LTC3803 Datasheet, PDF (4/12 Pages) Linear Technology – Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

LTC3803
TYPICAL PERFOR A CE CHARACTERISTICS
V_CC Undervoltage Lockout
Thresholds vs Temperature
10.0
9.5
9.0
V_TURNON
8.5
8.0
7.5
7.0
6.5
6.0
V_TURNOFF
5.5
5.0
–50 –30 –10 10 30 50 80
TEMPERATURE (°C)
90 110
3803 G07
Start-Up I_CC Supply Current
vs Temperature
60 _{VCC = VTURNON – 0.1V}
50
40
30
20
10
V_CC Shunt Regulator Voltage
vs Temperature
10.0
9.9
9.8
9.7
9.6
I_CC = 25mA
9.5
9.4
I_CC = 1mA
9.3
9.2
9.1
9.0
–50 –30 –10 10 30 50 70 90 110
TEMPERATURE (°C)
3803 G08
I_TH/RUN Shutdown Threshold
vs Temperature
450
400
350
300
250
200
150
I_CC Supply Current
vs Temperature
265
V_CC = 8V
260 V_ITH/RUN = 1.3V
255
250
245
240
235
230
225
220
215
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
3803 G08
I_TH/RUN Start-Up Current Source
vs Temperature
600 _{VCC = VTURNON + 0.1V}
V_ITH/RUN = 0V
500
400
300
200
100
0
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
3803 G10
100
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
3803 G11
0
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
3803 G12
Peak Current Sense Voltage
vs Temperature
120 _{VCC = 8V}
115
110
105
100
95
90
85
80
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
3803 G13
Soft-Start Time vs Temperature
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
3803 G14
3803i
4