LTC3900_1 Datasheet, PDF (5/20 Pages) Linear Technology – Synchronous Rectifier Driver for Forward Converters

Typical Performance Characteristics
LTC3900
Propagation Delay vs C_LOAD
120
T_A = 25°C
110 ^VCC ^{= 5V}
100
90
80
70
60 ^{SYNC TO FG}
50
SYNC TO CG
40
1 2 3 4 5 6 7 8 9 10
C_LOAD (nF)
3900 G10
Rise/Fall Time vs V_CC
50
45
T_A = 25°C
C_LOAD = 4.7nF
40
35
30
25
20
15
10
FALL TIME
5
RISE TIME
0
45
6 7 8 9 10 11
V_CC (V)
3900 G11
Rise/Fall Time vs Temperature
50
45
V_CC = 5V
C_LOAD = 4.7nF
40
35
30
25
20
RISE TIME
15
10
FALL TIME
5
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3900 G12
Rise/Fall Time vs Load
Capacitance
50
45
T_A = 25°C
V_CC = 5V
40
35
30
25
20
RISE TIME
15
FALL TIME
10
5
0
0 1 2 3 4 5 6 7 8 9 10
C_LOAD (nF)
3900 G13
Undervoltage Lockout Threshold
Voltage vs Temperature
4.4
4.2
RISING EDGE
4.0
3.8
3.6
FALLING EDGE
3.4
3.2
3.0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3900 G14
V_CC Supply Current vs
Temperature
20
C_LOAD = 4.7nF
18
16
V_CC = 11V
14
12
10
8
V_CC = 5V
6
4
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3900 G15
V_CC Supply Current vs Load
Capacitance
30
T_A = 25°C
f_SYNC = 100kHz
25
V_CC = 11V
20
15
10
V_CC = 5V
5
0
0 1 2 3 4 5 6 7 8 9 10
C_LOAD (nF)
3900 G16
3900fb
5