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Determining the String Power Supply Feedback Resistors
T he MSL3167/8 are designed to control LED string power supplies that use a voltage divider (R TOP and R BOTTOM in Figure
5) to set output voltage, and whose regulation feedback voltage is not more than 3.5V. To select the resisters, first
determine V OUT(MIN) and V OUT(MAX) , the minimum and maximum string supply voltage limits, using:
V OUT(MIN) = ( V f (MIN) *[# ofLEDs ] ) + 0.5 , and
V OUT(MAX) = ( V f (MAX) *[# ofLEDs ] ) + 0.5 ,
where V f(MIN) and V f(MAX) are the LED’s minimum and maximum forward voltage drops at the peak current set by R ILED
(page 9). For example, if the LED data are V f(MIN) = 3.5V and V f(MAX) = 3.8V, and 10 LEDs are used in a string, then the
total minimum and maximum voltage drops across a string are 35V and 38V, respectively. Adding an allowance of 0.5V
of for the string drive MOSFET headroom brings V OUT(MIN) to 35.5V and V OUT(MAX) to 38.5V. Do not to exceed the 40V
maximum specification of string drivers STR1 to STR15. Then, determine R TOP using:
R TOP =
V OUT (MAX) _ V OUT(MIN)
I FBO(MAX)
,
where I FBO(MAX) is the 255μA maximum output current of the Efficiency Optimizer output. Finally, determine R BOTTOM using:
R BOTTOM = R TOP *
V FB
V OUT(MAX) _ V FB
,
where V FB is the regulation feedback voltage of the power supply. Place a diode (1N4148 or similar) between FBO and
the supply’s feedback node to protect the MSL3167/8 against current flow into FBO (Figure 5).
Register Map and the EEPROM
Register Map Summary
The MSL3167/8 are controlled using the 96 registers in the range 0x00 - 0x5F. It may be convenient, and it is allowed, to
read and write to unused bits in this range when accessing registers, but do not change the default values of unused bits.
Three additional registers, 0x90, 0x91, and 0x93, allow access to the EEPROM and provide Efficiency Optimizer status. The
power-up default values for all control registers are stored within the on-chip EEPROM, and any of these EEPROM values may
be changed through the serial interface, as detailed in the full MSL3187/8 datasheet.
Table 2. Atmel LED Drivers-MSL3167/8 Register Map
ADDRESS AND
REGISTER NAME
FUNCTION
D7
D6
D5
REGISTER DATA
D4 D3
D2
D1
D0
0x00
0x01
CONTROL0
CONTROL1
LED string
enables
STR7EN
STR15EN
STR6EN
STR14EN
STR5EN
STR13EN
STR4EN
STR12EN
STR3EN
STR11EN
STR2EN
STR10EN
STR1EN
STR9EN
STR0EN
STR8EN
12
Atmel LED Drivers-MSL3167/MSL3168
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