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| 型号： | LT1082CQ#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 1A D2PAK |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相，回扫，正向转换器 |
| 输出数： | 1 |
| 输入电压： | 3 V ~ 75 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 12kHz ~ 60kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 包装： | 管件 |
| 供应商设备封装： | D2PAK-5 |
LT1082
1A High Voltage, Efficiency
Switching Voltage Regulator
FEATURES
DESCRIPTIO
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Wide Input Voltage Range: 3V to 75V
High Switch Voltage: 100V
Low Quiescent Current: 4.5mA
Internal 1A Switch
Shutdown Mode Draws Only 120 μ 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
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-
APPLICATIO S
ing techniques, it provides excellent AC and DC load and
line regulation.
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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 LT1072HV
An externally activated shutdown mode reduces total
supply current to 120 μ 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.
V IN
V SW
Switch Current Limit
Quiescent Current
Operating Frequency
Flyback Reference Voltage
3V to 75V 3V to 60V
100V 75V
1A 1.25A
4.5mA 6mA
60kHz 40kHz
16.2 + 0.6 (35k ? /R FB ) 16 + 0.35 (7k ? /R FB )
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 μ A, the switching frequency will shift down from
60kHz to 12kHz.
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
Negative-to-Positive Telecom 5V Supply
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
Telecom 5V Supply Maximum Output
Current vs Input Voltage
33 μ F
80V
+
**250 μ H
V IN V SW
LT1082
*D1
Q1
2N5401
3.83k
+
V OUT
5V, 0.7A
470 μ F
10V
CHEMI-CON
SXE SERIES
NOTE: MAXIMUM OUTPUT
CURRENT IS A FUNCTION OF
INPUT VOLTAGE. SEE THE
GRAPH ON THE RIGHT.
1.0
0.9
0.8
0.7
f = 45kHz
I SW LIMIT = 1.07A
L=550 μ H
L=450 μ H
L=350 μ H
L=250 μ H
CHEMI-CON
SXE SERIES
GND
V C
FB
* MOTOROLA MUR110 (100V, 1A)
** 69 TURNS OF #28 AWG WIRE ON A
0.6
L=150 μ H
1.1k
MICROMETALS T60 TYPE 52 CORE.
–20V
TO –70V
4.7k
0.22 μ F
0.01 μ F
1082 TA01
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 μ
OR MOLYPERMALLOY.
0.5
0.4
L=100 μ H
0 –10 –20 –30 –40 –50 –60 –70 –80 –90
INPUT VOLTAGE (V)
1082 TA02
sn1082 1082fas
1
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