LT1082CTPBF

Manufacturer Part NumberLT1082CTPBF
ManufacturerLINEAR TECH
LT1082CTPBF datasheets

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LT1082CTPBF PDF datasheetLT1082CTPBF PDF datasheet #2
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FEATURES
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
U
APPLICATIO S
Telecom 5V Supply at 0.7A from –48V
90V Supply at 120mA from 15V
All Applications Using LT1072 (See Below for
Specification Differences)
LT1082 and LT1072 Major Specification Differences
LT1082C
V
3V to 75V
IN
V
100V
SW
Switch Current Limit
1A
Quiescent Current
4.5mA
Operating Frequency
60kHz
Flyback Reference Voltage
16.2 + 0.6 (35k /R
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.
U
TYPICAL APPLICATIO
Negative-to-Positive Telecom 5V Supply
*D1
**250 H
V
V
IN
SW
Q1
2N5401
33 F
+
LT1082
80V
CHEMI-CON
FB
SXE SERIES
GND
V
C
1.1k
4.7k
0.01 F
0.22 F
–20V
TO –70V
1082 TA01
1A High Voltage, Efficiency
Switching Voltage Regulator
DESCRIPTIO
®
The LT
1082 is a monolithic high voltage switching
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.
LT1072HV
The LT1082 has a unique feature to provide high voltage
3V to 60V
75V
short-circuit protection. When the FB pin is pulled down to
1.25A
0.6V and the current out of the pin reaches approximately
6mA
350 A, the switching frequency will shift down from
40kHz
60kHz to 12kHz.
) 16 + 0.35 (7k /R
)
FB
FB
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
V
OUT
INPUT VOLTAGE. SEE THE
5V, 0.7A
+
GRAPH ON THE RIGHT.
470 F
3.83k
10V
CHEMI-CON
SXE SERIES
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.
LT1082
U
Telecom 5V Supply Maximum Output
Current vs Input Voltage
1.0
f = 45kHz
I
LIMIT = 1.07A
SW
0.9
L=550 H
L=450 H
L=350 H
0.8
L=250 H
0.7
L=150 H
0.6
0.5
L=100 H
0.4
0
–10
–20
–30
–40 –50
–60 –70 –80
–90
INPUT VOLTAGE (V)
1082 TA02
sn1082 1082fas
1

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