LT3045 datasheet(17/44 Pages) AD

17 / 44 page

Data Sheet

LT83203/LT83205

analog.com

Rev. B

17 of 44

Figure 40. Switching Waveforms, Pulse-Skipping

Operation

Figure 41. Transient Response: Load Current

Stepped from 1A to 3A

Figure 42. Transient Response: Load Current Stepped

from 0.1A to 2.1A

Figure 43. LT83203/LT83205 Case Temperature Rise

Figure 44. LT83203 Radiated EMI Performance (CISPR32

Radiated Emission Test with Class B Limits)

Figure 45. LT83205 Radiated EMI Performance (CISPR32

Radiated Emission Test with Class B Limits)

12VIN TO 1VOUT AT 100mA

VSYNC = 0V

1µs/DIV

VSW

5V/DIV

500mA/DIV

10µs/DIV

ILOAD

1A/DIV

VOUT

20mV/DIV

VIN = 12V, VOUT = 1V, fSW = 2MHz, RC = 1.82kΩ, CC = 2.2nF

TYPICAL APPLICATION CIRCUIT

FORCED CONTINUOUS MODE

PULSE-SKIPPING MODE

0.1A

2.1A

20µs/DIV

ILOAD

2A/DIV

VOUT

20mV/DIV

VIN = 12V, VOUT = 1V, fSW = 2MHz, RC = 1.82kΩ, CC = 2.2nF

TYPICAL APPLICATION CIRCUIT

DEMO BOARD, ON STILL AIR

VIN = 12V

VOUT = 1V

fSW = 2MHz

LOAD CURRENT (A)

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

STANDARD DEMO BOARD

WITH EMI FILTER

CLASS B LIMIT

12V INPUT TO 1V OUTPUT AT 3A, fSW = 2MHz

HORIZONTAL OPERATING

VERTICAL OPERATING

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900 1000

–10

STANDARD DEMO BOARD

WITH EMI FILTER

CLASS B LIMIT

12V INPUT TO 1V OUTPUT AT 5A, fSW = 2MHz

HORIZONTAL OPERATING

VERTICAL OPERATING

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900 1000

–10

LT3045 Datasheet(PDF) 17 Page - Analog Devices

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