Rainbow-electronics MAX5074 Bedienungsanleitung PDF herunterladen (Seite 6)

MAX5074

Power IC with Integrated MOSFETs for Isolated IEEE

802.3af PD and Telecom Power-Supply Applications

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

HVIN

= 48V, V

INBIAS

= 15V, C

INBIAS

= 1µF, C

REGOUT

= 2.2µF, R

RTCT

= 25kΩ, C

RTCT

= 100pF, C

BST

= 0.22µF, V

CSS

= V

= 0V,

RAMP

= V

UVLO

= 3V, T

= T

= -40°C to +125°C, unless otherwise noted. Typical values are at T

= +25°C, unless otherwise noted.)

OPERATING FREQUENCY

vs. TEMPERATURE

MAX5074 toc12

TEMPERATURE (°C)

OPERATING FREQUENCY (kHz)

11095-25 -10 5 35 50 6520 80

250

300

350

400

450

500

550

600

200

-40 125

RTCT

= 12kΩ

RTCT

= 100pF

RTCT

= 25kΩ

RTCT

= 100pF

SOFT-START CURRENT

vs. TEMPERATURE

MAX5074 toc13

TEMPERATURE (°C)

SOFT-START CURRENT (µA)

11095-25 -10 5 35 50 6520 80

31.25

31.50

31.75

32.00

32.25

32.50

32.75

33.00

31.00

-40 125

MINIMUM RCFF AND OPTO LEVELS

vs. TEMPERATURE

MAX5074 toc14

TEMPERATURE (°C)

RCFF

(V), V

OPTO

(V)

11095-25 -10 5 35 50 6520 80

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

1.00

-40 125

OPTO

RCFF

CURRENT-LIMIT COMPARATOR

THRESHOLD vs. TEMPERATURE

MAX5074 toc15

TEMPERATURE (°C)

REGOUT

(mV)

1109565 80-10 5 20 35 50-25

151

152

153

154

155

156

157

158

159

160

150

-40 125

HVIN RISING

PPWM TO XFRMRL SKEW

vs. TEMPERATURE

MAX5074 toc16

TEMPERATURE (°C)

PPWM TO XFRML SKEW (ns)

1109565 80-10 5 20 35 50-25

106

107

108

109

110

111

112

113

114

115

105

-40 125

FLTINT CURRENT vs. TEMPERATURE

MAX5074 toc17

TEMPERATURE (°C)

FLTINT

(µA)

1109565 80-10 5 20 35 50-25

-40 125

FLTINT SHUTDOWN

VOLTAGE vs. TEMPERATURE

MAX5074 toc18

TEMPERATURE (°C)

FLTINT

(V)

1109565 80-10 5 20 35 50-25

1.9

2.0

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

1.8

-40 125

FALLING

RISING

POWER MOSFETS R

DS(ON)

vs. TEMPERATURE

MAX5074 toc19

TEMPERATURE (°C)

DS(ON)

(Ω)

1109565 80-10 5 20 35 50-25

0.25

0.30

0.35

0.40

0.45

0.50

0.55

0.60

0.65

0.70

0.20

-40 125

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