LT1952IGN Linear Technology, LT1952IGN Datasheet - Page 7

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

TYPICAL PERFOR A CE CHARACTERISTICS
1000
600
100
800
400
200
125
75
50
25
90
80
70
60
50
40
30
20
0
0
1.60
OUT Rise/Fall Time vs OUT Load
Capacitance
OUT: Max Duty Cycle CLAMP vs
SS_MAXDC
BLANK Duration vs R
0
0
T
T
T
f
R
OSC
A
A
A
DELAY
= 25°C
= 25°C
= 25°C
20
= 200kHz
1000
OUT LOAD CAPACITANCE (pF)
= 10k
40
t
SS_MAXDC (V)
r
60
2000
1.84
R
BLANK
80
t
f
3000
(k)
100
SD_V
SD_V
SD_V
BLANK
120
SEC
SEC
SEC
W
4000
2.08
= 1.32V
= 1.98V
= 2.64V
140
1952 G26
1952 G20
1952 G23
U
5000
160
1.96
1.84
1.72
2.32
2.20
2.08
1.60
100
200
150
100
90
70
50
80
0
–50
100
100
OUT: Max Duty Cycle vs f
SS_MAXDC Setting vs f
(for OUT DC = 72%)
t
Temperature
DELAY
T
SS_MAXDC = 2.5V
SD_V
T
SD_V
R
A
A
DELAY
= 25°C
= 25°C
–25
SEC
SEC
: SOUT Rise to OUT Rise vs
= 10k
200
200
= 1.4V
= 1.32V
0
TEMPERATURE (°C)
R
R
DELAY
DELAY
f
f
25
OSC
OSC
300
300
= 120k
= 40k
(kHz)
(kHz)
50
OSC
75
400
400
OSC
100
1952 G19
1952 G21
1952 G24
125
500
500
120
200
160
1.2
1.0
0.8
0.6
0.4
0.2
80
40
60
50
40
30
20
10
90
80
70
0
0
0
1.32
–50
0
t
R
OUT: Max Duty Cycle CLAMP vs
SD_V
SS_MAXDC Reset and Active
Thresholds vs Temperature
DELAY
T
T
SS_MAXDC = 1.84V
f
R
DELAY
OSC
A
A
DELAY
= 25°C
= 25°C
–25
20
= 200kHz
SEC
: SOUT Rise to OUT Rise vs
= 10k
1.65
40
0
TEMPERATURE (°C)
ACTIVE THRESHOLD
RESET THRESHOLD
60
SD_V
R
25
DELAY
1.98
80
SEC
50
(k)
LT1952
(V)
100
75
120
2.31
100
140
1952 G27
1952 G25
1952 G22
7
1952f
2.64
160
125