Rainbow-electronics MAX6948B Manual de usuario descargar pdf (Pagina 4)

High-Efficiency PWM LED Driver with Boost

Converter and Five Constant-Current GPIO Ports

MAX6948B

ELECTRICAL CHARACTERISTICS (continued)

(Typical Application Circuit, V+ = 2.7V to 5.0V, V

= 1.7V to V+, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

V+ = 3.3V, V

= 2.5V, T

= +25NC.) (Note 4)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BOOST CONVERTER

Undervoltage Lockout Threshold V

UVLO

V+ rising 2.65

V+ falling 2.3

Undervoltage Lockout Threshold

Hysteresis

HYS

30 mV

Continuous Output Current I

WLED

100% boost LED PWM, full-current setting,

= 6.67I, I

WLED

= V

30 mA

Operating Current

Run bit = 1, boost standby bit = 0, 0%

boost LED PWM

2 mA

LX Current Limit V+ = 3.3V, T

= +25°C 430 500 570 mA

LX Saturation Voltage I

= 200mA 0.1 0.25 V

LX Leakage Current I

LXOFF

0% boost LED PWM, V

= 10V 8 FA

OUT Leakage Current I

OUTOFF

OUT

= 28V, boost converter in shutdown 16 23 FA

Operating Frequency f

BOOST

2 MHz

Minimum Duty Cycle

Continuous conduction mode 10

Discontinuous conduction mode 0

Maximum Duty Cycle 95 %

GM Amplifier Transconductance 250 FS

FB Leakage Current I

= 100mV ±0.01 Q1 FA

Feedback Output Voltage V

Half-current setting, V+ = 3.3V, T

= +25°C 94 100 106

Full-current setting, V+ = 3.3V, T

= +25°C 190 200 210

Half-current setting 90 100 110

Full-current setting 175 200 225

Quick-Start Charge Current I

150 FA

Quick-Start Time

From enable command STOP condition to

output regulation, C

COMP

= 0.047FF

(Note 7)

3.5 5 ms

Shutdown Discharge Resistance R

COMP

20 kI

Output Current Line Regulation 3.0V < V+ < 5.0V 2 %/V

Thermal Shutdown Threshold 150 NC

Thermal Shutdown Threshold

Hysteresis

9 NC

Overvoltage Threshold V

OUT

Rising 28 29 30 V

Overvoltage Threshold

Hysteresis

OV_HYS

4 V

SERIAL INTERFACE (SDA, SCL, AD0, RST)

Input High Voltage V

IH2

0.7 x

Input Low Voltage V

IL2

0.3 x

Input Leakage Current I

IN2

0.03 FA

Output Low Voltage SDA V

OL2

SINK

= 6mA 0.3 V

Input Capacitance C

IN2

10 pF

1 2 3 4 5 6 7 8 9 ... 27 28

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Rainbow-electronics MAX6948B Manual de usuario Pagina 4

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