lt3804 Linear Technology Corporation, lt3804 Datasheet - Page 4

• Manufacturer Part Number: lt3804
• Description: Secondary Side Dual Output Controller With Opto Driver
• Manufacturer: Linear Technology Corporation

LT3804
TYPICAL PERFOR A CE CHARACTERISTICS
4
215
210
205
200
195
–1
8.1
8.0
7.9
7.8
7.7
3
2
1
0
–40
V
Temperature
0
Switching Frequency vs
Temperature
V
GBIAS
CSET = 500pF
CSET = 500pF
T
REF
A
–20
= 25 C
vs V
JUNCTION TEMPERATURE ( C)
vs I
10
0
CC
GBIAS
10
, FREQ vs V
I
GBIAS
V
25
CC
–40 C
25 C
125 C
Over Junction
V
FREQ
15
REF
(V)
(mA)
50
75
20
20
CC
W
100
3804 G04
3804 G01
3804 G07
U
25
125
26
1
0
–1
13
12
11
10
800
600
400
200
300
250
200
150
100
9
8
7
6
5
50
I
0
8
100 200 300
CC
T
CSET vs Switching Frequency
G
0
A
T
CSET
BIAS
vs V
= 25 C
A
10
C
T
GBIAS
A
= 25 C
= 25 C
CC
vs I
12
= 2.2 F
(Switching Off)
GBIAS
400 500 600 700 800 900 1000
14
V
CSET (pF)
CC
MAXIMUM DUTY CYCLE
16
(Charging 2.2 F)
500 s
TIME
(V)
18
V
I
GBIAS
GBIAS
20
22
3804 G02
3804 G05
3804 G08
24
1ms
1.00
0.95
0.90
0.85
0.80
0.75
0.70
12
10
8
6
4
2
0
120
–20
80
40
0
10
Voltage Amplifier V
and Phase
T
0.602
0.601
0.600
0.599
0.598
0.587
0.596
A
= 25 C
8
7
6
5
4
3
2
1
0
100
30
–40
Current Limit Amplifier CA1 Gain
at V
V
V
V
T
REF
GAIN
A
CC
CL2N
1k
CC
–20
= 25 C
= 11V
FREQUENCY (Hz)
vs Temperature
JUNCTION TEMPERATURE ( C)
= 11V, V
= 5V
40
10k 100k
V
0
CL2P
0dB, 10MHz
A1
25
– V
CL2N
PHASE
50
, V
(–111 )
CL2N
CSET PEAK
1M
50
A2
= 5V
(mV)
Gain
10M 100M
CSET VALLEY
75
3804 G03
60
100
–0
–50
–100
–150
–180
3804 G09
3804 G06
3804i
70
125