Typical operating characteristics – Rainbow Electronics MAX16820 User Manual
Page 4
MAX16819/MAX16820
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
IN
= V
DIM
= 12V, C
VCC
= 1µF, R
SENSE
= 0.5Ω connected between IN and CSN. Typical values at T
A
= +25°C, unless otherwise
noted.)
EFFICIENCY vs. V
IN
MAX16819 toc01
V
IN
(V)
EFFICIENCY (%)
25
20
10
15
65
70
75
80
90
85
95
100
60
5
30
LED 5
LED 4
L = 47
µH
DRV SWITCHING FREQUENCY
vs. V
IN
MAX16819 toc02
V
IN
(V)
DRV SWITCHING FREQUENCY (kHz)
24
20
16
12
8
100
200
300
400
600
500
700
800
900
1000
1100
1200
1300
1400
1500
0
4
28
L = 47
µH
LED 5
LED 4
LED 3
LED 1
LED 2
LED CURRENT VARIATION vs. V
IN
MAX16819 toc03
V
IN
(V)
LED CURRENT VARIATION FROM SET CURRENT (%)
25
20
10
15
-1.5
-1.0
-0.5
0
1.0
0.5
1.5
2.0
-2.0
5
30
LED 5
LED 4
LED 3
LED 2
LED 1
I
LED(NOMINAL)
= 400mA
L = 47
µH
V
CC
vs. V
IN
MAX16819 toc04
V
IN
(V)
V
CC
(V)
25.0
22.5
17.5 20.0
10.0 12.5 15.0
7.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
4.5
5.0
27.5
I
LED
= 0
V
CC
vs. TEMPERATURE
MAX16819 toc05
TEMPERATURE (
°C)
V
CC
(V)
110
95
65 80
-10 5
20 35 50
-25
5.31
5.32
5.33
5.34
5.35
5.36
5.37
5.38
5.39
5.40
5.30
-40
125
V
IN
= 24V
V
IN
= 12V
V
DIM
= 0V
SUPPLY CURRENT vs. V
IN
MAX16819 toc06
V
IN
(V)
SUPPLY CURRENT (
µ
A)
24.5
12.5
20.5
16.5
8.5
50
100
150
200
250
300
0
4.5
28.5
V
DIM
= 0V
PWM DIMMING AT 200Hz
(10% DUTY CYCLE)
MAX16819 toc07
1ms/div
V
DIM
2V/div
0V
0A
I
LED
200mA/div
V
IN
= 12V, L = 47
µH,
1 LED MAX16819
PWM DIMMING AT 200Hz
(90% DUTY CYCLE)
MAX16819 toc08
1ms/div
V
DIM
2V/div
0V
0A
I
LED
200mA/div
V
IN
= 12V, L = 47
µH,
1 LED MAX16819