LT1952-1 Linear Technology, LT1952-1 Datasheet - Page 6

• Manufacturer Part Number: LT1952-1
• Description: Single Switch Synchronous Forward Controller
• Manufacturer: Linear Technology

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LT1952/LT1952-1
TYPICAL PERFORMANCE CHARACTERISTICS
6
12.5
10.0
205
185
175
225
215
195
240
200
160
120
7.5
5.0
80
40
0
–50
0
0
COMP Source Current
vs Temperature
I
vs COMP
I
vs Duty Cycle (Programming
Slope Compensation)
T
COMP = 2.5V
FB = 1V
COMP = 1.6V
SENSE
T
R
SENSE
A
A
ISENSE
= 25°C
10
= 25°C
–25
0.5
20
Maximum Threshold
Maximum Threshold
= 0k
0
30 40
TEMPERATURE (°C)
1.0
DUTY CYCLE (%)
CURRENT OUT OF PIN
COMP (V)
25
50 60
1.5
50
R
R
R
OC THRESHOLD
2.0
SLOPE
SLOPE
SLOPE
70
75
80
= 0W
= 470W
= 1k
2.5
100
90 100
1952 G16
1952 G10
1952 G13
125
3.0
12.5
10.0
240
230
220
210
200
120
110
100
7.5
5.0
80
90
–50
–50
–50
COMP Sink Current
vs Temperature
I
vs Temperature
OC (Overcurrent) Threshold
vs Temperature
FB = 1.4V
COMP = 1.6V
SENSE
COMP = 2.5V
R
PRECISION OVERCURRENT THRESHOLD
INDEPENDENT OF DUTY CYCLE
ISENSE
–25
–25
–25
Maximum Threshold
= 0k
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
25
50
50
50
75
75
75
100
100
100
1952 G11
1952 G14
1952 G17
125
125
125
800
600
400
200
50
40
30
20
10
40
30
20
10
0
0
0
–50
–50
0
(Disabled) COMP Pin Current
vs Temperature
I
vs Duty Cycle
Blank Duration vs Temperature
FB = V
COMP = 1.6V
SENSE
T
A
10
= 25°C
–25
–25
REF
20
Pin Current (Out of Pin)
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
90 100
1952 G18
1952 G12
1952 G15
19521fd
125
125