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
2000
60
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
240
160
1.2
1.0
0.8
0.6
0.4
0.2
LT1952/LT1952-1
80
60
50
40
30
20
10
90
80
70
0
0
0
1.32
–50
t
R
0
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
40
= 200kHz
SEC
: SOUT Rise to OUT Rise vs
= 10k
1.65
0
TEMPERATURE (°C)
80
ACTIVE THRESHOLD
RESET THRESHOLD
SD_V
R
25
DELAY
120
1.98
SEC
50
(k)
(V)
160
75
2.31
200
100
19521fb
1952 G25
1952 G22
7
1952 G27
2.64
125
240