LM2585T-ADJ/NOPB National Semiconductor, LM2585T-ADJ/NOPB Datasheet - Page 19

• Manufacturer Part Number: LM2585T-ADJ/NOPB
• Description: IC MULTI CONFIG ADJ 3A TO220-5
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r
• Type: Step-Up (Boost), Flyback, Forward Converterr

Specifications of LM2585T-ADJ/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adjustable
• Current - Output: 3A
• Frequency - Switching: 100kHz
• Voltage - Input: 4 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Bent and Staggered Leads)
• Package: 5TO-220
• Minimum Input Voltage: 4 V
• Maximum Input Voltage: 40 V
• Switching Frequency: 85 to 115 KHz
• Operating Supply Voltage: 4 to 40 V
• Maximum Output Current: 3 A
• Output Type: Adjustable
• Output Voltage: 11.52 to 12.48 V
• Efficiency: 93(Typ) %
• Dc To Dc Converter Type: Step Up
• Pin Count: 5 +Tab
• Input Voltage: 40V
• Switching Freq: 85 TO 115KHz
• Output Current: 3A
• Package Type: TO-220
• Switching Regulator: Yes
• Load Regulation: 100mV
• Line Regulation: 100mV
• Mounting: Through Hole
• Input Voltage (min): 4V
• Operating Temperature Classification: Automotive
• Primary Input Voltage: 40V
• No. Of Outputs: 1
• No. Of Pins: 5
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 1 - Unlimited
• Filter Terminals: Through Hole
• Rohs Compliant: Yes
• For Use With: 551011367-061 - BOARD WEBENCH LM2577,LM2585/87
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Compliant
• Other names: *LM2585T-ADJ; *LM2585T-ADJ/NOPB; LM2585T-ADJ

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By adding a small number of external components (as shown in
Figure
30), the LM2585 can be used to produce a regulated output voltage that is greater than
the applied input voltage. The switching waveforms observed during the operation of this circuit are shown in
Figure
31. Typical performance of this regulator is
shown in
Figure
32.
FIGURE 30. 12V Boost Regulator
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A: Switch Voltage, 10 V/div
B: Switch Current, 2 A/div
C: Inductor Current, 2 A/div
D: Output Ripple Voltage,
100 mV/div, AC-Coupled
Horizontal: 2 μs/div
FIGURE 31. Switching Waveforms
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FIGURE 32. V
Response to Load Current Step
OUT
19
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