Texas Instruments Boost Controller for LED Backlighting LM3430EVAL/NOPB LM3430EVAL/NOPB Datenbogen
Produktcode
LM3430EVAL/NOPB
SO-8
S
S
S
G
D
D
D
D
MOSFET Footprints
6
MOSFET Footprints
The LM3430 evaluation board has a footprint for a single MOSFET with an SO-8 package using the
industry standard pinout. (See
industry standard pinout. (See
). This footprint can also accept newer MOSFET packages that are
compatible with SO-8 footprints.
Figure 5. SO-8 MOSFET Pinout
7
Permanent Components
The following components should remain the same for any new circuits evaluated on the LM3430
evaluation board.
evaluation board.
Name
Value
Cox, Cinx
0.1 µF
Cf
1 µF
Csns
1 nF
Rpd
10 k
Ω
Rs1
100
Ω
8
Additional Footprints
The 100 pF capacitor Csyc provides an AC input path for external clock synchronization. Detection of the
sync pulse requires a peak voltage level greater than 3.8V at the RT/SYNC pin. Note that the DC voltage
at RT/SYNC is approximately 2V to allow compatibility with 3.3V logic. The sync pulse width should be set
between 15 ns to 150 ns by the external components. The Rt resistor is always required, whether the
oscillator is free running or externally synchronized. Rt must be selected so that the free-running oscillator
frequency is below the lowest synchronization frequency.
sync pulse requires a peak voltage level greater than 3.8V at the RT/SYNC pin. Note that the DC voltage
at RT/SYNC is approximately 2V to allow compatibility with 3.3V logic. The sync pulse width should be set
between 15 ns to 150 ns by the external components. The Rt resistor is always required, whether the
oscillator is free running or externally synchronized. Rt must be selected so that the free-running oscillator
frequency is below the lowest synchronization frequency.
3
SNVA187C – January 2007 – Revised May 2013
AN-1529 LM3430 Evaluation Board
Copyright © 2007–2013, Texas Instruments Incorporated