LCVT datasheet(18/24 Pages) LINER

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LT3684

3684f

maximum load current should be derated as the ambient

temperature approaches 125°C.

Power dissipation within the LT3684 can be estimated by

calculating the total power loss from an efﬁciency measure-

ment and subtracting the catch diode loss and inductor

loss. The die temperature is calculated by multiplying the

LT3684 power dissipation by the thermal resistance from

junction to ambient.

Figure 9. A Well Chosen Input Network Prevents Input Voltage Overshoot and

Ensures Reliable Operation when the LT3684 is Connected to a Live Supply

APPLICATIONS INFORMATION

LT3684

4.7

µF

VIN

20V/DIV

IIN

10A/DIV

µs/DIV

VIN

CLOSING SWITCH

SIMULATES HOT PLUG

IIN

(9a)

(9b)

LOW

IMPEDANCE

ENERGIZED

24V SUPPLY

STRAY

INDUCTANCE

DUE TO 6 FEET

(2 METERS) OF

TWISTED PAIR

LT3684

4.7

µF

0.1

µF

0.7

Ω

VIN

20V/DIV

IIN

10A/DIV

µs/DIV

DANGER

RINGING VIN MAY EXCEED

ABSOLUTE MAXIMUM RATING

(9c)

LT3684

4.7

µF

35V

AI.EI.

3684 F09

VIN

20V/DIV

IIN

10A/DIV

µs/DIV

Other Linear Technology Publications

Application Notes 19, 35 and 44 contain more detailed

descriptions and design information for buck regulators

and other switching regulators. The LT1376 data sheet

has a more extensive discussion of output ripple, loop

compensation and stability testing. Design Note 100

shows how to generate a bipolar output supply using a

buck regulator.

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