LTC3705_15 Datasheet, PDF (4/20 Pages) Linear Technology – 2-Switch Forward Controller and Gate Driver

LTC3705
TYPICAL PERFOR A CE CHARACTERISTICS (T_A = 25°C unless otherwise specified)
Supply Current vs V_CC
2.0
TRICKLE CHARGER
1.5
LINEAR REGULATOR
1.0
0.5
0
0
5
10
15
V_CC (V)
3705 G01
UVLO Hysteresis Current vs
Temperature
5.05
5.00
4.95
4.90
4.85
4.80
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3705 G10
Shunt Regulator Current I_CC
vs V_CC
18
15
12
9
6
3
0
14.00
14.25
14.50
V_CC (V)
14.75 15.00
3705 G04
4
Boost Current vs Boost – TS
Voltage
400
350
V_TS = 80V
300
250
V_TS = 0V
200
150
100
50
0
0
5
10
15
V_BOOST – V_TS (V)
3705 G02
Oscillator Frequency
f_OSC vs R_FSET
800
700
600
500
400
300
SECONDARY-SIDE CONTROL
200
100
PRIMARY-SIDE CONTROL
0
0
100
200
300
400
R_FSET (kΩ)
3705 G03
Shunt Regulator Current vs
Temperature
25
24
23
22
21
20
19
18
17
16
15
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3705 G12
UVLO Voltage Threshold vs
Temperature
1.245
1.240
V_UVLOR
1.235
1.230
1.225
V_UVLOF
1.220
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3705 G09
Oscillator Frequency vs
Temperature
203
202
201
PRIMARY-SIDE CONTROL
200
R_FS(P) = 100kΩ
199
198
197
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3705 G11
V_GDUV vs Temperature
14
13
V_CC RISING (TRICKLE CHARGER)
12
11
10
9
8
V_CC RISING (LINEAR REGULATOR)
7
V_CC FALLING (BOTH)
6
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3705 G13
3705fb