Rainbow-electronics MAX5974D Bedienungsanleitung PDF herunterladen (Seite 7)

MAX5974A/MAX5974B/MAX5974C/MAX5974D

Active-Clamped, Spread-Spectrum,

Current-Mode PWM Controllers

7

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.)

SOFT-START CHARGING CURRENT

vs. TEMPERATURE

MAX5974A/B/C/D toc10

TEMPERATURE (°C)

SOFT-START CHARGING CURRENT (µA)

603510-15

9.98

9.99

10.00

10.01

10.02

10.03

10.04

10.05

10.06

9.97

-40 85

SWITCHING FREQUENCY

vs. R

RT

VALUE

MAX5974A/B/C/D toc11

R

RT

VALUE (kΩ)

SWITCHING FREQUENCY (kHz)

100

1000

10

10010

SWITCHING FREQUENCY

vs. TEMPERATURE

MAX5974A/B/C/D toc12

TEMPERATURE (°C)

SWITCHING FREQUENCY (kHz)

6035-15 10

245

246

247

248

250

249

251

252

244

-40 85

FREQUENCY DITHERING

vs. R

DITHER

MAX5974A/B/C/D toc13

R

DITHER

(kΩ)

FREQUENCY DITHERING (%)

900800700600500400

2

4

6

8

10

12

14

0

300 1000

MAXIMUM DUTY CYCLE

vs. SWITCHING FREQUENCY

MAX5974A/B/C/D toc14

SWITCHING FREQUENCY (kHz)

MAXIMUM DUTY CYCLE (%)

700600100 200 300 400 500

76

77

78

79

80

81

82

83

75

0 800

MAXIMUM DUTY CYCLE

vs. TEMPERATURE

MAX5974A/B/C/D toc15

TEMPERATURE (°C)

MAXIMUM DUTY CYCLE (%)

6035-15 10

80.3

80.4

80.5

80.6

80.8

80.7

80.9

81.0

80.2

-40 85

MAXIMUM DUTY CYCLE

vs. SYNC FREQUENCY

MAX5974A/B/C/D toc16

SYNC FREQUENCY (kHz)

MAXIMUM DUTY CYCLE (%)

450400350300

5

10

15

20

25

30

35

40

45

0

250 500

V

SS

= 0.5V

MAXIMUM DUTY CYCLE

vs. V

SS

MAX5974A/B/C/D toc17

V

SS

(V)

MAXIMUM DUTY CYCLE (%)

2.01.51.00.5

10

20

30

40

50

60

70

80

90

100

0

0 2.5

MAXIMUM DUTY CYCLE

vs. V

DCLMP

MAX5974A/B/C/D toc18

V

DCLMP

(V)

MAXIMUM DUTY CYCLE (%)

2.01.51.00.5

10

20

30

40

50

60

70

80

90

100

0

0 2.5

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

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