LT1950EGN データシートの表示（PDF） - Linear Technology

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LT1950EGN

Single Switch PWM Controller with Auxiliary Boost Converter

Linear Technology 

LT1950

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. COMP = open, FB = 1.4V, ROSC = 249k, SYNC = 0V, SLOPE = open, VREF

= 0.1µF, SHDN = VIN, BLANK = 0V, ISENSE = 0V, VIN2 = 15V, GATE = 1nF, BOOST = open, VIN = 15V, VSEC = 0V, unless otherwise

specified.

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Maximum Duty Cycle Clamp

VSEC Input Bias Current

VSEC = 1.4V, FB = 1V, COMP = VOH

0V < VSEC < 2.8V

63

75

87

%

–0.3 –1.0

µA

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.

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.

TYPICAL PERFOR A CE CHARACTERISTICS

FB Voltage vs Temperature

1.26

1.25

1.24

1.23

1.22

1.21

1.20

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1950 G01

Shutdown Threshold vs

Temperature

1.45

1.40

1.35

1.30

1.25

1.20

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1950 • G04

Switching Frequency vs

Temperature

240

230

220

210

200

190

180

170

160

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1950 • G02

Maximum ISENSE Threshold vs

Temperature

125

120

115

110

105

100

95

90

85

80

75

–50 –25

0 25 50 75 100 125

TEMPERATURE (°C)

1950 G05

4

VIN Shutdown IQ vs Temperature

16

SHDN = 0V

14

12

10

8

6

4

2

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1950 • G03

ISENSE Pin Current vs

Temperature

270

250

230

210

190

170

150

130

110

90

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1950 G06

1950fa

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