LT1082IQ#PBF Linear Technology, LT1082IQ#PBF Datasheet

IC SWTCHNG REG HI-V/EFF 1A 5-DD

LT1082IQ#PBF

Manufacturer Part Number
LT1082IQ#PBF
Description
IC SWTCHNG REG HI-V/EFF 1A 5-DD
Manufacturer
Linear Technology
Type
Step-Down (Buck), Step-Up (Boost), Inverting, Flyback, Forward Converterr
Datasheet

Specifications of LT1082IQ#PBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Current - Output
1A
Frequency - Switching
60kHz
Voltage - Input
3 ~ 75 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
D²Pak, TO-263 (5 leads + tab)
Power - Output
20W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LT1082IQ#PBFLT1082IQ
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LT1082IQ#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LT1082IQ#PBFLT1082IQ#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
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
V
V
Switch Current Limit
Quiescent Current
Operating Frequency
Flyback Reference Voltage
IN
SW
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
U
LT1082
V
V
IN
C
16.2 + 0.6 (35k /R
4.7k
**250 H
0.22 F
V
SW
FB
3V to 75V
LT1082C
4.5mA
60kHz
100V
1A
0.01 F
2N5401
*D1
1.1k
1082 TA01
U
Q1
3.83k
FB
**
*
) 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
V
5V, 0.7A
OUT
FB
)
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
U
Telecom 5V Supply Maximum Output
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0
Current vs Input Voltage
f = 45kHz
I
SW
–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
1

Related parts for LT1082IQ#PBF

LT1082IQ#PBF Summary of contents

Page 1

... 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 ...

Page 2

LT1082 BSOLUTE Supply Voltage ....................................................... 75V Switch Output Voltage .......................................... 100V Feedback Pin Voltage (Transient, 1ms) ................ 15V Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. ...

Page 3

ELECTRICAL C HARA TERISTICS C temperature range, otherwise specifications are at T specified. SYMBOL PARAMETER I Supply Current Q Control Pin Threshold Normal/Flyback Threshold on Feedback Pin f Switching Frequency BV Output Switch Breakdown Voltage Control Voltage to Switch Current ...

Page 4

LT1082 W U TYPICAL PERFOR A Suggested Core Size and Inductance for Telecom 5V Supply TYPE 52 KOOL M LOAD POWDERED OR MOLY- CURRENT IRON PERMALLOY 100mA T38 250 H T38 200 H 200mA T50 250 H T38 150 H ...

Page 5

W U TYPICAL PERFOR A Isolated Mode Flyback Reference Voltage 10k –75 –50 –25 0 100 25 50 ...

Page 6

LT1082 W U TYPICAL PERFOR A Error Amplifier Transconductance 5000 I (V PIN 4500 m V (FB PIN) 4000 3500 3000 2500 2000 1500 1000 500 0 –75 –50 – 100 125 TEMPERATURE ...

Page 7

W BLOCK I D AGRA V IN 2.3V REG OSC 60kHz 14kHz MODE SELECT FB 1.24V REF U OPERATIO The LT1082 is a current mode switcher. This means that switch duty cycle is directly controlled by switch current rather than ...

Page 8

LT1082 U OPERATIO disconnect the main error amplifier output and connects the output of the flyback amplifier to the comparator input. The LT1082 will then regulate the value of the flyback pulse with respect to the supply voltage. This flyback ...

Page 9

U OPERATIO Total power dissipation is the sum of supply current times input voltage plus switch power )( TOT typical example, using negative-to-positive converter to generate 5V at 0.5A ...

Page 10

LT1082 O TYPICAL A PPLICATI + V IN 30V to 70V V IN 15V 25 F PACKAGE DESCRIPTIO 0.300 BSC CORNER LEADS OPTION (0.762 BSC) 0.008 – 0.018 0 – 15 0.045 – 0.068 (0.203 – 0.457) (1.143 – 1.727) ...

Page 11

... DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights Package 8-Lead PDIP (Narrow ...

Page 12

... MEASURED AT THE SEATING PLANE T5 (TO-220) 0399 = 1.2V, SO8 Package REF = 1.2V, MSOP-8 Package REF = 0.8V, MSOP-8 Package REF = 0.8V, MSOP-10, TSSOP-16E Package REF sn1082 1082fas LT/CPI 0202 1.5K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1993 ...

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