Rainbow-electronics MAX17061 Manual de usuario descargar pdf (Pagina 6)

MAX17061

8-String White LED Driver with

SMBus for LCD Panel Applications

6 _______________________________________________________________________________________

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

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

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

= 12V, C

CCV

= 0.022µF, R

CCV

= 5.1kΩ, V

ISET

= V

OSC

= V

, R

FSET

= 464kΩ, V

PWMI

= GND,

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

= +25°C.) (Note 2)

PARAMETER CONDITIONS MIN TYP MAX UNITS

FAULT PROTECTION

OV Threshold Voltage Rising edge, typical hysteresis = 60mV 1.166 1.306 V

FB_ Overvoltage Threshold 5.2 6.0 V

FB_ Undervoltage Threshold 130 220 mV

OV Undervoltage Threshold

(Boost Global Fail)

48 120 mV

Over cur r ent FAU LT S hutd ow n Ti m er I

PEAK

> 3.3A at duty = 0% 88 168 µs

FB_ Overvoltage Fault Timer 1.6 2.4 ms

PWM FILTER

PWM Output Impedance 20 60 kΩ

FSET

= 464kΩ 197 203 kHz

FSET

= 113kΩ 750 820 HzDPWM Oscillator Frequency

FSET

= 65kΩ 1.27 1.40 kHz

PWMI Input Frequency Range 5 100 kHz

PWMI Full-Range Accuracy 5 LSB

PWMI duty cycle = 100% 98

PWMI duty cycle = 50% 48 52

PWMI Brightness Setting

PWMI duty cycle = 0% 2.6 2.8

SMBus TIMING SPECIFICATION

SMBus Frequency FSMB 10 100 kHz

Bus Free Time TBUF 4.7 µs

START Condition Hold

Time from SCL

THD:STA 4

µs

START Condition Setup

Time from SCL

TSU:STA 4.7

µs

STOP Condition Setup

Time from SCL

TSU:STO 4

µs

SDA Hold Time from SCL THD:DAT 300 ns

SDA Setup Time from SCL TSU:DAT 250 ns

SCL Low Period T

LOW

4.7 µs

SCL High Period T

HIGH

4 µs

1 2 3 4 5 6 7 8 9 10 11 ... 25 26

MAX17061 1

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Rainbow-electronics MAX17061 Manual de usuario Pagina 6

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