Rainbow-electronics MAX16831 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX16831

High-Voltage, High-Power LED Driver with

Analog and PWM Dimming Control

_______________________________________________________________________________________ 5

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

THERMAL SHUTDOWN

Thermal Shutdown Temperature T

SHDN

Temperature rising +165 °C

Hysteresis ∆T

SHDN

20 °C

ELECTRICAL CHARACTERISTICS (continued)

= V

UVEN

= 14V, C

REG1

= 1µF, C

REG2

= 1µF, C

CLMP

= 0.1µF, R

= 25kΩ, T

= T

= -40°C to +125°C, unless otherwise noted.

Typical specifications are at T

= +25°C.)

Note 1: Dropout voltage is defined as the input to output differential voltage at which the regulator output voltage drops 100mV below

the nominal output voltage.

Note 2: V

CLMPTH

determines the voltage required to operate the current-sense amplifier. The DIM driver requires 2.5V for (V

CLMP

- V

)

to drive the external MOSFET. V

is typically one diode drop above V

CLMP

. A large capacitor connected to V

CLMP

slows the

response of the LED current-sense circuitry, resulting in current overshoot. To ensure proper operation, connect a 0.1µF

capacitor from CLMP to LO.

Typical Operating Characteristics

= V

UVEN

= 14V, C

REG1

= 1µF, C

REG2

= 10µF, C

CLMP

= 0.1µF, R

= 25kΩ, R

= 0.1Ω, T

= +25°C, unless otherwise noted.)

-60 -20 0 20-40 40 60 80 120100 140

SHUTDOWN CURRENT

vs. TEMPERATURE

MAX16831 toc01

TEMPERATURE (

SHUTDOWN CURRENT (µA)

2.0

2.2

2.1

2.4

2.3

2.6

2.5

2.7

2.9

2.8

3.0

-60 -20 0 20-40 40 60 80 120100 140

OPERATING CURRENT

vs. TEMPERATURE

MAX16831 toc02

TEMPERATURE (

OPERATING CURRENT (mA)

DGT AND DRV NOT

SWITCHING

110

100

120

0 10203040

VOLTAGE ACROSS LED CURRENT-SENSE

RESISTOR vs. SUPPLY VOLTAGE

MAX16831 toc03

SUPPLY VOLTAGE (V)

VOLTAGE ACROSS R

(mV)

1 2 3 4 5 6 7 8 9 10 ... 19 20

MAX16831 1

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