Linear Technology LT3480 Manual page 6

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