LM2586T-3.3 National Semiconductor, LM2586T-3.3 Datasheet - Page 19

• Manufacturer Part Number: LM2586T-3.3
• Description: Power Supply IC
• Manufacturer: National Semiconductor

Specifications of LM2586T-3.3

• Output Current: 3A
• Output Voltage: 3.3VDC
• No. Of Pins: 7
• Peak Reflow Compatible (260 C): No
• Termination Type: Through Hole
• Leaded Process Compatible: No
• Mounting Type: Through Hole
• Package / Case: 7-TO-220
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Typical Flyback Regulator Applications
FIGURE 28. Schott 67140900
FIGURE 29. Schott 67140890
Top View
Top View
T6
T5
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FIGURE 27. Schott 26606
Top View
T7
19
Step-Up (Boost) Regulator
Operation
Figure 30 shows the LM2586 used as a step-up (boost)
regulator. This is a switching regulator that produces an
output voltage greater than the input supply voltage.
A brief explanation of how the LM2586 Boost Regulator
works is as follows (refer to Figure 30). When the NPN
switch turns on, the inductor current ramps up at the rate of
V
off, the lower end of the inductor flies above V
its current through diode (D) into the output capacitor (C
at a rate of (V
inductor during the switch on time is transferred to the output
during the switch off time. The output voltage is controlled by
adjusting the peak switch current, as described in the flyback
regulator section.
(Continued)
IN
/L, storing energy in the inductor. When the switch turns
OUT
01251647
− V
IN
)/L. Thus, energy stored in the
IN
, discharging
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OUT
)