LT1082CTPBF LINEAR TECH, LT1082CTPBF Datasheet

LT1082CTPBF

Manufacturer Part Number

LT1082CTPBF

Description

Manufacturer

LINEAR TECH

Datasheets

1.LT1082CTPBF.pdf (12 pages)

2.LT1082CTPBF.pdf (12 pages)

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FEATURES

APPLICATIO S

USER NOTE: This data sheet is only intended to provide specifications, graphs, and a general

functional description of the LT1082. Application circuits are included to show the capability of the

LT1082. A complete design manual (AN19) and Switcher CAD (LTC Switching Power Supply Design

Program) should be obtained to assist in developing new designs. This manual contains a

comprehensive discussion of both the LT1070 and the external components used with it, as well as

complete formulas for calculating the values of these components. The manual can also be used for

the LT1082 by factoring in the lower switch current rating.

TYPICAL APPLICATIO

Switch Current Limit

Quiescent Current

Operating Frequency

Flyback Reference Voltage

Wide Input Voltage Range: 3V to 75V

High Switch Voltage: 100V

Low Quiescent Current: 4.5mA

Internal 1A Switch

Shutdown Mode Draws Only 120 A Supply Current

Isolated Flyback Regulation Mode for Fully Floating

Outputs

Can Be Externally Synchronized

Available in MiniDIP and TO-220 Packages

Same Pinout as LT1072

Telecom 5V Supply at 0.7A from –48V

90V Supply at 120mA from 15V

All Applications Using LT1072 (See Below for

Specification Differences)

CHEMI-CON

SXE SERIES

TO –70V

–20V

LT1082 and LT1072 Major Specification Differences

33 F

80V

Negative-to-Positive Telecom 5V Supply

GND

LT1082

16.2 + 0.6 (35k /R

4.7k

**250 H

0.22 F

3V to 75V

LT1082C

4.5mA

60kHz

100V

0.01 F

2N5401

*D1

1.1k

1082 TA01

3.83k

) 16 + 0.35 (7k /R

MOTOROLA MUR110 (100V, 1A)

69 TURNS OF #28 AWG WIRE ON A

MICROMETALS T60 TYPE 52 CORE.

NOTE: THIS CORE IS LOW COST, BUT

HAS HIGHER CORE LOSS AND IS LARGER

THAN NECESSARY FOR LOWER CURRENT

APPLICATIONS. FOR SMALLER INDUCTORS

OR HIGHER EFFICIENCY, USE A LOW LOSS

CORE SUCH AS MAGNETICS INC. KOOL M

OR MOLYPERMALLOY.

470 F

10V

CHEMI-CON

SXE SERIES

LT1072HV

3V to 60V

40kHz

1.25A

6mA

75V

5V, 0.7A

OUT

)

Switching Voltage Regulator

1A High Voltage, Efficiency

DESCRIPTIO

The LT

regulator. It can be operated in all standard switching

configurations including buck, boost, flyback, forward,

and inverting. A 1A high efficiency switch is included on

the die along with all oscillator, control, and protection

circuitry.

The LT1082 operates with supply voltages from 3V to 75V,

switch voltage up to 100V and draws only 4.5mA quies-

cent current. It can deliver load power up to 20W with no

external power devices. By utilizing current-mode switch-

ing techniques, it provides excellent AC and DC load and

line regulation.

An externally activated shutdown mode reduces total

supply current to 120 A typical for standby operation.

Totally isolated and regulated outputs can be generated by

using the optional “isolated flyback regulation mode” built

into the LT1082, without the need for optocouplers or

extra transformer windings.

The LT1082 has a unique feature to provide high voltage

short-circuit protection. When the FB pin is pulled down to

0.6V and the current out of the pin reaches approximately

350 A, the switching frequency will shift down from

60kHz to 12kHz.

The LT1082 is nearly identical to the lower voltage LT1072.

For the major differences in specifications, see the table on

the left.

, LTC and LT are registered trademarks of Linear Technology Corporation

NOTE: MAXIMUM OUTPUT

CURRENT IS A FUNCTION OF

INPUT VOLTAGE. SEE THE

GRAPH ON THE RIGHT.

1082 is a monolithic high voltage switching

Telecom 5V Supply Maximum Output

1.0

0.9

0.8

0.7

0.6

0.5

0.4

Current vs Input Voltage

f = 45kHz

–10

LIMIT = 1.07A

–20

–30

INPUT VOLTAGE (V)

–40 –50

–60 –70 –80

L=550 H

L=450 H

L=350 H

L=250 H

L=150 H

L=100 H

LT1082

1082 TA02

sn1082 1082fas

–90

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