LT1071 Linear Technology, LT1071 Datasheet - Page 11

• Manufacturer Part Number: LT1071
• Description: 5A and 2.5A High Efficiency Switching Regulators
• Manufacturer: Linear Technology

PACKAGE
TYPICAL APPLICATIONS
+
(10.67 – 12.19)
0.320 – 0.350
0.420 – 0.480
(8.13 – 8.89)
*REQUIRED IF INPUT LEADS 2"
20V TO 30V
C4*
100 F
V
IN
GND
4-Lead TO-3 Metal Can
(LTC DWG # 05-08-1311)
LT1070
DESCRIPTION
V
IN
(19.30 – 19.69)
(29.90 – 30.40)
0.760 – 0.775
1.177 – 1.197
V
K Package
18
V
C
SW
FB
R3
1.5k
C2
0.15 F
(0.965 – 1.09)
0.038 – 0.043
72
0.470 TP
P.C.D.
R4
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.
D2
(1.524 – 3.429)
C3
0.47 F
0.060 – 0.135
(16.64 – 19.05)
0.655 – 0.675
(12.57 – 13.34)
U
0.495 – 0.525
0.167 – 0.177
(4.24 – 4.49)
U
0.151 – 0.161
R
(3.84 – 4.09)
•
DIA 2 PLC
R
1 N
K4(TO-3) 0695
(Note that maximum output currents are divided by 2 for the LT1071)
Dimensions in inches (millimeters) unless otherwise noted.
•
N = 1/3
D1
OPTIONAL
FILTER
+
10 H
L2
Flyback Converter
C1
2000 F
(9.906 – 10.541)
(11.684 – 12.700)
0.390 – 0.415
0.460 – 0.500
(1.448 – 1.956)
0.057 – 0.077
C4
200 F
R1
3.74k
R2
1.24k
V
5V
6A
OUT
V
0V
0V
IN
0
0
0
5-Lead Plastic TO-220 (Standard)
I
a
c
PRI
I
t =
V
(0.711 – 0.965)
0.028 – 0.038
SNUB
(5.842 – 6.858)
(8.382 – 9.398)
(I
0.230 – 0.270
0.330 – 0.370
(LTC DWG # 05-08-1421)
0.260 – 0.320
(6.60 – 8.13)
b
d
PRI
V
SNUB
V
OUT
)(L
(3.734 – 3.937)
I
I
0.147 – 0.155
PRI
PRI
L
)
+ V
CLAMP TURN-ON
T Package
(14.478 – 15.748)
DIA
I
0.570 – 0.620
(N)(V
F
PRI
(3.861 – 5.131)
0.152 – 0.202
SPIKE
N
IN
)
(17.78 – 18.491)
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
SECONDARY CURRENT
LT1070 SWITCH CURRENT
SNUBBER DIODE CURRENT
0.700 – 0.728
(3.429 – 4.191)
0.135 – 0.165
LT1070/LT1071
(4.191 – 4.572)
0.165 – 0.180
(15.75)
0.620
TYP
1070/71 TA08
V
(3.937 – 4.953)
(0.330 – 0.584)
0.155 – 0.195
T5 (TO-220) 0398
OUT
0.013 – 0.023
(2.413 – 2.921)
0.095 – 0.115
(1.143 – 1.397)
11
0.045 – 0.055
N
+ V
F