LT3956 데이터 시트보기 (PDF) - Linear Technology
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LT3956 Datasheet PDF : 20 Pages
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LT3956
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Quiescent Current
vs Switching Frequency
12
10
8
6
4
2
0
0
200 400 600 800 1000
SWITCHING FREQUENCY (kHz)
3956 G13
SW Pin Current Limit
vs Duty Cycle
4.5
4.0
3.5
3.0
INTVCC Current Limit
vs Temperature
20
NOT SWITCHING
18
16
14
12
10
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3956 G14
LED Current Sense Threshold
vs FB Voltage
312.5
VCTRL = 2V
250.0
187.5
125.0
62.50
INTVCC Voltage vs Temperature
7.4
7.3
7.2
7.1
7.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3956 G15
INTVCC Dropout Voltage
vs INTVCC Current
0
–0.5
–40°C
25°C
–1.0
–1.5
125°C
–2.0
2.5
0
25
50
75
DUTY CYCLE (%)
100
3956 G16
ISP/ISN Input Bias Current
vs CTRL Voltage
80
ISP
60
40
ISN
20
0
0
0.5
1
1.5
2
CTRL (V)
3956 G19
0
–2.5
1.2
1.22
1.24
1.26
1.28
0
3
6
9
12
15
FB VOLTAGE (V)
3956 G17
LDO CURRENT (mA)
3956 G18
Switch On-Resistance
vs Temperature
180
160
140
120
100
80
60
40
20
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3956 G20
PWMOUT Waveform
CPWMOUT = 2.2nF
PWM
INPUT
PWMOUT
5V/DIV
200ns/DIV
3956 G21
3956f
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