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R Sn =
0 . 5
I LEDn
R TOP =
V OUT ( MAX ) ? V OUT ( MIN )
I FBOn ( MAX )
Setting the Maximum LED String Current with
the Source Resistor
The maximum string current, I LEDn , for each string is
set by a shunt resistor connected to ground from
the Source terminal of the string drive MOSFET. The
feedback threshold is 500mV. Determine the resistor
value using:
?. .
For example, a full-scale LED current of 100mA returns
R Sn = 5 Ω . The current for all LED strings is reduced from
full-scale value with 8-bit resolution using ISTR, the
String Current Control register 0x31.
Connecting the Efficiency Optimizer to an LED
String Power Supply and Selecting Resistors
The MSL2162 is designed to control LED string power
supplies that use a voltage divider (R TOP and R BOTTOM in
Figure 4) 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 Sn (page 10). For example, if the LED data
are V f(MIN) = 3.5V and V f(MAX) = 3.8V, and ten LEDs are
used in a string, then the total minimum and maximum
voltage drop across a string is 35V and 38V. 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. Then determine R TOP using:
,
where I FBOn(MAX) is the 255μA maximum output current
of the Efficiency Optimizer outputs FBOn. Finally,
determine R BOTTOM using:
R BOTTOM = R TOP *
V OUT(MAX) _ V FB
VOUT
POWER
SUPPLY
FB
R TOP
R BOTTOM
COUT
1N4148
FBOn
G0
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
R S0
MSL2162
G15
R S15
Figure 4. FBOn Connects to the Power Supply Voltage Divider
Through a Diode
18
protect the MSL2162 against current flow into FBOn.
Assign all strings powered by a common supply to the
proper FBO output using String Set registers 0x40 -
0x5F; default assignments are presented in Table 5.
Once configured, determine the change in power supply
output voltage in response to a change in FBO output
current using:
? V OUT = ? I FBO ? R TOP .
Atmel LED Driver-MSL2162
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