MAX16831_09 Datasheet, PDF (7/19 Pages) Maxim Integrated Products – High-Voltage, High-Power LED Driver with Analog and PWM Dimming Control

High-Voltage, High-Power LED Driver with
Analog and PWM Dimming Control
Typical Operating Characteristics (continued)
(V_CC = V_UVEN = 14V, C_REG1 = 1µF, C_REG2 = 10µF, C_CLMP = 0.1µF, R_T = 25kΩ, R_CS = 0.1Ω, T_A = +25°C, unless otherwise noted.)
PWM OSCILLATOR FREQUENCY
vs. 1/RT CONDUCTANCE
550
500
450
400
350
300
250
200
150
100
0.005
0.015 0.025 0.035
1/RT (kΩ^-1)
0.045
200Hz DIMMING OPERATION
MAX16831 toc14
10% DIMMING
1A/div
0A
50% DIMMING
1A/div
0A
90% DIMMING
1A/div
0A
2ms/div
LED CURRENT DUTY CYCLE
vs. DIM VOLTAGE
100
90
80
70
60
50
40
30
20
10
0
0
1
2
3
DIM VOLTAGE (V)
DRIVER (DRV) RISE TIME
MAX16831 toc16
DRIVER (DRV) FALL TIME
MAX16831 toc17
DRV OUTPUT
RISING
2V/div
0V
5nF CAPACITOR CONNECTED
FROM DRV TO AGND
40ns/div
DGT RISE TIME
MAX16831 toc18
DRV OUTPUT
FALLING
2V/div
0V
5nF CAPACITOR CONNECTED
FROM DRV TO AGND
40ns/div
DGT FALL TIME
MAX16831 toc19
DGT OUTPUT
RISING
14V OFFSET
2V/div
14V
V_HI - V_LO = 11V
1nF CAPACITOR CONNECTED
FROM DGT TO AGND
40ns/div
DGT OUTPUT
FALLING
14V OFFSET
2V/div
14V
V_HI - V_LO = 11V
1nF CAPACITOR CONNECTED
FROM DGT TO AGND
40ns/div
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