10701fe

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.

T5 (TO-220) 0399

0.028 – 0.038

(0.711 – 0.965)

0.067

(1.70)

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)

BSC

SEATING PLANE

* MEASURED AT THE SEATING PLANE

K4(TO-3) 1098

72

°

18

°

0.490 – 0.510

(12.45 – 12.95)

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

C2

0.15

µF

R3

1.5k

R1

3.74k

R2

1.24k

C4*

100

µF

20V TO 30V

5V

6A

LT1070

GND

FB

C3

0.47

µF

C1

2000

µF

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

N

0V

CLAMP TURN-ON

SPIKE

C4

200

µF

L2

10

µH

OPTIONAL

FILTER

c

∆I

d

0V

0

LT1070 SWITCH CURRENT

SNUBBER DIODE CURRENT

t =

SECONDARY CURRENT

0

0

N = 1/3

OBSOLETE PACKAGE

T Package

5-Lead Plastic TO-220 (Standard)

(Reference LTC DWG # 05-08-1421)

K Package

4-Lead TO-3 Metal Can

(Reference LTC DWG # 05-08-1311)