LTC3726 Datasheet, PDF (4/16 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller

LTC3726
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
V_CC Supply Current vs
Input Voltage
7
f_OSC = 200kHz
ALL GATES: C_LOAD = 0
6
5
4
Maximum Current Sense
Threshold vs Duty Cycle
100
R_SLP = 0
80
100kΩ
60
R_SLP = 50k
40
20
Maximum Current Sense
Threshold vs ITH Voltage
100
80
60
40
20
3
5
6
7
8
9
10
INPUT VOLTAGE (V)
3726 G01
IS Pins Source Current
400
300
200
100
CT-MODE: I_IS+
0
–100
–200
–300
RS-MODE: (I_IS+ + I_IS–)
–400
–1 0 1 2 3 4 5 6
IS⁺, IS^– COMMON-MODE VOLTAGE (V)
3726 G05
RUN/SS ON Threshold
vs Temperature
470
460
450
440
430
420
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3726 G08
4
0
0
20
40
60
80
DUTY CYCLE (%)
3726 G03
IS Pins Source Current
vs Temperature
265
RS-MODE: (I_IS+ + I_IS–)
260
V_IS+ = V_IS– = 0V
255
250
245
240
235
230
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3726 G06
Oscillator Frequency
vs Temperature
5
4
3
2 ^{R = 175KΩ}
f_OSC = 500kHz
1
0
–1
–2
–50
R = 75KΩ
f_OSC = 100kHz
–25 0 25 50 75
TEMPERATURE (°C)
100 125
3726 G14
0
0 0.5 1.0 1.5 2.0 2.5 3.0
ITH VOLTAGE (V)
3726 G04
Maximum Current Sense
Threshold vs Temperature
101.5
101.0
100.5
100.0
99.5
99.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3726 G07
Oscillator Frequency vs R_FS
600
500
400
300
200
100
0
50 75 100 125 150 175 200
R_FS (kΩ)
3726 G09
3726fb