Typical operating characteristics (continued) – Rainbow Electronics MAX16820 User Manual
Page 5
MAX16819/MAX16820
PWM DIMMING AT 20kHz
(10% DUTY CYCLE)
MAX16819 toc12
10
µs/div
V
DIM
2V/div
0V
0A
I
LED
200mA/div
V
IN
= 24V, L = 47
µH,
4 LEDS MAX16820
PWM DIMMING AT 20kHz
(90% DUTY CYCLE)
MAX16819 toc13
10
µs/div
V
DIM
2V/div
0V
0A
I
LED
200mA/div
V
IN
= 24V, L = 33
µH,
4 LEDS MAX16820
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
_______________________________________________________________________________________
5
PWM DIMMING AT 200Hz
(1% DUTY CYCLE)
MAX16819 toc09
10
µs/div
V
DIM
2V/div
0V
0A
I
LED
200mA/div
V
IN
= 12V, L = 47
µH,
1 LED MAX16819
PWM DIMMING EXPANDED
(50% DUTY CYCLE)
MAX16819 toc10
1
µs/div
V
DIM
2V/div
0V
0A
I
LED
200mA/div
V
IN
= 24V, L = 33
µH,
4 LEDS MAX16820
PWM DIMMING EXPANDED
(50% DUTY CYCLE)
MAX16819 toc11
4
µs/div
V
DIM
2V/div
0V
0A
I
LED
200mA/div
V
IN
= 12V, L = 47
µH,
1 LED MAX16819
I
LED
VARIATION vs. TEMPERATURE
MAX16819 toc14
TEMPERATURE (
°C)
LED CURRENT VARIATION FROM SET CURRENT (%)
110
95
-25 -10 5
35 50 65
20
80
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
-40
125
V
IN
= 24V
V
IN
= 12V
V
DIM
= 0V
I
LED(NOMINAL)
= 400mA
L = 47
µH
Typical Operating Characteristics (continued)
(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.)