Rainbow-electronics MAX16822B Instrukcja Użytkownika Pobierz pdf (Strona 3)

MAX16822A/MAX16822B

2MHz, High-Brightness LED Drivers with

Integrated MOSFET and High-Side Current Sense

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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

INTERNAL MOSFET

= V

DIM

= 24V, V

= 23.9V,

= 350mA

0.85 1.7

Drain-to-Source Resistance R

DSON

= V

DIM

= 6.0V, V

= 5.9V,

= 350mA

LX Leakage Current I

LX_LEAK

DIM

= 0V, V

= 65V 10 µA

DIM INPUT

DIM Input-Voltage High V

- V

= 100mV 2.8 V

DIM Input-Voltage Low V

- V

= 100mV 0.6 V

DIM Turn-On Time t

DIM_ON

DIM

rising edge to V

< 0.5V

200 ns

DIM Input Leakage High V

DIM

= V

15 µA

DIM Input Leakage Low V

DIM

= 0V -3 0 µA

THERMAL SHUTDOWN

Thermal-Shutdown Threshold Temperature rising 165

Thermal-Shutdown Threshold

Hsysteresis

THERMAL FOLDBACK

Thermal-Foldback Enable

Threshold Voltage

TFBON_THR

DIM

= 5V 1.9 2.0 2.12 V

Thermal-Foldback Slope FB

SLOPE

DIM

= 5V 0.75 1/V

TEMP_I Output Bias Current I

TEMP_I

25 26.5 28 µA

ELECTRICAL CHARACTERISTICS (continued)

= +24V, V

DIM

= V

, T

= T

= -40°C to +125°C, unless otherwise noted. Typical values are at T

= +25°C.)

EFFICIENCY

vs. V

MAX16822A toc01

(V)

EFFICIENCY (%)

5545352515

100

565

1 LED

3 LEDs

5 LEDs

7 LEDs

9 LEDs

11 LEDs

13 LEDs

15 LEDs

9 LEDs

DUTY CYCLE

vs. V

MAX16822A toc02

(V)

DUTY CYCLE (%)

5545352515

100

565

1 LED

3 LEDs

5 LEDs

7 LEDs

15 LEDs

11 LEDs

13 LEDs

FREQUENCY

vs. V

MAX16822A toc03

(V)

FREQUENCY (kHz)

5545352515

100

565

1 LED

3 LEDs

5 LEDs

7 LEDs

9 LEDs

11 LEDs

13 LEDs

15 LEDs

Typical Operating Characteristics

= V

DIM

= 48V, C

VCC

= 1µF, R

SENSE

= 0.62Ω, L = 220µH (connected between IN and CS). Typical values are at T

= +25°C,

unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10

MAX16822A/MAX16822B 1

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