LT1952-1 Linear Technology, LT1952-1 Datasheet - Page 7

• Manufacturer Part Number: LT1952-1
• Description: Single Switch Synchronous Forward Controller
• Manufacturer: Linear Technology

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TYPICAL PERFORMANCE CHARACTERISTICS
1000
100
125
800
600
400
200
75
50
25
90
80
70
60
50
40
30
20
0
0
1.60
0
0
BLANK Duration vs R
OUT Rise/Fall Time
vs OUT Load Capacitance
OUT: Max Duty Cycle CLAMP
vs SS_MAXDC
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
r
SS_MAXDC (V)
2000
60
1.84
R
BLANK
80
t
f
3000
(k)
100
SD_V
SD_V
SD_V
BLANK
120
SEC
SEC
SEC
4000
2.08
= 1.32V
= 1.98V
= 2.64V
140
1952 G20
1952 G23
1952 G26
5000
160
2.32
2.20
2.08
1.96
1.84
1.72
1.60
200
150
100
100
90
70
50
80
0
–50
100
100
t
vs Temperature
OUT: Max Duty Cycle vs f
SS_MAXDC Setting
vs f
DELAY
T
SS_MAXDC = 2.5V
SD_V
T
SD_V
R
A
A
DELAY
= 25°C
= 25°C
–25
OSC
SEC
SEC
: SOUT Rise to OUT Rise
= 10k
200
(for OUT DC = 72%)
200
= 1.4V
= 1.32V
0
TEMPERATURE (°C)
R
R
DELAY
DELAY
f
f
25
OSC
OSC
300
300
= 120k
= 40k
(kHz)
(kHz)
50
75
400
400
OSC
100
1952 G19
1952 G21
1952 G24
125
500
500
240
160
0.8
0.6
0.4
0.2
1.2
1.0
80
90
80
70
60
50
40
30
20
10
LT1952/LT1952-1
0
0
0
1.32
–50
0
t
vs 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
OSC
A
A
DELAY
= 25°C
= 25°C
–25
DELAY
= 200kHz
40
: SOUT Rise to OUT Rise
= 10k
1.65
SEC
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
1952 G22
1952 G25
19521fd
1952 G27
7
2.64
240
125