Datasheet

LTC3823
6
3823fd
TYPICAL PERFORMANCE CHARACTERISTICS
V
OUT
2V/DIV
TRACK/SS
AND V
FB
500mV/DIV
250ms/DIV
3823 G13
TRACK/SS
V
FB
V
OUT
FIGURE 12 CIRCUIT
V
OUT
100mV/DIV
I
L
5A/DIV
STEP
0A TO 10A
20μs/DIV
3823 G14
FIGURE 12 CIRCUIT
Track Down Transient Response
Effi ciency vs Load Current
LOAD CURRENT (A)
0.1
50
EFFICIENCY (%)
55
65
70
75
100
85
1
3823 G15
60
90
95
80
10
DISCONTINUOUS MODE
CONTINUOUS MODE
FIGURE 12 CIRCUIT
LOAD CURRENT (A)
0
0
I
TH
VOLTAGE (mV)
200
600
800
1000
1400
1
5
7
38
2
3
G
1
6
400
1200
4
9
10
2
3
68
FIGURE 12 CIRCUIT
DISCONTINUOUS MODE
CONTINUOUS MODE
INPUT VOLTAGE (V)
0
240
FREQUENCY (kHz)
260
280
300
320
340
360
5101520
3823 G17
25
I
LOAD
= 10A
I
LOAD
= 1A
FCB = 0V
FIGURE 12 CIRCUIT
I
TH
Voltage vs Load Current Frequency vs Input Voltage
Effi ciency vs Input Voltage
Frequency vs Load Current
INPUT VOLTAGE (V)
0
EFFICIENCY (%)
92
96
100
20
3823 G18
88
84
90
94
98
86
82
80
5
10
15
25
I
LOAD
= 10A
I
LOAD
= 1A
FCB = 5V
FIGURE 12 CIRCUIT
LOAD CURRENT (A)
0
FREQUENCY (kHz)
400
350
300
250
200
150
100
50
0
8
3823 G19
246 107135 9
FIGURE 12 CIRCUIT
DISCONTINUOUS MODE
CONTINUOUS
MODE
Current Limit Foldback I
ON
Current vs V
IN
V
FB
(V)
0
MAXIMUM CURRENT SENSE THRESHOLD (mV)
60
80
100
0.3
0.5
3823 G20
40
20
0
0.1 0.2 0.4
120
140
160
0.6
V
RNG
= 1V
INPUT VOLTAGE, V
IN
(V)
0
80
100
140
15 25
3823 G21
60
40
510
20 30 35
20
0
120
I
ON
CURRENT (μA)
R
ON
= 82k