LM2756_0712 NSC [National Semiconductor], LM2756_0712 Datasheet - Page 5

• Manufacturer Part Number: LM2756_0712
• Description: Multi-Display Inductorless LED Driver with 32 Exponential Dimming Steps in micro SMD
• Manufacturer: NSC [National Semiconductor]

Note 10: The maximum total output current for the LM2756 should be limited to 180mA. The total output current can be split among any of the three Groups
(I
proper current regulation. See the Maximum Output Current section of the datasheet for more information.
Note 11: For the two groups of current sinks on a part (GroupA and GroupB), the following are determined: the maximum sink current in the group (MAX), the
minimum sink current in the group (MIN), and the average sink current of the group (AVG). For each group, two matching numbers are calculated: (MAX-AVG)/
AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is considered the matching figure for the Group. The matching figure for a given part is
considered to be the highest matching figure of the two Groups. The typical specification provided is the most likely norm of the matching figure for all parts.
Note 12: For each Dxx pin, headroom voltage is the voltage across the internal current sink connected to that pin. For Group A, B, and C current sinks, V
V
Note 13: SCL and SDIO should be glitch-free in order for proper brightness control to be realized.
Note 14: SCL is tested with a 50% duty-cycle clock.
Block Diagram
DxA
OUT
= I
-V
DxB
LED
. If headroom voltage requirement is not met, LED current regulation will be compromised.
= I
DxC
= 30mA Max.). Under maximum output current conditions, special attention must be given to input voltage and LED forward voltage to ensure
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HRx
=