LT1270ACT datasheet(3/4 Pages) LINER

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LT1270A/LT1270

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ILIM

Switch Current Limit (LT1270)

Duty Cycle = 50%, TJ ≤ 100°C

816

(Note 3)

Duty Cycle = 80%, TJ ≤ 100°C

614

ILIM

Switch Current Limit (LT1270A)

Duty Cycle = 50%, TJ ≤ 100°C

10.0

16.0

(Note 3)

Duty Cycle = 80%, TJ ≤ 100°C

7.5

14.0

∆IIN

Supply Current Increase

mA/A

∆ISW

During Switch-ON Time

Switching Frequency

kHz

DCMAX

Maximum Switch Duty Cycle

Flyback Sense Delay Time

1.5

µs

Shutdown Mode Supply Current

≤ VIN ≤ VMAX, VC = 0.05V

100

400

µA

Shutdown Mode Threshold Voltage

≤ VIN ≤ VMAX

100

150

250

300

ELECTRICAL CHARACTERISTICS V

IN = 15V, VC = 0.5V, VFB = VREF, switch pin open, unless otherwise noted.

The q denotes specifications which apply over the full operating

temperature range.

Note 1: Measured with VC in Hi Clamp, VFB = 0.8V.

Note 2: For duty cycles (DC) between 50% and 80%, minimum guaranteed

switch current is given by ILIM = 6.67 (1.7 – DC) for the LT1270 and ILIM =

8.33 (1.7 – DC) for the LT1270A.

Note 3: Minimum current limit is reduced by 0.5A at 125

°C. 100°C test

limits are guaranteed by correlation to 125

°C tests.

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 circuits as described herein will not infringe on existing patent rights.

HARA TERISTICS

TYPICALPERFOR

Switch Saturation Voltage

Switch Current Limit vs Duty Cycle

DUTY CYCLE (%)

1.8

2.4

LT1270 • TA03

1.2

100

–55°C

125°C

25°C

SWITCH CURRENT (A)

1.2

1.6

LT1270 • TA04

0.8

0.4

TJ = 25°C

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