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NXP Semiconductors
PCA9624
8-bit Fm+ I 2 C-bus 100 mA 40 V LED driver
10.1.1 Example 1: T j calculation of PCA9624DR, in TSSOP24 package, when T amb
is known
R th(j-a) = 108 ? C/W
T amb = 50 ? C
LED output low voltage (LED V OL ) = 0.5 V
LED output current per channel = 80 mA
Number of outputs = 8
I DD(max) = 10 mA
V DD(max) = 5.5 V
I 2 C-bus clock (SCL) maximum sink current = 25 mA
I 2 C-bus data (SDA) maximum sink current = 25 mA
1. Find P tot (device total power dissipation):
– output total power = 80 mA ? 8 ? 0.5 V = 320 mW
– chip core power consumption = 10 mA ? 5.5 V = 55 mW
– SCL power dissipation = 25 mA 0.4 V = 10 mW
– SDA power dissipation = 25 mA 0.4 V = 10 mW
P tot = (320 + 55 + 10 + 10) mW = 395 mW
2. Find T j (junction temperature):
T j = (T amb + R th(j-a) ? P tot ) = (50 ? C + 108 ? C/W ? 395 mW) = 92.7 ? C
10.1.2 Example 2: T j calculation where only T case is known
This example uses a customer ’s specific application of the PCA9624PW, 8-channel LED
controller in the TSSOP24 package, where only the case temperature (T case ) is known.
T j = T case + R th(j-c) ? P tot , where:
R th(j-c) = 30 ? C/W
T case (measured) = 94.6 ? C
V OL of LED ~ 0.5 V
I DD(max) = 10 mA
V DD(max) = 5.5 V
LED output voltage LOW = 0.5 V
LED output current:
60 mA on 1 port = (60 mA ? 1)
50 mA on 6 ports = (50 mA ? 6)
40 mA on 1 port = (40 mA ? 1)
I 2 C-bus maximum sink current on clock line = 25 mA
I 2 C-bus maximum sink current on data line = 25 mA
PCA9624
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 6 September 2012
? NXP B.V. 2012. All rights reserved.
21 of 37
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