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PDF LT1082 Data sheet ( Hoja de datos )
| Número de pieza | LT1082 | |
| Descripción | 1A High Voltage/ Efficiency Switching Voltage Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1082
1A High Voltage, Efficiency
Switching Voltage Regulator
FEATURES
s Wide Input Voltage Range: 3V to 75V
s High Switch Voltage: 100V
s Low Quiescent Current: 4.5mA
s Internal 1A Switch
s Shutdown Mode Draws Only 120µA Supply Current
s Isolated Flyback Regulation Mode for Fully Floating
Outputs
s Can Be Externally Synchronized
s Available in MiniDIP and TO-220 Packages
s Same Pinout as LT1072
APPLICATI S
s Telecom 5V Supply at 0.7A from –48V
s 90V Supply at 120mA from 15V
s All Applications Using LT1072 (See Below for
Specification Differences)
LT1082 and LT1072 Major Specification Differences
LT1082C
LT1072HV
VIN
VSW
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 (35kΩ/RFB) 16 + 0.35 (7kΩ/RFB)
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.
DESCRIPTIO
The LT1082 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 120µA 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
350µA, 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.
33µF
80V
+
CHEMI-CON
SXE SERIES
–20V
TO –70V
Negative-to-Positive Telecom 5V Supply
**250µH
VIN VSW
LT1082
*D1
+
3.83k
Q1
2N5401
VOUT
5V, 0.7A
470µF
10V
CHEMI-CON
SXE SERIES
NOTE: MAXIMUM OUTPUT
CURRENT IS A FUNCTION
OF INPUT VOLTAGE. SEE
THE GRAPH ON THE RIGHT.
GND VC
FB
* MOTOROLA MUR110 (100V, 1A)
** 69 TURNS OF #28 AWG WIRE ON A
1.1k MICROMETALS T60 TYPE 52 CORE.
4.7k
0.22µF
0.01µF
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
1082 TA01
CORE SUCH AS MAGNETICS INC. KOOL Mµ
OR MOLYPERMALLOY.
Telecom 5V Supply Maximum Output
Current vs Input Voltage
1.0
f = 45kHz
0.9 ISW LIMIT = 1.07A
0.8
L=550µH
L=450µH
L=350µH
L=250µH
0.7
0.6 L=150µH
0.5
L=100µH
0.4
0 –10 –20 –30 –40 –50 –60 –70 –80 –90
INPUT VOLTAGE (V)
1082 TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LT1082
Isolated Mode Flyback
Reference Voltage
25
24
23 RFB = 3k
22
21
20 RFB = 6k
19 RFB = 10k
18
17
16
15
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
Feedback Bias Current vs
Temperature
800
1082 G09
700
600
500
400
300
200
100
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
1082 G12
Supply Current vs Supply Voltage
(Shutdown Mode)
200
160
VC = 50mV
120
80 VC = 0V
40
0
0 10 20 30 40 50 60 70 80
SUPPLY VOLTAGE (V)
1082 G15
Reference Voltage and Switching
Frequency vs Temperature
70 1.250
65 VREF
FREQ
60
1.245
1.240
55 1.235
50 1.230
45 1.225
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
1082 G11
Normal/Feedback Mode
Threshold on Feedback Pin
750 –24
725 FEEDBACK PIN VOLTAGE
700 (AT THRESHOLD)
– 22
– 20
675 –18
650 –16
625 –14
600
575 FEEDBACK PIN CURRENT
(AT THRESHOLD)
550
– 12
– 10
–8
525 –6
500 –4
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
1082 G16
Driver Current* vs Switch Current
100
90
80
70
60
50
40
30
20
10
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
SWITCH CURRENT (A)
* AVERAGE SUPPLY CURRENT
= I Q + DC(2.9 + 10–2ISW + 10 –5 ISW2)
IQ = QUIESCENT CURRENT, DC = DUTY CYCLE,
ISW = SWITCH CURRENT
1082 G13
Line Regulation
5
4
3
2
1
0 TJ = –55°C
–1
–2 TJ = 150°C
–3 TJ = 25°C
–4
–5
0 10 20 30 40 50 60 70 80
INPUT VOLTAGE (V)
1082 G10
Shutdown Mode Supply Current
200
180
–55°C ≤ TJ ≤ 125°C
160
140
TJ = 150°C
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80 90 100
VC PIN VOLTAGE (mV)
1082 G17
Supply Current vs Input Voltage**
14
13
12
11
10
90% DUTY CYCLE
9
8
7 50% DUTY CYCLE
6 10% DUTY CYCLE
5
4 0% DUTY CYCLE
3
2
0 10 20 30 40 50 60 70 80
INPUT VOLTAGE (V)
**UNDER VERY LOW OUTPUT CURRENT CONDITIONS,
DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH
10% OR LESS.
1082 G14
5
5 Page 
PACKAGE DESCRIPTIO Dimensions in inches (milimeters) unless otherwise noted.
LT1082
J8 Package
8-Lead Ceramic DIP
0.290 – 0.320
(7.366 – 8.128)
0.008 – 0.018
(0.203 – 0.460)
0.385 ± 0.025
(9.779 ± 0.635)
CORNER LEADS OPTION
(4 PLCS)
0° – 15°
0.023 – 0.045
(0.58 – 1.14)
HALF LEAD
OPTION
0.045 – 0.065
(1.14 – 1.65)
FULL LEAD
OPTION
0.045 – 0.065
(1.14 – 1.65)
0.014 – 0.026
(0.360 – 0.660)
0.200
(5.080)
MAX
0.015 – 0.060
(0.381 – 1.524)
0.005
(0.127)
MIN
0.405
(10.287)
MAX
8 765
0.125
3.175
0.100 ± 0.010 MIN
(2.540 ± 0.254)
0.025
(0.635)
RAD TYP
0.220 – 0.310
(5.588 – 7.874)
1 234
0.300 – 0.320
(7.620 – 8.128)
N8 Package
8-Lead Plastic DIP
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.0
(3.302 ± 0.127)
0.400
(10.160)
MAX
87 65
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.325 –0.015
( )8.255
+0.635
–0.381
0.065
(1.651)
TYP
0.045 ± 0.015
(1.143 ± 0.381)
0.100 ± 0.010
(2.540 ± 0.254)
0.125
(3.175)
MIN
0.020
(0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.250 ± 0.010
(6.350 ± 0.254)
12
34
0.060
(1.524)
0.331
+0.012
–0.020
( )8.407
+0.305
–0.508
0.143
+0.012
–0.020
( )3.632
+
–
0.305
0.508
Q Package
5-Lead Plastic DD
0.401 ± 0.015
(10.185 ± 0.381)
15° TYP
0.175 ± 0.008
(4.445 ± 0.203)
0.059
(1.499)
TYP
0.067 ± 0.010
(1.702 ± 0.254)
0.032 ± 0.008
(0.813 ± 0.203)
0.022 ± 0.005
(0.559 ± 0.127)
0.050 ± 0.008
(1.270 ± 0.203)
0.004
+0.008
–0.004
( )0.102
+
–
0.203
0.102
0.105 ± 0.008
(2.667 ± 0.203)
0.050 ± 0.012
(1.270 ± 0.305)
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.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1082.PDF ] | |
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