LT3505IMS8E-TRPBF データシートの表示（PDF） - Linear Technology
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LT3505IMS8E-TRPBF Datasheet PDF : 24 Pages
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LT3505
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Current Limit
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
RT Pin Bias Voltage
505
VFB = 0.78V
500
495
490
485
480
–50 –25
0 25 50 75 100 125
TEMPERATURE(°C)
Switch Current Limit, RT = 75.0k
1.8
TA = 25°C
1.7
1.6
1.5
1.4
1.3
1.2
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
3505 G20
Switching Frequency
3.0
TA = 25°C
2.5
2.0
1.5
1.0
0.5
0
0 5 10 15 20 25 30 35
RT PIN BIAS CURRENT (µA)
Typical Minimum On Time
160
140
120
100
80
60
40
20
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
Switching Frequency
TA = 25°C
1
0.1
10
100
RT PIN RESISTANCE (kΩ)
3505 G24
Operating Waveforms
Operating Waveforms,
Discontinuous Mode
VSW
5V/DIV
IL
0.5A/DIV
0
VOUT
20mV/DIV
VIN = 12V
VOUT = 3.3V
IOUT = 0.5A
L = 10µH
COUT = 10µF
RT = 75.0k
1µs/DIV
3505 G18
VSW
5V/DIV
IL
0.5A/DIV
0
VOUT
20mV/DIV
VIN = 12V
VOUT = 3.3V
IOUT = 50mA
L = 10µH
COUT = 10µF
RT = 75.0k
1µs/DIV
3505 F26
3505fc
6
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