LT3045 datasheet(16/44 Pages) AD

16 / 44 page

Data Sheet

LT83401/LT83402

analog.com

Rev. 0

16 of 44

Figure 28. Minimum On-Time vs. Temperature

Figure 29. Minimum On-Time vs. Load

Figure 30. ISET During Start-Up with Fast Start-Up Enabled

vs. Temperature

Figure 31. ISET During Start-Up with Fast Start-Up Enabled

vs. VIN to VSET Differential

Figure 32. Start-Up Time with and without Fast Start-Up

Circuitry for Large CSET

Figure 33. Soft-Start Waveforms

ILOAD = 1A

VSET = 0V, VOUT TO REGULATE TO 0V

fSW = 2MHz

FORCED CONTINUOUS MODE

TEMPERATURE (°C)

–50

–25

100

125

150

21.0

21.5

22.0

22.5

23.0

23.5

24.0

VIN = 12V, VSET = 0V, VOUT TO REGULATE 0V

fSW = 2MHz

LOAD CURRENT (A)

0.5

1.0

1.5

2.0

2.5

VSET = 1V

VIN = 3V

VIN = 12V

VIN = 18V

TEMPERATURE (°C)

–50

–25

100

125

150

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

VPGFB = 400mV

VIN TO 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 = 6.5V, RSET = 33.3kΩ, CSET = 4.7µF

fSW = 2MHz, L = 330nH, COUT = 5× 22µF

30ms/DIV

VOUT

1V/DIV

VEN

2V/DIV

CSET = 1µF

CSET = 4.7µF

CSET = 10µF

VIN = 12V, RSET = 33.3kΩ, WITH FAST START-UP

fSW = 2MHz, L = 2.2µH, COUT = 5× 22µF, RLOAD = 5Ω

1.5ms/DIV

VEN

2V/DIV

VOUT

1V/DIV

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