LT1071_15 Datasheet, PDF (11/12 Pages) Linear Technology – 5A and 2.5A High Efficiency Switching Regulators

LT1070/LT1071
TYPICAL APPLICATIONS (Note that maximum output currents are divided by 2 for the LT1071)
Flyback Converter
V_IN
20V TO 30V
R4
+
C4*
100µF
V_IN
V_SW
LT1070
FB
GND V_C
R3
1.5k
C2
0.15µF
*REQUIRED IF INPUT LEADS ≥ 2"
L2
10µH
V_IN
OPTIONAL
C4
FILTER
200µF
0V
D1
C3
0.47µF
•
1
N
+
C1
V_OUT
5V
6A
0V
2000µF
D2
•
N = 1/3
R1
0
3.74k
0
R2
1.24k
0
V_SNUB
CLAMP TURN-ON
SPIKE
a
PRIMARY
FLYBACK
VOLTAGE
=
V_OUT +
N
V_F
b
V_OUT + V_F
LT1070/LT1071 SWITCH VOLTAGE
AREA “a” = AREA “b” TO MAINTAIN
ZERO DC VOLTS ACROSS PRIMARY
c
d
(N)(V_IN)
SECONDARY VOLTAGE
AREA “c” = AREA “d” TO MAINTAIN
ZERO DC VOLTS ACROSS SECONDARY
∆I
I_PRI
I_PRI N
I_PRI
PRIMARY CURRENT
SECONDARY CURRENT
LT1070 SWITCH CURRENT
I_PRI
t
=
(I_PRI)(L_L)
V_SNUB
SNUBBER DIODE CURRENT
1070/71 TA08
PACKAGE DESCRIPTION
K Package
4-Lead TO-3 Metal Can
(Reference LTC DWG # 05-08-1311)
0.320 – 0.350
(8.13 – 8.89)
0.760 – 0.775
(19.30 – 19.69)
0.060 – 0.135
(1.524 – 3.429)
0.420 – 0.480
(10.67 – 12.19)
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
0.490 – 0.510
(12.45 – 12.95)
R
K4(TO-3) 1098
OBSOLETE PACKAGE
0.390 – 0.415
(9.906 – 10.541)
0.460 – 0.500
(11.684 – 12.700)
BSC ^0.067
(1.70)
T Package
5-Lead Plastic TO-220 (Standard)
(Reference LTC DWG # 05-08-1421)
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)
0.045 – 0.055
(1.143 – 1.397)
SEATING PLANE
0.152 – 0.202
0.260 – 0.320 (3.861 – 5.131)
(6.60 – 8.13)
0.095 – 0.115
(2.413 – 2.921)
0.155 – 0.195*
(3.937 – 4.953)
0.028 – 0.038
(0.711 – 0.965)
0.135 – 0.165
(3.429 – 4.191)
0.013 – 0.023
(0.330 – 0.584)
T5 (TO-220) 0399
* MEASURED AT THE SEATING PLANE
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.
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