AME5144 Datasheet, PDF (11/15 Pages) AMETHERM Circuit Protection Thermistors – High Efficiency, 37V Step-Up Converter for 2 to 10 White LEDs

AME
AME5144
Efficiency vs Input Voltage
100
3 LEDs
95
90 ^{4 LEDs}
85
80
75
6 LEDs
70
65
8 LEDs
60
10 LEDs
55
50
45
2
3
4
5
6
Input Voltage(V)
High Efficiency, 37V Step-Up
Converter for 2 to 10 White LEDs
Efficiency vs LED Current
95
90
3 LEDs
6 LEDs
85
80
75
10 LEDs
8 LEDs
70
65
60
55
50
0
5
10
15
20
25
LED Current(mA)
LED Current vs Direct-PWM Dimming
30
25
20
15
10
5
0
0
20
40
60
80
100
Duty Cycle(%)
Switching Waveforms
LED Current vs Ambient Temperature
26
24
22
20
18
ILED=15mA
16
14
12
C
10
8
-40
-20
0
20
40
60
80
100
Temperature(^oC)
ie
Soft-Start And Shutdown Response
VIN
VLX
VOUT
IL
400 ns/div
20mV/div
AC-coupled
10V/div
200 mV/ div
AC-coupled
100mA/div
VCTRL
IIN
ILED
VOUT
20 ms/div
2V/ div
100mA/div
50 mA/ div
10 V/div
Rev.D.01
11