Rainbow-electronics MAX16820 Manual de usuario descargar pdf (Pagina 3)

MAX16819/MAX16820

2MHz High-Brightness LED Drivers with

High-Side Current Sense and 5000:1 Dimming

_______________________________________________________________________________________ 3

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GATE DRIVER

Gate Driver Source Current V

CSN

= V

, V

DRV

= 0.5 x V

0.5 A

Gate Driver Sink Current V

CSN

= V

- 250mV, V

DRV

= 0.5 x V

Gate Driver Output-Voltage High V

DRV

= 10mA V

- 0.5 V

Gate Driver Output-Voltage Low V

DRV

= -10mA 0.5 V

DIM INPUT

Maximum DIM Frequency f

DIM

20 kHz

DIM Input-Voltage High V

CSN

= V

, increase DIM until V

DRV

- 0.5V)

2.8 V

DIM Input-Voltage Low V

CSN

= V

, decrease DIM until

DRV

< 0.5V

0.6 V

DIM Hysteresis DIM

HYS

200 mV

DIM Turn-On Time t

DIMON

DIM rising edge to V

DRV

= 0.5 x V

DRV

= 1nF

100 ns

DIM Turn-Off Time t

DIMOFF

DIM falling edge to V

DRV

= 0.5 x V

DRV

= 1nF

100 ns

DIM Input Leakage High V

DIM

= V

10 µA

DIM Input Leakage Low V

DIM

= 0V -1 +1 µA

REGULATOR

VCC

= 0.1mA to 10mA, V

= 5.5V to 28V 4.5 5.5 V

Regulator Output Voltage V

VCC

= 0.1mA to 10mA, V

= 4.5V to 28V 4.0 5.5 V

Load Regulation I

VCC

= 0.1mA to 10mA, V

= 12V 4 Ω

Line Regulation V

= 6V to 28V, I

VCC

= 10mA 11 mV

Power-Supply Rejection Ratio PSRR V

= 12V, I

VCC

= 5mA, f

= 10kHz -35 dB

= 4.5V, V

= 0V 45 mA

Current Limit I

LIM

= 4.5V, V

= 4V 18 mA

Regulator Startup Time t

STRAT

= 0 to 4.5V 350 µs

ELECTRICAL CHARACTERISTICS (continued)

= 12V, V

DIM

= V

, C

VCC

= 1µF, R

SENSE

= 0.5Ω, T

= T

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

= +25°C.) (Note 1)

Note 1: All devices are 100% production tested at T

= +25°C and +125°C. Limits to -40°C are guaranteed by design.

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MAX16819/MAX16820 1

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Rainbow-electronics MAX16820 Manual de usuario Pagina 3

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