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PDF LT1070HVMK Data sheet ( Hoja de datos )
| Número de pieza | LT1070HVMK | |
| Descripción | 5A and 2.5A High Efficiency Switching Regulators | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Wide Input Voltage Range: 3V to 60V
s Low Quiescent Current: 6mA
s Internal 5A Switch (2.5A for LT1071)
s Very Few External Parts Required
s Self Protected Against Overloads
s Operates in Nearly All Switching Topologies
s Shutdown Mode Draws Only 50µA Supply Current
s Flyback Regulated Mode Has Fully Floating Outputs
s Comes in Standard 5-Pin Packages
s Can be Externally Synchronized (Consult Factory)
U
APPLICATIONS
s Logic Supply 5V at 10A
s 5V Logic to ±15V Op Amp Supply
s Off-Line Converter Up to 200W
s Battery Upconverter
s Power Inverter (+ to –) or (– to +)
s Fully Floating Multiple Outputs
s For Lower Current Applications, See the LT1072
USER NOTE:
This data sheet is only intended to provide specifications, graphs and a general functional
description of the LT1070/LT1071. Application circuits are included to show the capability of the
LT1070/LT1071. A complete design manual (AN19) 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 LT1071 by factoring in the lower switch current
rating. A second Application Note, AN25, which details off-line applications is available.
LT1070/LT1071
5A and 2.5A High Efficiency
Switching Regulators
DESCRIPTION
The LT®1070/LT1071 are monolithic high power switch-
ing regulators. They can be operated in all standard switch-
ing configurations including buck, boost, flyback, for-
ward, inverting and “Cuk”. A high current, high efficiency
switch is included on the die along with all oscillator,
control and protection circuitry. Integration of all func-
tions allows the LT1070/LT1071 to be built in a standard
5-pin TO-3 or T0-220 power package. This makes it ex-
tremely easy to use and provides “bust proof” operation
similar to that obtained with 3-pin linear regulators.
The LT1070/LT1071 operate with supply voltages from 3V
to 60V, and draw only 6mA quiescent current. They can
deliver load power up to 100W with no external power
devices. By utilizing current mode switching techniques,
they provide excellent AC and DC load and line regulation.
The LT1070/LT1071 have many unique features not found
even on the vastly more difficult to use low power control
chips presently available. They use adaptive antisat switch
drive to allow very wide ranging load currents with no loss
in efficiency. An externally activated shutdown mode
reduces total supply current to 50µA typical for standby
operation. Totally isolated and regulated outputs can be
generated by using the optional “flyback regulation mode”
built into the LT1070/LT1071, without the need for
optocouplers or extra transformer windings.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Boost Converter (5V to 12V)
L2
10µH
5V L1**
150µH
OUTPUT
FILTER
C3
100µF
+
C3*
100µF
VIN VSW
LT1070
GND VC FB
D1
+
R3
1k
C1
1µF
*REQUIRED IF INPUT LEADS ≥ 2"
**PULSE ENGINEERING 92113
C2
1000µF
R1
10.7k
1%
12V
1A
R2
1.24k
1%
1070/71 TA01
Maximum Output Power*
100
80
BOOST
60
BUCK/BOOST
VO = 30V
FLYBACK
40
ISOLATED
20
BUCK/BOOST
VO = 5V
0
0 10 20 30 40 50
INPUT VOLTAGE (V)
1070/71 TA02
*ROUGH GUIDE ONLY. BUCK MODE POUT = 5A • VOUT.
SPECIAL TOPOLOGIES DELIVER MORE POWER
**DIVIDE VERTICAL POWER SCALE BY 2 FOR LT1071
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LT1070/LT1071
Driver Current* vs Switch Current
160
140
120
100
80
TJ = – 55°C
60
TJ ≥ 25°C
40
20
0
012345
SWITCH CURRENT (A)
1070/71 G10
*AVERAGE LT1070 POWER SUPPLY CURRENT IS
FOUND BY MULTIPLYING DRIVER CURRENT BY
DUTY CYCLE, THEN ADDING QUIESCENT CURRENT
Supply Current vs Input Voltage*
16
TJ = 25°C
15
90% DUTY CYCLE
14
13 ISWITCH ≤ 10mA
12
11
50% DUTY CYCLE
10
9
10% DUTY CYCLE
8
7 0% DUTY CYCLE
6
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
1070/71 G11
*UNDER VERY LOW OUTPUT CURRENT
CONDITIONS, DUTY CYCLE FOR MOST
CIRCUITS WILL APPROACH 10% OR LESS
Supply Current vs Supply Voltage
(Shutdown Mode)
160
TJ = 25°C
140
120
100
VC = 50mV
80
60
40
20 VC = 0V
0
0 10 20 30 40 50 60
SUPPLY VOLTAGE (V)
1070/71 G12
Normal/Flyback Mode Threshold
on Feedback Pin
500 –24
490 –22
480 –20
470
FEEDBACK PIN VOLTAGE
460 (AT THRESHOLD)
450
– 18
– 16
–1 4
440 –12
430 –10
FEEDBACK PIN CURRENT
420
(AT THRESHOLD)
–8
410 – 6
400 – 4
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1070/71 G13
Shutdown Thresholds
400
350 CURRENT
(OUT OF VC PIN)
300
– 400
– 350
– 300
250 –250
200 –200
VOLTAGE
150 –150
100 –100
VC VOLTAGE IS REDUCED UNTIL
50 REGULATOR CURRENT DROPS
– 50
BELOW 300µA
00
– 75 – 50 – 25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1070/71 G16
Shutdown Mode Supply Current
200
180
160
140
120
TJ = 150°C
100
80
60
– 55°C ≤ TJ ≤ 125°C
40
20
0
0 10 20 30 40 50 60 70 80 90 100
VC PIN VOLTAGE (mV)
1070/71 G14
Idle Supply Current
vs Temperature
11
VC = 0.6V
10
9
8
7 VSUPPLY = 60V
6
VSUPPLY = 3V
5
4
3
2
1
–75 – 50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1070/71 G14
Error Amplifier Transconductance
5000
4500
4000
gm
=
∆I
∆V
(VC PIN)
(FB PIN)
3500
3000
2500
2000
1500
1000
500
0
–75 – 50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1070/71 G14
Feedback Pin Clamp Voltage
500
450
400
– 55°C
350
300 25°C
250
150°C
200
150
100
50
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
FEEDBACK CURRENT (mA)
1070/71 G18
5
5 Page 
LT1070/LT1071
TYPICAL APPLICATIONS (Note that maximum output currents are divided by 2 for the LT1071)
Flyback Converter
VIN
20V TO 30V
R4
+
C4*
100µF
VIN
VSW
LT1070
FB
GND VC
R3
1.5k
C2
0.15µF
*REQUIRED IF INPUT LEADS ≥ 2"
L2
10µH
OPTIONAL
FILTER
C4
200µF
D1
C3
0.47µF
•
1
N
D2 •
+
C1
2000µF
VOUT
5V
6A
N = 1/3
R1
3.74k
VIN
0V
0V
0
0
R2
1.24k
0
VSNUB
CLAMP TURN-ON
SPIKE
a
PRIMARY
FLYBACK
VOLTAGE
=
VOUT +
N
VF
b
VOUT + VF
LT1070/LT1071 SWITCH VOLTAGE
AREA “a” = AREA “b” TO MAINTAIN
ZERO DC VOLTS ACROSS PRIMARY
c
d
(N)(VIN)
SECONDARY VOLTAGE
AREA “c” = AREA “d” TO MAINTAIN
ZERO DC VOLTS ACROSS SECONDARY
∆I
IPRI
IPRI N
IPRI
PRIMARY CURRENT
SECONDARY CURRENT
LT1070 SWITCH CURRENT
IPRI
t
=
(IPRI)(LL)
VSNUB
SNUBBER DIODE CURRENT
1070/71 TA08
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
K Package
4-Lead TO-3 Metal Can
(LTC DWG # 05-08-1311)
T Package
5-Lead Plastic TO-220 (Standard)
(LTC DWG # 05-08-1421)
0.320 – 0.350
(8.13 – 8.89)
0.420 – 0.480
(10.67 – 12.19)
0.760 – 0.775
(19.30 – 19.69)
0.060 – 0.135
(1.524 – 3.429)
0.038 – 0.043
(0.965 – 1.09)
1.177 – 1.197
(29.90 – 30.40)
0.470 TP
P.C.D.
0.655 – 0.675
(16.64 – 19.05)
0.151 – 0.161
(3.84 – 4.09)
DIA 2 PLC
72°
18°
0.167 – 0.177
(4.24 – 4.49)
R
0.495 – 0.525
(12.57 – 13.34)
R
K4(TO-3) 0695
0.390 – 0.415
(9.906 – 10.541)
0.460 – 0.500
(11.684 – 12.700)
0.057 – 0.077
(1.448 – 1.956)
0.147 – 0.155
(3.734 – 3.937)
DIA
0.165 – 0.180
(4.191 – 4.572)
0.230 – 0.270
(5.842 – 6.858)
0.570 – 0.620
(14.478 – 15.748)
0.620
(15.75)
0.330 – 0.370
(8.382 – 9.398)
TYP
0.700 – 0.728
(17.78 – 18.491)
0.152 – 0.202
0.260 – 0.320 (3.861 – 5.131)
(6.60 – 8.13)
0.028 – 0.038
(0.711 – 0.965)
0.135 – 0.165
(3.429 – 4.191)
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.
0.045 – 0.055
(1.143 – 1.397)
0.095 – 0.115
(2.413 – 2.921)
0.013 – 0.023
(0.330 – 0.584)
0.155 – 0.195
(3.937 – 4.953)
T5 (TO-220) 0398
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1070HVMK.PDF ] | |
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