Linear Technology LT3480, Руководство пользователя

Страница: 6 / 24

LT3480
6
3480fb
FB PIN ERROR VOLTAGE (V)
–200
–50
V
C
PIN CURRENT (μA)
–20
0
20
0 200
50
3480 G19
–40
–100 100
40
10
–10
30
–30
LOAD CURRENT (A)
1
INPUT VOL
TAGE (V)
3.0
3.5
10000
3480 G20
2.5
2.0
10 100 1000
5.0
4.5
4.0
V
OUT
= 3.3V
T
A
= 25°C
L = 4.7μH
f = 800kHz
1 10000 10 100 1000
LOAD CURRENT (A)
INPUT VOL
TAGE (V)
5.0
5.5
3480 G21
4.5
4.0
6.5
6.0
V
OUT
= 5V
T
A
= 25 °C
L = 4.7μH
f = 800kHz
TEMPERATURE (°C)
V
C
VOL
TAGE (V)
1.50
2.00
2.50
3480 G22
1.00
0.50
0
CURRENT LIMIT CLAMP
SWITCHING THRESHOLD
–50 25 –25 0 50 75 100 150 125
TEMPERATURE (°C)
THRESHOLD VOL
TAGE (%)
85
90
95
3480 G23
80
75
–50 25 –25 0 50 75 100 150 125 3480 G24
I
L
0.2A/DIV
V
SW
5V/DIV
V
OUT
10mV/DIV
5μs/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 10mA
Error Amp Output Current Minimum Input Voltage Minimum Input Voltage
V
C
Voltages Power Good Threshold Switching Waveforms; Burst Mode
3480 G25
I
L
0.2A/DIV
V
SW
5V/DIV
V
OUT
10mV/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 110mA
1μs/DIV
3480 G26
I
L
0.5A/DIV
V
SW
5V/DIV
V
OUT
10mV/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 1A
1μs/DIV
Switching Waveforms; Transition
from Burst Mode to Full Frequency Switching Waveforms; Full
Frequency Continuous Operation
TYPICAL PERFORMANCE CHARACTERISTICS