LTC3706_15 Datasheet, PDF (5/22 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller with PolyPhase Capability

LTC3706
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
V_CC Supply Current
vs Input Voltage
7 _{fOSC = 200kHz}
ALL GATES: C_LOAD = 0
6
5
4
3
5
6
7
8
9
10
INPUT VOLTAGE (V)
3706 G01
Maximum Current Sense
Threshold vs ITH Voltage
100
80
60
40
20
0
0 0.5 1.0 1.5 2.0 2.5 3.0
ITH VOLTAGE (V)
3706 G04
Maximum Current Sense
Threshold vs Temperature
101.5
V_CC Regulator Output Voltage
vs Temperature
7.06
7.04
7.02
7.00
6.98
6.96
6.94
6.92
6.90
6.88
6.86
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3706 G02
IS Pins Source Current
400
300
200
100
CT-MODE: I_IS+
0
–100
–200
–300
RS-MODE: (I_IS+ + I_IS–)
–400
–1
0123456
IS⁺, IS^– COMMON MODE VOLTAGE (V)
3706 G05
RUN/SS ON Threshold
vs Temperature
470
101.0
460
100.5
450
100.0
440
99.5
430
99.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3706 G07
420
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3706 G08
Maximum Current Sense
Threshold vs Duty Cycle
100
R_SLP = 0
80
100kΩ
60
R_SLP = 50k
40
20
0
0
20
40
60
80
DUTY CYCLE (%)
3706 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
3706 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
3706 G09
3706fd
5