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LT1071CT

Part # LT1071CT
Description IC REG MULT CONFIG INV ADJ TO220
Category IC
Availability In Stock
Qty 2
Qty Price
1 + $2.55601
Manufacturer Available Qty
Linear Technology
Date Code: 8815
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

10
LT1070/LT1071
TYPICAL APPLICATIONS
U
(Note that maximum output currents are divided by 2 for the LT1071)
Current Boosted Boost Converter
+
R4
1070/71 TA11
R3
R2
1.24k
R1
27k
C2
C3
I
N
C1
V
OUT
28V
4A
D2
D1
V
SW
V
C
V
IN
LT1070
GND
V
IN
16V TO 24V
FB
+
R1
27k
R
O
(MINIMUM
LOAD)
R2
1.24k
1070/71 TA15
R3
3.3k
C2
0.22µF
C3
10µF
+
+
C1
1000µF
+
C4*
470µF
V
IN
–15V
V
OUT
–28V
1A
L1
200µH
D2
D1
V
SW
V
C
V
IN
LT1070
GND
FB
*REQUIRED IF INPUT LEADS ≥ 2"
+
R4
680Ω
1W
1070/71 TA10
1
L1
N = 5
TOTAL 
INDUCTANCE = 4mH
INTERLEAVE PRIMARY 
AND SECONDARY FOR 
LOW LEAKAGE
INDUCTANCE
R3
10k
R2
1.24k
R1
98k
C2
0.047µF
C3
0.68µF
C1
200µF
V
OUT
100V
300mA
D2
D1
V
SW
V
C
V
IN
LT1070
GND
V
IN
15V
FB
+
Voltage Boosted Boost Converter
Negative Boost Regulator
Negative Input/Negative Output Flyback Converter
+
R5
R4
1.24k
C2
V
SW
Q1
2N3906
•
•
V
IN
C3
C1
–V
OUT
1070/71 TA17
R6
R1*
T1
1:N
LT1070/LT1071
GND V
C
FB
–V
IN
R3
1k
R2
5k
+
*R1 =
V
OUT
– 1.6V
200µA
External Current Limit
External Current Limit
1070/71 TA04
LT1070/LT1071
V
C
GND
D1
V
X
R1
500Ω
R2
= 2V
1070/71 TA06
R2
V
IN
R1
1k
C2
C1
1000pF
NOTE THAT THE LT1070/LT1071
GND PIN IS NO LONGER COMMON
TO V
IN
–
V
SW
V
C
R
S
V
IN
LT1070/LT1071
GND
FB
+
Q1
11
LT1070/LT1071
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.
TYPICAL APPLICATIONS
U
(Note that maximum output currents are divided by 2 for the LT1071)
T5 (TO-220) 0398
0.028 – 0.038
(0.711 – 0.965)
0.057 – 0.077
(1.448 – 1.956)
0.135 – 0.165
(3.429 – 4.191)
0.700 – 0.728
(17.78 – 18.491)
0.045 – 0.055
(1.143 – 1.397)
0.095 – 0.115 
(2.413 – 2.921)
0.013 – 0.023
(0.330 – 0.584)
0.620
(15.75)
TYP
0.155 – 0.195
(3.937 – 4.953)
0.152 – 0.202
(3.861 – 5.131)
0.260 – 0.320
(6.60 – 8.13)
0.165 – 0.180
(4.191 – 4.572)
0.147 – 0.155
(3.734 – 3.937)
DIA
0.390 – 0.415
(9.906 – 10.541)
0.330 – 0.370
(8.382 – 9.398)
0.460 – 0.500
(11.684 – 12.700)
0.570 – 0.620
(14.478 – 15.748)
0.230 – 0.270
(5.842 – 6.858)
K4(TO-3) 0695
72°
18°
0.495 – 0.525
(12.57 – 13.34)
R
0.470 TP
P.C.D.
0.167 – 0.177
(4.24 – 4.49)
R
0.151 – 0.161
(3.84 – 4.09)
DIA 2 PLC
0.655 – 0.675
(16.64 – 19.05)
1.177 – 1.197
(29.90 – 30.40)
0.038 – 0.043
(0.965 – 1.09)
0.060 – 0.135
(1.524 – 3.429)
0.320 – 0.350
(8.13 – 8.89)
0.420 – 0.480
(10.67 – 12.19)
0.760 – 0.775
(19.30 – 19.69)
Flyback Converter
1070/71 TA08
*REQUIRED IF INPUT LEADS ≥ 2"
a
b
V
SNUB
C2
0.15µF
R3
1.5k
R1
3.74k
R2
1.24k
C4*
100µF
V
IN
20V TO 30V
V
OUT
5V
6A
V
SW
V
C
V
IN
LT1070
GND
FB
C3
0.47µF
C1
2000µF
D2
D1
R4
1N
•
•
+
+
PRIMARY FLYBACK VOLTAGE =
LT1070/LT1071 SWITCH VOLTAGE
AREA “a” = AREA “b” TO MAINTAIN
ZERO DC VOLTS ACROSS PRIMARY
SECONDARY VOLTAGE
AREA “c” = AREA “d” TO MAINTAIN
ZERO DC VOLTS ACROSS SECONDARY
PRIMARY CURRENT
V
OUT
+ V
F
N
0V
V
IN
CLAMP TURN-ON
SPIKE
C4
200µF
L2
10µH
OPTIONAL
FILTER
c
∆I
d
V
OUT
+ V
F
(N)(V
IN
)
I
PRI
0V
0
LT1070 SWITCH CURRENT
SNUBBER DIODE CURRENT
I
PRI
I
PRI
t =
(I
PRI
)(L
L
)
V
SNUB
SECONDARY CURRENT
I
PRI
N
0
0
N = 1/3
PACKAGE DESCRIPTION
U
Dimensions in inches (millimeters) unless otherwise noted.
T Package
5-Lead Plastic TO-220 (Standard)
(LTC DWG # 05-08-1421)
K Package
4-Lead TO-3 Metal Can
(LTC DWG # 05-08-1311)
12
LT1070/LT1071
10701fd LT/TP 1098 2K REV D • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1989
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear-tech.com
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1074/LT1076 High Voltage Switching Regulators 40V Input (60V for HV Versions), 100kHz, 5A and 2A
LT1170/LT1171/ 100kHz High Efficiency Switching Regulators 40V Input (65V for HV Versions), 5A/2.5A/1.25A Internal Switch
LT1172
LT1370/LT1371 500kHz High Efficiency Switching Regulators 35V, 6A/3A Internal Switch
LT1374/LT1376 100kHz High Efficiency Switching Regulators 25V Input, 4.5A/1.5A Internal Switch
Forward Converter
Totally Isolated Converter
1070/71 TA07
R4
1.5k
5k
500Ω
N = 0.875 = 7:8
FOR V
OUT
= 15V
*REQUIRED IF INPUT LEADS ≥ 2"
R2
SECONDARY VOLTAGE
0V
V
OUT
t
OFF
t
ON
≈16V
(N)(V
IN
)
C2
0.01µF
C5*
100µF
V
IN
5V
V
SW
V
C
V
IN
LT1070/LT1071
GND
FB
+
C3
0.47µF
N
D1
1:N
•
•
N
+
L1
10µF
L2
10µF
15V
COM
+
C4
500µF
C1
500µF
+
+
C6
200µF
C5
200µF
OPTIONAL
OUTPUT FILTER
+
–15V
SWITCH VOLTAGE
V
F
(DIODE FORWARD VOLTAGE)
0V
V
IN
+
R3
R6
330Ω
R5
1Ω
Q1
C3
C4
V
SW
L1
70µH
•
••
V
IN
C2
D3
C1
2000µF
D1
V
OUT
5V
6A
R4
T1
LT1070
GND V
C
FB
V
IN
20V TO 30V
D4
IMN
D2
1070/71 TA18
R1
3.74k
R2
1.24k
TYPICAL APPLICATIONS
U
(Note that maximum output currents are divided by 2 for the LT1071)
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