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Detailed Description
Internal Regulators and Enable Input
Built-in current control MOSFETs capable of withstanding
up to 40V provide a compact solution. The Efficiency
Optimizer circuit controls the LED voltage generated
by an external DC-DC converter to minimize losses on
Setting the Maximum LED String Current
The maximum I ILED current for the 16 LED strings STR0
to STR15 is set by external resistor R ILED from the ILED
pin to GND and is determined by the equation:
the current control MOSFETs, improving efficiency and
reducing driver power dissipation. The MSL3162 uses
a high-speed, 1MHz I 2 C serial interface to control LED
current, PWM dimming, and fault detection circuitry,
I ILED =
2050
R ILED
making it an optimal solution for driving LED backlights
for LCD panels. Onboard EEPROM allows default settings
to be reconfigured for customization and settings to be
saved at turn-off, eliminating the need to re-write settings
at the next turn-on. The tiny, 6mm x 6mm QFN package
enables a compact solution while maintaining high power
dissipation.
Internal Regulators and Enable Input
The MSL3162 includes an internal linear regulator that
provides 2.5V supply voltage to power internal circuitry.
Bypass VDD to GND with a 1μF or greater capacitor as close
to the MSL3162 as possible.
The EN input turns the MSL3162 on and off. To turn
on the MSL3162, drive EN high with a 5V logic level,
and drive EN low to turn it off. When EN is low, the
MSL3162 enters low-power mode, reducing input
current to 20μA, and turns off the serial interface. For
automatic start-up, connect EN to VIN, allowing the
MSL3162 to start automatically when voltage is applied.
LED String Current Control
Each MSL3162 includes 16 current sink outputs, rated
at 40V, each capable of sinking up to 100mA through a
string of series connected LEDs. The internal Efficiency
Optimizer circuit controls the LED voltage, minimizing
power dissipated in the current sinks while maintaining
high current-regulation accuracy. The MSL3162 power
dissipation is limited to 2.1W. When using all 16 current
sinks, maintain the total power dissipation within power
dissipation limits.
14
where I ILED is in mA and R ILED is in k Ω .
R ILED =34.8k Ω sets the full-scale LED current to 58.9mA.
R ILED =20.5k Ω sets the full-scale LED current to 100mA,
the maximum allowed. The currents for the 16 LED
strings, STR0 to STR15, are reduced individually from
full scale with 6-bit resolution using the LED string
current control registers.
If I ILED for the 16 LED strings, STR0 to STR15, is chosen
to be 30mA or lower (by selecting the value of external
resistor R ILED to be greater than 68.3k Ω ), then the
values programmed into the LED string current control
registers must be limited to the range 0x00 to 0x1F.
The full range of 0x00 to 0x3F is only available if I ILED is
set to be greater than 30mA by using an R ILED value of
68.3k Ω or lower.
Atmel LED Driver-MSL3162
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相关PDF资料
MSL3164BT
IC LED DRIVER 16 STRING
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IC LED DRIVER 16 STRING
MT-6 PLUS
SURGE SUPPR TCHMSTR 6OUT 10'CORD
MT42L256M32D4KP-3 IT:A
IC LPDDR2 SDRAM 8GBIT 168FBGA
MT45W1MW16BDGB-708 AT
IC PSRAM 16MBIT 104MHZ 54VFBGA
MT48H32M16LFB4-75B IT:C
IC SDRAM 512MB 54VFBGA
MT48H8M16LFB4-75 IT:K TR
IC SDRAM 128MBIT 133MHZ 54VFBGA
MTC100-JA2-P34
CONTACT INSERT PIN
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