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LM3501 Datasheet(PDF) 12 Page - Texas Instruments

Part # LM3501
Description  LM3501 Synchronous Step-up DC/DC Converter for White LED Applications
PDF  26 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM3501 Datasheet(HTML) 12 Page - Texas Instruments

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LM3501
SNVS230C – DECEMBER 2003 – REVISED MAY 2013
www.ti.com
Typical Performance Characteristics (continued)
PMOS RDSON
vs.
Temperature
Typical VIN Ripple
3 LEDs, RLED = 22Ω, VIN = 3.0V, CNTRL = 2.7V
1) SW, 10 V/div, DC
3) IL, 100 mA/div, DC
4) VIN, 100 mV/div, AC
T = 250 ns/div
Figure 27.
Figure 28.
Start-Up (LM3501-16)
SHDN Pin Duty Cycle Control Waveforms
3 LEDs, RLED = 22Ω, VIN = 3.0V, CNTRL = 2.7V
LM3501-16, 3 LEDs, RLED = 22Ω, VIN = 3.0V, SHDN frequency = 200
Hz
1) SHDN, 1 V/div, DC
1) SHDN, 1 V/div, DC
2) IL, 100 mA/div, DC
2) IL, 100 mA/div, DC
3) ILED, 20 mA/div, DC
3) ILED, 20 mA/div, DC
T = 100 µs/div
4) VOUT, 10 V/div, DC
T = 1 ms/div
Figure 29.
Figure 30.
Typical VOUT Ripple, OVP Functioning (LM3501-16)
Typical VOUT Ripple, OVP Functioning (LM3501-21)
VOUT open circuit and equals approximately 15V DC, VIN = 3.0V
VOUT open circuit and equals approximately 20V DC, VIN = 3.0V
3) VOUT, 200 mV/div, AC
1) VOUT, 200 mV/div, AC
T = 1 ms/div
T = 400 µs/div
Figure 31.
Figure 32.
12
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