LM3554TMXSLASHNOPB datasheet(37/47 Pages) TI1

37 / 47 page

LM3554

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SNVS549C – JUNE 2009 – REVISED FEBRUARY 2016

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VOUT = 5 V

Voltage-Output Mode

Figure 51. Efficiency vs IOUT

VOUT = 5 V

Voltage-Output Mode

Figure 52. Efficiency vs VIN

Time Base: 100 µs/div

IFLASH = 1.2 A

Single LED

Ch 1: VOUT (2 V/div)

Ch 2: IL (500 mA/div)

Ch 4: ILED (500 mA/div)

Ch 3: STROBE (5 V/div)

Figure 53. Start-Up Into Flash Mode

Time Base: 100 µs/div

ITORCH = 180 mA

90-mA Torch Setting

Single LED

Chl 1: VOUT (2 V/div)

Ch 2: IL (500 mA/div)

Ch 4: ILED (100 mA/div)

Ch 3: TX1 (5 V/div)

Figure 54. Start-Up Into Hardware Torch Mode

Time Base: 100 µs/div

IFLASH = 1.2 A

ITORCH = 295 mA

Ch 1: VOUT (5 V/div)

Ch 2: IL (1 A/div)

Single LED

Ch 4: ILED (500 mA/div)

Ch 3: STROBE (5 V/div)

Figure 55. Torch Mode to Flash Mode Transition

Time Base: 20 µs/div

IFLASH = 1.2 A

ITORCH = 180 mA

Ch 1: VOUT (2 V/div)

Ch 2: IL (1 A/div)

Single LED

Ch 4: ILED (500 mA/div)

Ch 3: TX1 (5 V/div)

Figure 56. TX1 Interrupt Operation, TX1 Rising

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