LT1074CK datasheet(4/16 Pages) LINER

4 / 16 page

LT1074/LT1076

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: To calculate maximum switch “on” voltage at currents between

low and high conditions, a linear interpolation may be used.

Note 3: A feedback pin voltage (VFB) of 2.5V forces the VC pin to its low

clamp level and the switch duty cycle to zero. This approximates the zero

load condition where duty cycle approaches zero.

Note 4: Total voltage from VIN pin to ground pin must be ≥ 8V after start-

up for proper regulation.

Note 5: Switch frequency is internally scaled down when the feedback pin

voltage is less than 1.3V to avoid extremely short switch on times. During

testing, VFB is adjusted to give a minimum switch on time of 1µs.

Note 6: ILIM ≈

(LT1074)

, ILIM ≈

(LT1076).

Note 7: Switch to input voltage limitation must also be observed.

Note 8: VMAX = 40V for the LT1074/76 and 60V for the LT1074HV/76HV.

Note 9: Does not include switch leakage.

RLIM – 1k

5.5k

ELECTRICAL CHARACTERISTICS

REGULATOR

AND BIAS

–

-POWER

SHUTDOWN

10 A

320 A

–

2.35V

0.3V

CURRENT

LIMIT

SHUTDOWN

4.5V

10k

–

CURRENT

LIMIT

COMP

400

–

R/S

LATCH

–

ERROR

AMP

100kHz

OSCILLATOR

ANALOG

MULTIPLIER

FREQ SHIFT

SYNC

PULSE WIDTH

COMPARATOR

24V (EQUIVALENT)

2.21V

SWITCH

OUTPUT

)

0.04

250

500

INPUT SUPPLY

SHUTDOWN*

6V TO ALL

CIRCUITRY

LIM

Ω

VIN

LT1074 • BD01

100

SWITCH

OUTPUT (V

)

0.1

Ω

3V(p-p)

LT1076

LT1074

*AVAILABLE ON PACKAGES WITH PIN

COUNTS GREATER THAN 5.

BLOCK DIAGRA

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