LT1248CN Ver la hoja de datos (PDF) - Linear Technology
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LT1248CN Datasheet PDF : 12 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
LT1248
GTDR Rise and Fall Time
400
300
200
100
0
0
FALL TIME
RISE TIME
NOTE: GTDR SLEWS
BETWEEN 1V AND 16V
10
20
30
40
50
LOAD CAPACITANCE (nF)
1248 G08
Start-Up Supply Current vs
Supply Voltage
550
500
450
400
350
300
–55°C
250
25°C
200
125°C
150
100
50
0
02
4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
1248 G09
Frequency vs RSET and CSET
500
450
RSET = 10k
RSET = 15k
400
RSET = 20k
350
RSET = 30k
300
250
200
150
100
50
0
200 600 1000 1400 1800 2200
CSET CAPACITANCE (pF)
1248 G10
GTDR Maximum Duty Cycle vs
RSET and CSET
1.00
0.99
0.98
0.97
0.96
0.95
0.94
0.93
0.92
0.91
0.90
200
RSET = 10k
RSET = 15k
RSET = 20k
RSET = 30k
600 1000 1400 1800 2200
CSET CAPACITANCE (pF)
1248 G11
Shutdown Mode Supply Current
and Reference Voltage
1.1
1.1
1.0 EN/SYNC ≤ 1.8V
1.0
0.9
0.9
0.8
0.8
0.7
0.7
0.6
0.6
0.5
SUPPLY CURRENT
0.5
–55°C ≤ TJ ≤ 25°C
0.4
TJ = 125°C
0.4
0.3
0.3
0.2
0.1
0
0
0.2
REFERENCE VOLTAGE
TJ ≤ 125°C
0.1
0
16
32
SUPPLY VOLTAGE (V)
1248 G12
Synchronization and Shutdown
Thresholds at EN/SYNC Pin
–44
–40
–36
SHUTDOWN
THRESHOLD
–32
–28
–24
–20
–16
–12
SYNCHRONIZATION
THRESHOLD
TJ = – 55°C
TJ = 25°C
TJ = 125°C
–8
–4
0
0 1 2 3 4 5 6 7 8 9 10
EN/SYNC VOLTAGE (V)
1248 G13
SS Pin Characteristics
–22
–20
–18
–16
–14
–12
–10
–8
–6
–4
–2
0
0
TJ = –55°C
TJ = 25°C
TJ = 125°C
4
SS VOLTAGE (V)
8
1248 G14
MOUT Pin Characteristics
1.5
1.0
TJ = 125°C
TJ = 25°C
0.5
TJ = –55°C
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–2.4
–1.2
0
1.2
MOUT VOLTAGE (V)
2.4
1248 G15
5
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