LT1952
6
1952f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
COMP Source Current vs
Temperature
COMP Sink Current vs
Temperature
(Disabled) COMP Pin Current vs
Temperature
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 (Over-Current) Threshold vs
Temperature
Blank Duration vs Temperature
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
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
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
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
= 470Ω
R
SLOPE
= 0Ω
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 OVER-CURRENT 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
