LT1248IS Linear Technology, LT1248IS Datasheet - Page 5

• Manufacturer Part Number: LT1248IS
• Description: IC PFC CTRLR AVERAGE CURR 16SOIC
• Manufacturer: Linear Technology

Specifications of LT1248IS

• Mode: Average Current
• Frequency - Switching: 300kHz
• Current - Startup: 250µA
• Voltage - Supply: 15.5 V ~ 27 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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