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Date: 6/20/06 Rev T SP7685, 1.2A Buck/BoostCharge Pump LED Driver © 2006 Sipex Corporation
EVALUATION BOARD CIRCUIT LAYOUT
Table 2: Resistor values and sizes
Watt pulsed power, more than enough for
this application. For other applications, the
P
FLASH
power can be calculated and resistor
size selected. The R
SENSE
resistor is recom-
mended to be size 0603 for most applica-
tions. The range of typical resistor values
and sizes are shown here in Table 2.
COMPONENT SELECTION
Part Reference Value Tolerance Size Manufacturers
RSET 33kΩ 5% 0402 any
RSET 39kΩ 5% 0402 any
RSET 43kΩ 5% 0402 any
RSET 47kΩ 5% 0402 any
RSET 56kΩ 5% 0402 any
RSET 62kΩ 5% 0402 any
RSET 68kΩ 5% 0402 any
RSET 82kΩ 5% 0402 any
RSET 100kΩ 5% 0402 any
RSET 110kΩ 5% 0402 any
RSET 120kΩ 5% 0402 any
RSET 150kΩ 5% 0402 any
RSENSE 0.22Ω 5% 0603 Panasonic or Vishay
RSENSE 0.27Ω 5% 0603 Panasonic or Vishay
RSENSE 0.33Ω 5% 0603 Panasonic or Vishay
RSENSE 0.39Ω 5% 0603 Panasonic or Vishay
RSENSE 0.47Ω 5% 0603 Panasonic or Vishay
RSENSE 0.56Ω 105% 0604 Panasonic or Vishay
RSENSE 0.68Ω 205% 0605 Panasonic or Vishay
