LTC3772 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LTC3772 Datasheet PDF : 20 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
LTC3772
Maximum Current Sense
Threshold vs Temperature
300
IPRG = VIN
250
200
IPRG = FLOAT
150
IPRG = GND
100
50
0
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3772 G13
Soft-Start Time vs Temperature
1000
900
800
700
600
500
400
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3772 G14
Foldback Frequency
vs Temperature
230 VFB = 0V
220
210
200
190
180
170
160
150
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3772 G15
Efficiency vs Load Current
95
VIN = 3.3V
90
VIN = 4.2V
85
VIN = 5V
80
VIN = 7V
75
70
65
VOUT = 2.5V
60
FIGURE 5 CIRCUIT
1
10
100
1000 10000
LOAD CURRENT (mA)
3772 G16
Efficiency vs Load Current
100
FIGURE 5 CIRCUIT
VOUT = 3.3V
90
VOUT = 2.5V
80
VOUT = 1.8V
70
60
50
1
10
100
1000
LOAD CURRENT (mA)
10000
3772 G17
Start-Up
Load Step
VOUT
1V/DIV
ITH/RUN
1V/DIV
IL
2A/DIV
VIN = 5V
500µs/DIV
VOUT = 2.5V
FIGURE 5 CIRCUIT
3772 G18
VOUT
100mV/DIV
AC COUPLED
IL
2A/DIV
ILOAD
2A/DIV
VIN = 5V
20µs/DIV
VOUT = 2.5V
ILOAD = 100mA TO 1.5A
FIGURE 5 CIRCUIT
3772 G19
3772f
5
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