Rainbow-electronics MAX5974D Manual de usuario descargar pdf (Pagina 9)

MAX5974A/MAX5974B/MAX5974C/MAX5974D

Active-Clamped, Spread-Spectrum,

Current-Mode PWM Controllers

9

Typical Operating Characteristics (continued)

(V

IN

= 12V (for MAX5974A/MAX5974C, bring V

IN

up to 21V for startup), V

CS

= V

CSSC

= V

DITHER/SYNC

= V

FB

= V

FFB

= V

DCLMP

=

V

GND

, V

EN

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

RT

= 34.8kI, R

DT

= 25kI, unless otherwise noted.)

TRANSCONDUCTANCE

vs. TEMPERATURE

MAX5974A/B/C/D toc28

TEMPERATURE (°C)

TRANSCONDUCTANCE (mS)

603510-15

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

3.0

2.0

-40 85

MAX5974C/MAX5974D

MAX5974A/MAX5974B

TRANSCONDUCTANCE HISTOGRAM

(MAX5974A/MAX5974B)

MAX5974A/B/C/D toc29

TRANSCONDUCTANCE (mS)

N (%)

2.642.622.602.582.562.542.522.502.482.46

5

10

15

20

25

0

2.44

TRANSCONDUCTANCE HISTOGRAM

(MAX5974C/MAX5974D)

MAX5974A/B/C/D toc30

TRANSCONDUCTANCE (mS)

N (%)

2.762.742.722.702.682.662.642.622.602.58

5

10

15

20

25

0

2.56

ENABLE RESPONSE

MAX5974A/B/C/D toc31

1ms/div

V

EN

2V/div

V

NDRV

20V/div

V

AUXDRV

20V/div

V

OUT

5V/div

MAX5974C

SHUTDOWN RESPONSE

MAX5974A/B/C/D toc32

4µs/div

V

EN

2V/div

V

NDRV

10V/div

V

AUXDRV

10V/div

V

OUT

5V/div

SHUTDOWN RESPONSE

MAX5974A/B/C/D toc33

100µs/div

V

EN

2V/div

V

NDRV

10V/div

V

AUXDRV

10V/div

V

OUT

5V/div

V

SS

RAMP RESPONSE

MAX5974A/B/C/D toc34

10µs/div

V

SS

2V/div

V

NDRV

10V/div

V

AUXDRV

10V/div

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 25 26

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