LTC7813 datasheet(5/32 Pages) LINER

5 / 32 page

LTC7800

7800f

For more information www.linear.com/LTC7800

TYPICAL PERFORMANCE CHARACTERISTICS

FCM LOSS

BURST EFFICIENCY

VIN = 12V

VOUT = 3.3V

PULSE-SKIPPING

LOSS

BURST

LOSS

FCM EFFICIENCY

PULSE–SKIPPING

EFFICIENCY

0.0001

0.001

0.01

0.1

100

0.0001

0.001

0.01

0.1

OUTPUT CURRENT (A)

FIGURE 11 CIRCUIT

7800 G01

VOUT = 5V

VOUT = 3.3V

Burst Mode OPERATION

VIN = 12V

0.0001

0.001

0.01

0.1

100

OUTPUT CURRENT (A)

7800 G02

FIGURES 11, 12 CIRCUITS

ILOAD = 5A

VOUT = 5V

VOUT = 3.3V

100

7800 G03

INPUT VOLTAGE (V)

FIGURES 11, 12 CIRCUITS

Efficiency and Power Loss vs

Output Current

Efficiency vs Output Current

Efficiency vs Input Voltage

ELECTRICAL CHARACTERISTICS

Note 4: The LTC7800 is tested in a feedback loop that servos VITH to a

specified voltage and measures the resultant VFB. The specification at 85°C

is not tested in production and is assured by design, characterization and

correlation to production testing at other temperatures (125°C for the

LTC7800E/LTC7800I and 150°C for the LTC7800H.)

Note 5: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

Note 6: Rise and fall times are measured using 10% and 90% levels. Delay

times are measured using 50% levels

Note 7: The minimum on-time condition is specified for an inductor

peak-to-peak ripple current ≥ 40% of IMAX (See Minimum On-Time

Considerations in the Applications Information section).

Note 8: Do not apply a voltage or current source to these pins. They must

be connected to capacitive loads only, otherwise permanent damage may

occur.

Load Step

Burst Mode Operation

Load Step

Forced Continuous Mode

Load Step

Pulse-Skipping Mode

LOAD STEP = 500mA TO 5A

VIN = 12V

VOUT = 3.3V

FIGURE 11 CIRCUIT

20µs/DIV

7800 G04

VOUT

100mV/DIV

AC-

COUPLED

5A/DIV

LOAD STEP = 500mA TO 5A

VIN = 12V

VOUT = 3.3V

FIGURE 11 CIRCUIT

20µs/DIV

7800 G05

VOUT

100mV/DIV

AC-

COUPLED

5A/DIV

LOAD STEP = 500mA TO 5A

VIN = 12V

VOUT = 3.3V

FIGURE 11 CIRCUIT

50µs/DIV

7800 G06

VOUT

100mV/DIV

AC-

COUPLED

5A/DIV

LTC7813 bảng dữ liệu(PDF) 5 Page - Linear Technology

LTC7813 bảng dữ liệu(HTML) 5 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

bảng dữ liệu tải về

Link URL