LTC3873 Datasheet, PDF (4/16 Pages) Linear Technology – No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller

LTC3873
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Voltage vs Temperature
1.25
1.24
1.23
1.22
Feedback Voltage Line Regulation
1.2025
1.2020
1.2015
1.2010
I_TH Voltage vs RUN/SS Voltage
2.5
V_IN = 5V
2.0
1.5
1.21
1.2005
1.0
1.20
1.2000
0.5
1.19
1.1995
1.18
1.1990
–60 –40 –20 0 20 40 60 80 100 120
5
6
7
8
9
10
TEMPERATURE (°C)
V_IN (V)
3873 G01
3873 G02
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
RUN/SS VOLTAGE (V)
3873 G03
Shutdown Mode I_Q vs V_IN
70
65
60
55
50
45
40
35
30
25
20
34 5 67 8
V_IN (V)
9 10
3873 G04
Shutdown I_Q vs Temperature
80
70
60
50
40
30
20
10
0
–60 –40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
3873 G05
Gate Drive Rise and Fall Time
vs C_LOAD
100
90
80
70
RISE TIME
60
FALL TIME
50
40
30
20
10
0
0 2000 4000 6000 8000 10000
C_LOAD (pF)
3873 G06
RUN Threshold vs Temperature
1.0
0.9
0.8
RISING
FALLING
0.7
0.6
0.5
–60 –40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
3873 G07
Shunt Regulation Voltage
vs I_SHUNT
10.2
10.1
10.0
9.9
9.8
9.7
9.6
9.5
9.4
9.3
9.2
0 5 10 15 20 25 30 35 40 45
I_SHUNT (mA)
3873 G08
3873fa
4