MAX16831 Maxim Integrated Products, MAX16831 Datasheet - Page 7

• Manufacturer Part Number: MAX16831
• Description: High-Power LED Driver
• Manufacturer: Maxim Integrated Products

(V
550
500
450
400
350
300
250
200
150
100
CC
0.005
= V
PWM OSCILLATOR FREQUENCY
UVEN
vs. 1/RT CONDUCTANCE
0.015
= 14V, C
High-Voltage, High-Power LED Driver with
1/RT (kΩ
0.025
_______________________________________________________________________________________
REG1
-1
)
DRIVER (DRV) RISE TIME
0.035
= 1µF, C
DGT RISE TIME
1nF CAPACITOR CONNECTED
5nF CAPACITOR CONNECTED
40ns/div
40ns/div
0.045
REG2
Analog and PWM Dimming Control
FROM DGT TO AGND
FROM DRV TO AGND
V
HI
= 10µF, C
- V
MAX16831 toc18
LO
MAX16831 toc16
Typical Operating Characteristics (continued)
= 11V
200Hz DIMMING OPERATION
CLMP
2V/div
DGT OUTPUT
RISING
14V OFFSET
14V
2V/div
DRV OUTPUT
RISING
0V
2ms/div
= 0.1µF, R
T
MAX16831 toc14
= 25kΩ, R
DRIVER (DRV) FALL TIME
50% DIMMING
1A/div
10% DIMMING
1A/div
90% DIMMING
1A/div
0A
0A
0A
DGT FALL TIME
CS
1nF CAPACITOR CONNECTED
5nF CAPACITOR CONNECTED
40ns/div
= 0.1Ω, T
40ns/div
FROM DGT TO AGND
FROM DRV TO AGND
V
HI
A
100
- V
90
80
70
60
50
40
30
20
10
= +25°C, unless otherwise noted.)
0
MAX16831 toc19
MAX16831 toc17
LO
0
= 11V
LED CURRENT DUTY CYCLE
2V/div
DGT OUTPUT
FALLING
14V OFFSET
14V
2V/div
DRV OUTPUT
FALLING
0V
vs. DIM VOLTAGE
1
DIM VOLTAGE (V)
2
7
3