to avoid damage.

11. Storage Temperature (TSTG):

    • The storage temperature range is from -40°C to 150°C. Store the device in a dry and cool environment to maintain its performance and reliability.

Additional Notes:

• PCB Layout:
  • Proper PCB layout is crucial for optimal performance. Keep the ground plane solid and wide, and place the input and output capacitors as close as possible to the device.
• Capacitors:
  • Use high-quality ceramic capacitors for input and output filtering to ensure stability and reduce ripple.
• Inductor Selection:
  • Choose an inductor with low DC resistance (DCR) to minimize power loss and heat generation. The inductor value should be selected based on the desired ripple current and output voltage regulation.

For more detailed information, refer to the datasheet provided by the manufacturer.

(For reference only)