Rainbow-electronics MAX5974D Manual de usuario descargar pdf (Pagina 8)

MAX5974A/MAX5974B/MAX5974C/MAX5974D

Active-Clamped, Spread-Spectrum,

Current-Mode PWM Controllers

8

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.)

DEAD TIME vs. R

DT

VALUE

MAX5974A/B/C/D toc19

R

DT

VALUE (kΩ)

DEAD TIME (ns)

908020 30 40 6050 70

50

100

150

200

250

300

350

400

0

10 100

DEAD TIME vs. TEMPERATURE

MAX5974A/B/C/D toc20

TEMPERATURE (°C)

DEAD TIME (ns)

11085603510-15

90

92

94

96

98

100

102

88

-40

PEAK CURRENT-LIMIT THRESHOLD

vs. TEMPERATURE

MAX5974A/B/C/D toc21

TEMPERATURE (°C)

PEAK CURRENT-LIMIT THRESHOLD (mV)

603510-15

389

390

391

392

393

394

395

396

397

398

388

-40 85

REVERSE CURRENT-LIMIT THRESHOLD

vs. TEMPERATURE

MAX5974A/B/C/D toc22

TEMPERATURE (°C)

REVERSE CURRENT-LIMIT THRESHOLD (mV)

603510-15

-106

-105

-104

-103

-102

-101

-100

-99

-98

-97

-107

-40 85

SLOPE COMPENSATION CURRENT

vs. TEMPERATURE

MAX5974A/B/C/D toc23

TEMPERATURE (°C)

SLOPE COMPENSATION CURRENT (mA)

6035-15 10

50.5

51.0

51.5

52.0

53.0

52.5

53.5

54.0

50.0

-40 85

NDRV MINIMUM ON-TIME

vs. TEMPERATURE

MAX5974A/B/C/D toc24

TEMPERATURE (°C)

NDRV MINIMUM ON-TIME (ns)

603510-15

145

150

155

160

165

170

140

-40 85

CURRENT-SENSE GAIN

vs. TEMPERATURE

MAX5974A/B/C/D toc25

TEMPERATURE (°C)

CURRENT-SENSE GAIN (V/V)

603510-15

3.31

3.32

3.33

3.34

3.35

3.36

3.37

3.38

3.39

3.40

3.30

-40 85

FEEDBACK VOLTAGE

vs. TEMPERATURE

MAX5974A/B/C/D toc26

TEMPERATURE (°C)

FEEDBACK VOLTAGE (V)

603510-15

1.211

1.212

1.213

1.214

1.215

1.216

1.217

1.218

1.219

1.220

1.210

-40 85

MAX5974C/MAX5974D

FEEDBACK VOLTAGE

vs. TEMPERATURE

MAX5974A/B/C/D toc27

TEMPERATURE (°C)

FEEDBACK VOLTAGE (V)

603510-15

1.517

1.518

1.519

1.520

1.521

1.522

1.516

-40 85

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