MAX8790 Просмотр технического описания (PDF) - Maxim Integrated

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производитель

MAX8790

Six-String White LED Driver with Active Current Balancing for LCD Panel Applications

Maxim Integrated 

MAX8790

Six-String White LED Driver with Active

Current Balancing for LCD Panel Applications

Electrical Characteristics (continued)

(Circuit of Figure 1. VIN = 12V, VSHDN = VIN, CCV = 0.1μF, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)

PARAMETER

LED CURRENT

Full-Scale FB_ Output Current

ISET High-Level Threshold

CONDITIONS

ISET = VCC, BRT = 100%

RISET = 80kΩ to GND, BRT = 100%

RISET = 133kΩ to GND, BRT = 100%

Default setting for 20mA full-scale LED current

ISET Voltage

20% Output Current

Current Regulation Between

Strings

Minimum FB_ Regulation Voltage

Maximum FB_ Ripple

FB_ On-Resistance

FB_ Leakage Current

BRT Input Frequency

FAULT PROTECTION

OV Threshold Voltage

ISET = VCC, BRT = 20%

ISET = VCC, BRT = 100%

ISET = VCC, BRT = 20%

RISET = 80kΩ to GND, BRT = 100%

ISET= VCC, BRT = 100%

ISET = VCC, BRT = 12.5%

ISET= VCC, COUT = 1µF, OSC = VCC (Note 1)

VFB_ = 50mV

SHDN = GND, VFB_ = 26V

SHDN = VIN, BRT = GND, VFB_ = 15V

FB_ Overvoltage Threshold

FAULT Shutdown Timer

PHASE-LOCKED LOOP

VFB_ > 5.6V (typ)

FSET High-Level Threshold

PLL disabled

BRT Frequency Capture Range

RFSET = 500kΩ

RFSET = 250kΩ

Note 1: Specifications are guaranteed by design, not production tested.

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

MIN TYP MAX

19.2

20.8

24.0

26.0

14.4

15.6

VCC -

0.4

1.12

1.26

3.8

4.2

-2

+2

-3

+3

280

840

250

760

140

530

200

20

1

28

100

500

1.16

VCC +

0.2

50

1.30

VCC +

1.45

80

VCC -

0.4

150

250

300

500

UNITS

mA

V

V

mA

%

mV

mVP-P

Ω

µA

Hz

V

V

ms

V

Hz

Hz

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