LT3045 datasheet(15/45 Pages) AD

15 / 45 page

Data Sheet

LT83201

analog.com

Rev. A 15 of 45

Figure 34. ISET During Start-Up with Fast Start-Up

Enabled (vs. VIN − VSET Differential)

Figure 35. Start-Up Time with and without Fast

Start-Up Circuitry for Large CSET

Figure 36. Soft-Start Waveforms

Figure 37. Power-Good High Thresholds

Figure 38. Power-Good Low Thresholds

Figure 39. Error Amp Output Current

VPGFB = 400mV

VIN − VSET DIFFERENTIAL (V)

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

WITH FAST START-UP

WITHOUT FAST START-UP

VIN = 5V, RSET = 10kΩ, CSET = 4.7µF

fSW = 2MHz, L = 330nH, COUT = 5 × 22µF, RLOAD = 5Ω

50ms/DIV

VOUT

250mV/DIV

VEN

2V/DIV

CSET = 1µF

CSET = 4.7µF

CSET = 10µF

VIN = 5V, RSET = 10kΩ, WITH FAST START-UP

fSW = 2MHz, L = 330nH, COUT = 5 × 22µF, RLOAD = 5Ω

500µs/DIV

VOUT

500mV/DIV

VEN

2V/DIV

PGFB RISING

PGFB FALLING

TEMPERATURE (°C)

–50

–25

100

125

520

522

524

526

528

530

532

534

536

538

540

PGFB RISING (START-UP)

PGFB RISING

PGFB FALLING

TEMPERATURE (°C)

–50

–25

100

125

450

455

460

465

470

475

480

485

490

495

500

VC = 1.2V

VSET = 1V

VOUTS – VSET ERROR (mV)

–250 –200 –150 –100

–50

100

150

200

250

–500

–400

–300

–200

–100

100

200

300

400

500

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