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S P 7 6 8 6 / S P 7 6 8 6 A
C o n s t a n t C u r r e n t F l a s h D r i v e r i n D F N 2 m m x 3 m m
Part Reference
Value
Tolerance
Size
Manufacturers
RSENSE
RSENSE
RSENSE
RSENSE
RSENSE
RSENSE
RSENSE
0.22ohms
0.27ohms
0.33ohms
0.39ohms
0.47ohms
0.56ohms
0.68ohms
1%
1%
1%
1%
1%
1%
1%
or
or
or
or
or
or
or
5%
5%
5%
5%
5%
5%
5%
0603
0603
0603
0603
0603
0603
0603
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
or
or
or
or
or
or
or
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Table 2: Resistor Selection
R ESISTOR S ELECTION FOR SP7686
The SP7686 part uses an internal 5 bit DAC to
set the LED current. The DAC input is at the
CTRL pin. The user inputs a pulse train of up
to 1MHz to set the LED current. The DAC sets
the feedback voltage point from 58mV to
350mV in 9.7mV steps. The LED current is
determined by the equation:
I LED = V FB /R SENSE
The curves below show the feedback and LED
currents for the CTRL pin pulse count and
standard R SENSE resistor values.
After the desired count is reached the CTRL
input must remain high to hold the count. If
the CTRL pin goes low for more than 200 μ s
the part will shutdown. See the timing
diagrams in the Typical Performance
Characteristics. The first pulse turns on the
SP7686. The first pulse needs to occur at
least 600 μ sec after V IN is applied in order to
activate after the power on reset (POR). The
second pulse resets the DAC to 0. The timing
between the first and second pulse needs to
be 25 μ sec typical to as long as 75 μ sec. After
the second pulse the feedback voltage
remains at ground. The third pulse sets the
feedback voltage to 58mV. Subsequent pulses
set the feedback voltage in 9.7mV steps as
shown previously in the Typical Performance
Characteristics.
? 2010 Exar Corporation
13/16
Rev. 2.1.0
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