LT3480EMSE データシートの表示（PDF） - Linear Technology

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LT3480EMSE

36V, 2A, 2.4MHz Step-Down Switching Regulator with 70µA Quiescent Current

Linear Technology 

LT3480

APPLICATIONS INFORMATION

CLOSING SWITCH

SIMULATES HOT PLUG

IIN VIN

LT3480

+

4.7µF

VIN

20V/DIV

LOW

IMPEDANCE

ENERGIZED

24V SUPPLY

STRAY

INDUCTANCE

DUE TO 6 FEET

(2 METERS) OF

TWISTED PAIR

IIN

10A/DIV

(10a)

0.7Ω

LT3480

VIN

20V/DIV

+

0.1µF

4.7µF

IIN

10A/DIV

(10b)

DANGER

RINGING VIN MAY EXCEED

ABSOLUTE MAXIMUM RATING

20µs/DIV

20µs/DIV

+

22µF +

35V

AI.EI.

LT3480

4.7µF

VIN

20V/DIV

IIN

10A/DIV

(10c)

20µs/DIV

3480 F10

Figure 10. A Well Chosen Input Network Prevents Input Voltage Overshoot and

Ensures Reliable Operation when the LT3480 Is Connected to a Live Supply

the LT3480, it is possible to dissipate enough heat to raise

the junction temperature beyond the absolute maximum of

125°C. When operating at high ambient temperatures, the

maximum load current should be derated as the ambient

temperature approaches 125°C.

Power dissipation within the LT3480 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

LT3480 power dissipation by the thermal resistance from

junction to ambient.

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.

3480fe

18

For more information www.linear.com/LT3480

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