LT1950 Linear Technology, LT1950 Datasheet - Page 4

• Manufacturer Part Number: LT1950
• Description: Single Switch PWM Controller
• Manufacturer: Linear Technology

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LT1950
PARAMETER
Maximum Duty Cycle Clamp
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1950EGN is guaranteed to meet performance specifications
from 0 C to 125 C operating junction temperature. Specifications over the
–40 C to 125 C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LT1950IGN is guaranteed over the full –40 C to 125 C operating
junction temperature range.
Note 3: Rise and Fall times are between 10% and 90% levels.
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
= 0.1 F, SHDN = V
specified.
TYPICAL PERFOR A CE CHARACTERISTICS
4
SEC
1.45
1.40
1.35
1.30
1.25
1.20
1.26
1.25
1.24
1.23
1.22
1.21
1.20
Input Bias Current
–50
–50
FB Voltage vs Temperature
Shutdown Threshold vs
Temperature
–25
–25
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
IN
25
25
, BLANK = 0V, I
50
50
75
75
W
100
100
SENSE
1950 G01
1950 • G04
U
125
125
= 0V, V
CONDITIONS
V
0V < V
SEC
IN2
240
230
220
210
200
190
180
170
160
125
120
115
110
105
100
95
90
85
80
75
= 1.4V, FB = 1V, COMP = V
–50
–50
SEC
= 15V, GATE = 1nF, BOOST = open, V
A
Switching Frequency vs
Temperature
Maximum I
Temperature
= 25 C. COMP = open, FB = 1.4V, R
< 2.8V
–25
–25
The
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
SENSE
denotes the specifications which apply over the full operating
25
25
Note 4: Guaranteed by correlation to static test.
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125 C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 6: Guaranteed but not tested.
Note 7: Maximum recommended SYNC frequency = 500kHz.
Threshold vs
50
50
OH
75
75
100
100
1950 • G02
1950 G05
125
125
IN
OSC
= 15V, V
= 249k, SYNC = 0V, SLOPE = open, V
270
250
230
210
190
170
150
130
110
16
14
12
10
90
8
6
4
2
0
–50
–50
V
I
Temperature
SENSE
SHDN = 0V
SEC
IN
MIN
–25
63
Shutdown I
–25
= 0V, unless otherwise
Pin Current vs
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
–0.3
TYP
75
25
25
Q
vs Temperature
50
50
MAX
–1.0
87
75
75
sn1950 1950fs
100
100
1950 • G03
UNITS
1950 G06
REF
125
125
%
A