LM2672N-ADJ National Semiconductor, LM2672N-ADJ Datasheet - Page 13

• Manufacturer Part Number: LM2672N-ADJ
• Description: SWITCHING REG 1A ADJ, 2672, DIP8
• Manufacturer: National Semiconductor

Specifications of LM2672N-ADJ

• Primary Input Voltage: 40V
• No. Of Outputs: 1
• Output Voltage: 37V
• Output Current: 1A
• Voltage Regulator Case Style: DIP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Svhc: No SVHC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7. Frequency Synchronization (optional)
The LM2672 (oscillator) can be synchronized to run with an
external oscillator, using the sync pin (pin 3). By doing so, the
LM2672 can be operated at higher frequencies than the
standard frequency of 260 kHz. This allows for a reduction in
the size of the inductor and output capacitor.
As shown in the drawing below, a signal applied to a RC filter at
the sync pin causes the device to synchronize to the frequency
of that signal. For a signal with a peak-to-peak amplitude of 3V
or greater, a 1 kΩ resistor and a 100 pF capacitor are suitable
values.
LM2672 Series Buck Regulator Design Procedure (Fixed Output)
Inductor Value Selection Guides
(For Continuous Mode Operation)
PROCEDURE (Fixed Output Voltage Version)
FIGURE 4. LM2672-3.3
FIGURE 5. LM2672-5.0
01293430
01293429
13
7. Frequency Synchronization (optional)
For all applications, use a 1 kΩ resistor and a 100 pF capacitor
for the RC filter.
EXAMPLE (Fixed Output Voltage Version)
FIGURE 7. LM2672-ADJ
FIGURE 6. LM2672-12
01293432
(Continued)
01293431
www.national.com