Typical operating characteristics (continued) – Rainbow Electronics MAX5074 User Manual
Page 6
MAX5074
Power IC with Integrated MOSFETs for Isolated IEEE
802.3af PD and Telecom Power-Supply Applications
6
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
HVIN
= 48V, V
INBIAS
= 15V, C
INBIAS
= 1µF, C
REGOUT
= 2.2µF, R
RTCT
= 25k
Ω, C
RTCT
= 100pF, C
BST
= 0.22µF, V
CSS
= V
CS
= 0V,
V
RAMP
= V
UVLO
= 3V, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.)
OPERATING FREQUENCY
vs. TEMPERATURE
MAX5074 toc12
TEMPERATURE (
°C)
OPERATING FREQUENCY (kHz)
110
95
-25 -10 5
35 50 65
20
80
250
300
350
400
450
500
550
600
200
-40
125
R
RTCT
= 12k
Ω
C
RTCT
= 100pF
R
RTCT
= 25k
Ω
C
RTCT
= 100pF
SOFT-START CURRENT
vs. TEMPERATURE
MAX5074 toc13
TEMPERATURE (
°C)
SOFT-START CURRENT (
µ
A)
110
95
-25 -10 5
35 50 65
20
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)
V
RCFF
(V), V
OPTO
(V)
110
95
-25 -10 5
35 50 65
20
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)
V
REGOUT
(mV)
110
95
65 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)
110
95
65 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)
I
FLTINT
(µ
A)
110
95
65 80
-10 5
20 35 50
-25
76
77
78
79
80
81
82
83
84
85
75
-40
125
FLTINT SHUTDOWN
VOLTAGE vs. TEMPERATURE
MAX5074 toc18
TEMPERATURE (
°C)
V
FLTINT
(V)
110
95
65 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)
R
DS(ON)
(Ω
)
110
95
65 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