Rainbow-electronics MAX5974D Bedienungsanleitung PDF herunterladen (Seite 5)

MAX5974A/MAX5974B/MAX5974C/MAX5974D

Active-Clamped, Spread-Spectrum,

Current-Mode PWM Controllers

ELECTRICAL CHARACTERISTICS (continued)

= 12V (for MAX5974A/MAX5974C, bring V

up to 21V for startup), V

= V

CSSC

= V

DITHER/SYNC

= V

FFB

= V

DCLMP

GND

, V

= +2V, NDRV = AUXDRV = SS = COMP = unconnected, R

= 34.8kI, R

= 25kI, C

= 1FF, T

= -40NC to +85NC,

unless otherwise noted. Typical values are at T

= +25NC.) (Note 2)

Note 2: All devices are 100% production tested at T

= +25NC. Limits over temperature are guaranteed by design.

Note 3: See the Output Short-Circuit Protection with Hiccup Mode section.

Note 4: The parameter is measured at the trip point of latch with V

= 0V. Gain is defined as DV

COMP

/DV

CSSC

for 0.15V <

CSSC

< 0.25V.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ERROR AMPLIFIER

FB Reference Voltage V

REF

when I

COMP

= 0,

COMP

= 2.5V

MAX5974A/

MAX5974B

1.5 1.52 1.54

MAX5974C/

MAX5974D

1.202 1.215 1.227

FB Input Bias Current I

= 0 to 1.75V

MAX5974A/

MAX5974B

-250 +250

MAX5974C/

MAX5974D

-500 +100

Voltage Gain A

EAMP

80 dB

Transconductance g

MAX5974A/

MAX5974B

1.8 2.55 3.2

MAX5974C/

MAX5974D

1.8 2.66 3.5

Transconductance Bandwidth BW

Open loop (typical gain

= 1) -3dB frequency

MAX5974A/

MAX5974B

MHz

MAX5974C/

MAX5974D

Source Current V

= 1V, V

COMP

= 2.5V 300 375 455

Sink Current V

= 1.75V, V

COMP

= 1V 300 375 455

FREQUENCY FOLDBACK (FFB)

CSAVG

-to-FFB Comparator

Gain

10 V/V

FFB Bias Current I

FFB

= 0V, V

= 0V (not in FFB mode) 26 30 33

NDRV Switching Frequency

During Foldback

SW-FB

/2 kHz

1 2 3 4 5 6 7 8 9 10 ... 25 26

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