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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
10. Application design-in information
V DD = 3.3 V or 5.0 V
1.1 kΩ
(optional)
UFm MASTER
USDA
USCL
RESET
USDA
USCL
RESET
V DD
LED0
LED1
LED2
up to 40 V
PCU9955
LED3
LED4
LED5
LED6
LED7
REXT
ISET
10 kΩ(1)
A0
LED8
LED9
LED10
LED11
A1
A2
LED12
LED13
A3
LED14
V SS
LED15
V SS
C
10 μF
002aaf106
(1) A standard 10 k ? pull-up resistor is required to obtain the best system level ESD performance.
Fig 17. Typical application
10.1 Thermal considerations
Since the PCU9955 device integrates 16 linear current sources, thermal considerations
should be taken into account to prevent overheating, which can cause the device to go
into thermal shutdown.
Perhaps the major contributor for device’s overheating is the LED forward voltage
mismatch. This is because it can cause significant voltage differences between the LED
strings of the same type (e.g., 2 V to 3 V), which ultimately translates into higher power
dissipation in the device. The voltage drop across the LED channels of the device is given
by the difference between the supply voltage and the LED forward voltage of each LED
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 2 October 2012
? NXP B.V. 2012. All rights reserved.
26 of 39
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