MAX16831 datasheet(7/20 Pages) MAXIM

Part #	MAX16831

Description	High-Voltage, High-Power LED Driver with Analog and PWM Dimming Control

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Manufacturer	MAXIM [Maxim Integrated Products]

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High-Voltage, High-Power LED Driver with

Analog and PWM Dimming Control

_______________________________________________________________________________________

7

Typical Operating Characteristics (continued)

(VCC = VUVEN = 14V, CREG1 = 1µF, CREG2 = 10µF, CCLMP = 0.1µF, RT = 25kΩ, RCS = 0.1Ω, TA = +25°C, unless otherwise noted.)

100

200

250

300

350

400

450

500

550

0.005

0.015

0.025

0.035

0.045

PWM OSCILLATOR FREQUENCY

vs. 1/RT CONDUCTANCE

1/RT (k

Ω-1)

150

2ms/div

200Hz DIMMING OPERATION

10% DIMMING

1A/div

MAX16831 toc14

0A

50% DIMMING

1A/div

0A

90% DIMMING

1A/div

0A

0

30

40

50

60

70

80

90

100

01

2

3

LED CURRENT DUTY CYCLE

vs. DIM VOLTAGE

DIM VOLTAGE (V)

20

10

40ns/div

DRIVER (DRV) RISE TIME

DRV OUTPUT

RISING

MAX16831 toc16

2V/div

0V

5nF CAPACITOR CONNECTED

FROM DRV TO AGND

40ns/div

DRIVER (DRV) FALL TIME

DRV OUTPUT

FALLING

MAX16831 toc17

2V/div

0V

5nF CAPACITOR CONNECTED

FROM DRV TO AGND

40ns/div

DGT RISE TIME

DGT OUTPUT

RISING

14V OFFSET

MAX16831 toc18

2V/div

14V

VHI - VLO = 11V

1nF CAPACITOR CONNECTED

FROM DGT TO AGND

40ns/div

DGT FALL TIME

DGT OUTPUT

FALLING

14V OFFSET

MAX16831 toc19

2V/div

14V

VHI - VLO = 11V

1nF CAPACITOR CONNECTED

FROM DGT TO AGND

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