LM3501 datasheet(12/26 Pages) TI2

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LM3501

SNVS230C – DECEMBER 2003 – REVISED MAY 2013

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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

1) SHDN, 1 V/div, DC

2) IL, 100 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.

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