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CN5815 Datasheet(PDF) 11 Page - Shanghai Consonance Electronics Incorporated

Part No. CN5815
Description  4.5V to 32V Input, Constant Current Boost HB LED Driver
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Maker  CONSONANCE [Shanghai Consonance Electronics Incorporated]
Homepage  http://www.consonance-elec.com/
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CN5815 Datasheet(HTML) 11 Page - Shanghai Consonance Electronics Incorporated

 
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CONSONANCE
www.consonance-elec.com
11
REV 1.0
Where,
is equal to 3.14
fSW is the converter’s switching frequency, fSW=330KHz
R1 and R2 are the feedback resistors shown in Figure 1
C5’s capacitance can not be much larger than the value calculated from the above equation, otherwise the output
voltage may go so high that damage may be caused when LEDs are open circuit.
Board Layout Considerations
Careful PCB design is very important for correct function and good performance. For the application circuit
shown in Figure 1, the following suggestions should be followed.
All connections carrying large pulsed currents must be very short and as wide as possible. The inductance
of these connections must be kept to an absolute minimum due to the high di/dt of the currents in the boost
LED driver. This implies that the CIN, inductor, MOSFET, diode and COUT should be placed in a compact
area. Additionally, small current loop areas reduce radiated EMI.
The copper plane of the MOSFET should be minimized as much as possible for less EMI.
The ground plane for the power section of the converter should be kept separate from the analog ground
plane. This implies that the negative terminal of CIN, COUT and current sense resistor RSW, RCS must be close
together.
The CN5815’s GND pin and the negative terminal of R2, C1, C2, C3 and C4 in Figure 1 should be
connected together and return to the system ground separately.
For higher LED current, multi-layer PCB is recommended.
Place R1, R2, R3, R4, C1,C2, C3 and C4 as close to the CN5815 as possible.


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