LT1952IGN Linear Technology, LT1952IGN Datasheet - Page 6

• Manufacturer Part Number: LT1952IGN
• Description: IC,SMPS CONTROLLER,CURRENT-MODE,SOP,16PIN,PLASTIC
• Manufacturer: Linear Technology

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