ltc4269cdkd-2 Linear Technology Corporation, ltc4269cdkd-2 Datasheet - Page 8

• Manufacturer Part Number: ltc4269cdkd-2
• Description: Ieee 802.3at High Power Pd And Synchronous Forward Controller With Aux Support
• Manufacturer: Linear Technology Corporation

LTC4269-2
TYPICAL PERFORMANCE CHARACTERISTICS
8
12.5
10.0
220
200
120
110
100
240
230
210
7.5
5.0
90
80
–50
–50
–50
COMP Sink Current vs
Temperature
I
Temperature
OC (Overcurrent) Threshold vs
Temperature
FB = 1.4V
COMP = 1.6V
SENSE
PRECISION OVERCURRENT THRESHOLD
INDEPENDENT OF DUTY CYCLE
COMP = 2.5V
R
ISENSE
–25
–25
–25
Maximum Threshold vs
= 0k
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
25
50
50
50
75
75
75
100
100
100
42692 G19
42692 G22
42692 G25
125
125
125
400
800
600
200
20
50
40
30
20
10
40
30
10
0
0
0
–50
–50
0
(Disabled) COMP Pin Current vs
Temperature
I
Duty Cycle
Blank Duration vs Temperature
T
FB = V
COMP = 1.6V
SENSE
A
10
= 25°C
–25
–25
REF
20
Pin Current (Out of Pin) vs
0
0
30 40
TEMPERATURE (°C)
TEMPERATURE (°C)
DUTY CYCLE (%)
R
R
BLANK
BLANK
25
25
50 60
= 120k
= 40k
50
50
70
75
75
80
100
100
42692 G20
42692 G23
42692 G26
90 100
125
125
1000
205
185
175
600
240
200
160
120
225
215
195
800
400
200
80
40
0
0
0
0
0
I
COMP
I
Duty Cycle (Programming Slope
Compenstion)
BLANK Duration vs R
T
COMP = 2.5V
SENSE
T
R
SENSE
T
A
A
A
ISENSE
= 25°C
10
= 25°C
= 25°C
20
0.5
20
Maximum Threshold vs
Maximum Threshold vs
= 0k
40
30 40
1.0
DUTY CYCLE (%)
60
R
COMP (V)
BLANK
1.5
50 60
80
(k)
100
R
R
R
BLANK
OC THRESHOLD
2.0
SLOPE
SLOPE
SLOPE
70
120
80
= 0Ω
= 470Ω
= 1k
2.5
140
42692 G21
42692 G24
42692 G27
90 100
42692f
160
3.0