Rainbow-electronics MAX17127 Manual de usuario descargar pdf (Pagina 4)

4 ______________________________________________________________________________________

MAX17127

Six-String WLED Driver with Integrated

Step-Up Converter

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1. V

= 12V, C

COMP

= 0.51nF, C

COUT

= 4.7µF, R

COMP

= 82.5kΩ, R

ISET

= 180kΩ, R

FSLCT

= 100kΩ, L = 10µH,

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 5 26 V

Quiescent Current

MAX17127 is enabled, V

= 3.3V, V

= 26V 3.2 mA

MAX17127 is disabled, EN = AGND 15 µA

DDIO

Output Voltage

MAX17127 is enabled, V

= 3.3V,

5.4V < V

< 26V, 0A < I

VDDIO

< 10mA

4.85 5.15

MAX17127 is enabled , V

= 3.3V, V

= 5V,

VDDIO

= 10mA, dropout condition

4.6

EN = AGND, 0A < I

VDDIO

< 50FA 3.1 4.1

DDIO

Current Limit V

DDIO

is forced to 4.2V 25 70 mA

DDIO

UVLO Threshold Rising edge, typical hysteresis = 250mV 3.90 4.10 V

UVLO Threshold

Falling edge 4.3 4.7

Rising edge 4.55 4.95

BOOST CONVERTER

SW On-Resistance 20mA from SW to PGND 0.25 ω

SW Leakage Current 40V on SW, T

= +25NC 1 µA

Operating Frequency

FSLCT

= 100kI 0.95 1.05

MHz

FSLCT

= 400kI 0.225 0.28

FSLCT

Operative Range 90 500 kω

Maximum Duty Cycle At f

= 1MHz 92 %

Boost Output Voltage With suitable OVP network 45 V

Minimum On-Time (Note 1) 80 ns

CONTROL INPUT

PWM, EN Logic-Input High Level 2.1 V

PWM, EN Logic-Input Low Level 0.8 V

EN Pulldown Resistor 110 290 kω

FPO OUTPUT

FPO On Output-Voltage Low I

SINK

= 1mA, fault active 0.4 V

LED CURRENT

Full-Scale FB_ Output Current

ISET

= 120kI 29.1 30.9

ISET

= 180kI 19.4 20.6

ISET

= 360kI 9.7 10.3

ISET

< 0.7V 0.2 0.4

ISET

Range

Operating range 100 400

kω

Accuracy = 3% 120 360

Current Regulation Between

Strings

10mA < I

FB_

< 30mA -2.0 +2.0 %

Minimum FB_ Regulation Voltage

FB_

= 30mA 400 770

mVI

FB_

= 20mA 670

FB_

= 10mA 630

FB_ On-Resistance V

FB_

= 50mV (includes 10I sense resistor) 28.4 ω

FB_ Bias Current V

FB_

= 40V, T

= +25NC 1 µA

1 2 3 4 5 6 7 8 9 ... 21 22

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Rainbow-electronics MAX17127 Manual de usuario Pagina 4

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