LM3424 datasheet(8/69 Pages) TI1

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DUTY CYCLE (%)

25 kHz

1 kHz

100

0.8

0.2

0.4

0.6

0.8

1.0

ICSH (éA)

1.0

0.8

0.6

0.4

0.2

0.0

100

VIN (V)

1.02

1.01

1.00

0.99

0.98

VIN (V)

1.010

1.005

1.000

0.995

0.990

VIN (V)

100

VIN (V)

100

LM3424, LM3424-Q1

SNVS603C – AUGUST 2009 – REVISED AUGUST 2015

www.ti.com

6.7 Typical Characteristics

TA=25°C and VIN = 14 V unless otherwise specified. The measurements for Figure 1, Figure 3, andFigure 6 were made using

the standard boost evaluation board from AN-1969 (SNVA397). The measurements for Figure 2, Figure 4, and Figure 5 were

made using the standard buck-boost evaluation board from AN-1967 (SNVA398).

VO = 21 V (6 LEDs)

VO = 32 V (9 LEDs)

Figure 2. Buck-Boost Efficiency vs. Input Voltage

Figure 1. Boost Efficiency vs Input Voltage

VO = 32 V (9 LEDs)

VO = 21 V (6 LEDs)

Figure 3. Boost LED Current vs. Input Voltage

Figure 4. Buck-Boost LED Current vs. Input Voltage

VO = 21 V (6 LEDs)

VIN = 24 V

VO = 32V (9 LEDs)

VIN = 24 V

Figure 5. Analog Dimming

Figure 6. PWM Dimming

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