LM5177 datasheet(17/112 Pages) TI

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6.7 Typical Characteristics

The following conditions apply (unless otherwise noted): TJ = 25°C; V(VCC2) = 5V

RT-pin Resistor(k )

100

150

200

250

300

350

100

200

300

400

500

600

Figure 6-1. Switching Frequency Versus RT Resistance

Te mperature (

C)

10 15 20 25 30 35 40 45 50 55 60 65 70

378

384

390

396

402

408

414

420

426

432

438

444

450

456

462

Figure 6-2. Switching Frequency versus Temperature

R(RT) = 75KΩ

Te mperature (

C)

10 15 20 25 30 35 40 45 50 55 60 65 70

0.99

0.992

0.994

0.996

0.998

1.002

1.004

1.006

1.008

1.01

Figure 6-3. FB Pin Reference Voltage versus Temperature

DAC Code (dec)

250

500

750 1000 1250 1500 1750 2000 2250 2500

250

500

750

1000

1250

1500

1750

2000

2250

2500

Figure 6-4. FB Pin Reference Voltage versus VO Register DAC-

Code

Figure 6-5. Shutdown Current into VIN versus Pin Voltage

VEN/UVLO = 0V ,V(VIN) = 12V, V(BIAS) = 0V

Figure 6-6. Shutdown Current into VIN versus Temperature

VEN/UVLO = 0V ,V(VIN) = 12V,V(BIAS) =

Temperature ( C)

10 15 20 25 30 35 40 45 50 55 60 65 70

0.4

0.8

1.2

1.6

2.4

2.8

3.2

3.6

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LM251772

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