MAX16819 Maxim Integrated Products, MAX16819 Datasheet - Page 5

• Manufacturer Part Number: MAX16819
• Description: (MAX16819 / MAX16820) step-down constant-current high-brightness LED drivers
• Manufacturer: Maxim Integrated Products

(V
noted.)
IN
= V
High-Side Current Sense and 5000:1 Dimming
PWM DIMMING AT 200Hz
PWM DIMMING AT 20kHz
DIM
(10% DUTY CYCLE)
(1% DUTY CYCLE)
= 12V, C
10µs/div
10µs/div
V
1 LED MAX16819
V
4 LEDS MAX16820
IN
IN
_______________________________________________________________________________________
VCC
= 12V, L = 47µH,
= 24V, L = 47µH,
2MHz High-Brightness LED Drivers with
= 1µF, R
MAX16819 toc09
MAX16819 toc12
SENSE
V
2V/div
0V
I
200mA/div
0A
V
2V/div
0V
I
200mA/div
0A
LED
LED
DIM
DIM
= 0.5Ω connected between IN and CSN. Typical values at T
Typical Operating Characteristics (continued)
PWM DIMMING EXPANDED
PWM DIMMING AT 20kHz
(50% DUTY CYCLE)
(90% DUTY CYCLE)
10µs/div
1µs/div
V
4 LEDS MAX16820
V
4 LEDS MAX16820
IN
IN
= 24V, L = 33µH,
= 24V, L = 33µH,
MAX16819 toc10
MAX16819 toc13
V
2V/div
0V
I
200mA/div
0A
V
2V/div
0V
I
200mA/div
0A
LED
LED
DIM
DIM
-0.5
-1.0
-1.5
-2.0
2.0
1.5
1.0
0.5
0
-40
I
-25 -10 5
LED
PWM DIMMING EXPANDED
VARIATION vs. TEMPERATURE
A
= +25°C, unless otherwise
(50% DUTY CYCLE)
TEMPERATURE (°C)
20
4µs/div
35 50 65
I
L = 47µH
LED(NOMINAL)
V
1 LED MAX16819
IN
= 12V, L = 47µH,
80
= 400mA
MAX16819 toc11
95
110
125
V
2V/div
0V
I
200mA/div
0A
LED
DIM
5