LTC3900_1 Datasheet, PDF (4/20 Pages) Linear Technology – Synchronous Rectifier Driver for Forward Converters

LTC3900
Typical Performance Characteristics
Timeout vs V­_CC
5.25
5.20
T_A = 25°C
R_TMR = 51k
5.15 ^{CTMR = 470pF}
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
45 6 78
V_CC (V)
9 10 11
3900 G01
Current Sense Threshold vs
Temperature
17 V_CC = 5V, 11V
15
13
11
9
7
5
3
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3900 G04
SYNC Negative Threshold vs
Temperature
–1.0
V_CC = 5V, 11V
–1.1
–1.2
–1.3
–1.4
–1.5
–1.6
–1.7
–1.8
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3900 G07
4
Timeout vs Temperature
5.25
5.20
V_CC = 5V
R_TMR = 51k
5.15 ^{CTMR = 470pF}
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3900 G02
V_CS(MAX) Clamp Voltage vs CS⁺
Input Current
18
T_A = 25°C
17
16
15
14
13
12
11
10
0
5 10 15 20 25 30
CS⁺ INPUT CURRENT (mA)
3900 G05
Propagation Delay vs V_CC
120
T_A = 25°C
110 ^CLOAD ^{= 4.7nF}
100
90
80
70
60
SYNC TO FG
50
SYNC TO CG
40
45
6 7 8 9 10 11
V_CC (V)
3900 G08
Timeout vs R_TMR
10
T_A = 25°C
9 V_CC = 5V
8 ^{CTMR = 470pF}
7
6
5
4
3
2
1
0
0 10 20 30 40 50 60 70 80 90 100
R_TMR (kΩ)
3900 G03
SYNC Positive Threshold vs
Temperature
1.8
1.7
1.6
1.5
V_CC = 11V
1.4
V_CC = 5V
1.3
1.2
1.1
1.0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3900 G06
Propagation Delay vs
Temperature
120
V_CC = 5V
110 ^CLOAD ^{= 4.7nF}
100
90
80
70
SYNC TO FG
60
SYNC TO CG
50
40
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3900 G09
3900fb