LTC3706 Datasheet, PDF (6/20 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller with PolyPhase Capability

LTC3706
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Oscillator Frequency vs R_FS
600
500
400
300
200
100
0
50 75 100 125 150 175 200
R_FS (kΩ)
3706 G09
FB Voltage Line Regulation
601.0
600.5
600.0
599.5
599.0
0
5 10 15 20 25 30
V_IN SUPPLY VOLTAGE (V)
3706 G11
Gate Driver On-Resistance
vs Temperature
2.50
V_CC = 7V
2.25
2.00
1.75
1.50
1.25
1.00
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3706 G13
6
REGSD Shutdown Threshold
vs Temperature
4.010
FB Voltage vs Temperature
601.0
4.005
600.5
4.000
600.0
3.995
599.5
3.990
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3706 G10
Undervoltage Lockout
vs Temperature
4.65
4.60
4.55
V_CC RISING
4.50
4.45
4.40
4.35
V_IN RISING
4.30
4.25
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3706 G16
599.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3706 G15
Gate Driver On-Resistance vs V_CC
1.8
1.7
1.6
1.5
PULL-DOWN
1.4
PULL-UP
1.3
1.2
5
6
7
8
9
10
V_CC VOLTAGE (V)
3706 G12
Efficiency (Figure 5)
95
V_IN = 36V
90
Load Step (Figure 5)
V_OUT
100mV/DIV
V_IN = 72V
I_OUT
10A/DIV
85
80
0
5
10
15
20
25
LOAD CURRENT (A)
20μs/DIV
V_IN = 48V
V_OUT = 3.3V
LOAD STEP = 0A TO 20A
3706 G17
3706 G18
3706fb