Datasheet

LT1952/LT1952-1
7
19521fe
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
–50
5.0
COMP SOURCE CURRENT (mA) • (–1)
12.5
0
50
75
1952 G10
10.0
7.5
–25
25
100
125
CURRENT OUT OF PIN
FB = 1V
COMP = 1.6V
TEMPERATURE (°C)
–50
5.0
COMP SINK CURRENT (mA)
12.5
0
50
75
1952 G11
10.0
7.5
–25
25
100
125
FB = 1.4V
COMP = 1.6V
TEMPERATURE (°C)
–50
0
COMP PIN CURRENT (µA)
50
40
30
0
50
75
1952 G12
10
20
–25
25
100
125
FB = V
REF
COMP = 1.6V
COMP (V)
0
0
I
SENSE
MAX THRESHOLD (mV)
240
160
200
120
1.0
2.0
2.5
1952 G13
40
80
0.5
1.5
3.0
T
A
= 25°C
R
ISENSE
= 0k
OC THRESHOLD
TEMPERATURE (°C)
–50
200
I
SENSE
MAX THRESHOLD (mV)
210
240
0
50
75
1952 G14
230
220
–25
25
100
125
COMP = 2.5V
R
ISENSE
= 0k
DUTY CYCLE (%)
0
0
I
SENSE
PIN CURRENT (µA)
10
40
20
50
60
1952 G15
30
20
10
30 40
80
70
90
100
T
A
= 25°C
DUTY CYCLE (%)
0
175
185
I
SENSE
MAX THRESHOLD (mV)
195
225
20
50
60
1952 G16
215
205
10
30 40
80
70
90
100
R
SLOPE
= 1k
R
SLOPE
= 470W
R
SLOPE
= 0W
T
A
= 25°C
COMP = 2.5V
TEMPERATURE (°C)
–50
80
OC THRESHOLD (mV)
90
120
0
50
75
1952 G17
110
100
–25
25
100
125
PRECISION OVERCURRENT THRESHOLD
INDEPENDENT OF DUTY CYCLE
TEMPERATURE (°C)
–50
0
BLANK DURATION (ns)
200
800
0
50
75
1952 G18
600
400
–25
25
100
125
R
BLANK
= 40k
R
BLANK
= 120k
I
SENSE
Maximum Threshold
vs COMP
I
SENSE
Maximum Threshold
vs Temperature
I
SENSE
Pin Current (Out of Pin)
vs Duty Cycle
I
SENSE
Maximum Threshold
vs Duty Cycle (Programming
Slope Compensation)
OC (Overcurrent) Threshold
vs Temperature Blank Duration vs Temperature
COMP Source Current
vs Temperature
COMP Sink Current
vs Temperature
(Disabled) COMP Pin Current
vs Temperature