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LT1946AEMS8E データシートの表示(PDF) - Linear Technology
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LT1946AEMS8E
2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
Linear Technology
LT1946AEMS8E Datasheet PDF : 12 Pages
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LT1946A
TYPICAL PERFOR A CE CHARACTERISTICS
Feedback Pin Voltage
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
–50 –25
0 25 50 75
TEMPERATURE (
°
C)
100 125
1946A G01
Switch Saturation Voltage
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
SWITCH CURRENT (A)
1946A G04
Transient Response for
Figure 1 Circuit
Oscillator Frequency
3000
2700
2400
2100
T
A
= –30
°
C
T
A
= 100
°
C
1800
1500
1200
T
A
= 25
°
C
900
600
300
0
0 0.2 0.4 0.6 0.8 1 1.2
FEEDBACK VOLTAGE (V)
1946A G02
Current Limit
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75
TEMPERATURE (
°
C)
100 125
1946A G03
Quiescent Current
Switching Waveforms for
Figure 1 Circuit
4.0
3.8
V
OUT
100mV/DIV
3.6
AC COUPLED
3.4
V
SW
10V/DIV
3.2
0V
3.0
2.8
I
LI
0.5A/DIV
2.6
100ns/DIV
2.4
2.2
–50 –25
0 25 50 75
TEMPERATURE (
°
C)
100 125
1946A G05
1946A G06
Start-Up Waveforms for
Figure 1 Circuit
V
OUT
100mV/DIV
AC COUPLED
V
OUT
2V/DIV
I
LI
0.5A/DIV
I
LOAD
250mA
150mA
50
µ
s/DIV
1946A G07
I
IN
200mA/DIV
0A
V
SHDN
5V
0V
R
LOAD
= 250
Ω
1ms/DIV
1946A G08
sn1946a 1946afs
3
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