PCA9624PW NXP Semiconductors, PCA9624PW Datasheet - Page 22
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PCA9624PW
Manufacturer Part Number
PCA9624PW
Description
IC, LED DRIVER, RGBA, 24-TSSOP
Manufacturer
NXP Semiconductors
Datasheet
1.PCA9624BS118.pdf
(37 pages)
Specifications of PCA9624PW
No. Of Outputs
8
Output Current
100mA
Output Voltage
40V
Input Voltage
2.3V To 5.5V
Dimming Control Type
PWM
Driver Case Style
TSSOP
Switching Frequency
1MHz
Base Number
9624
Operating
RoHS Compliant
Led Driver Application
RGB Or RGBA LED Drivers, LED Status Information, Displays, Backlights
Rohs Compliant
Yes
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Manufacturer
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Price
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Part Number:
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NXP Semiconductors
PCA9624_2
Product data sheet
10.1.1 Example 1: T
10.1.2 Example 2: T
is known
This example uses a customer’s specific application of the PCA9626B, 24-channel LED
controller in the LQFP48 package, where only the case temperature (T
T
1. Find P
2. Find T
j
R
T
LED output low voltage (LED V
LED output current per channel = 80 mA
Number of outputs = 8
I
V
I
I
R
T
V
I
V
LED output voltage LOW = 0.5 V
LED output current:
I
I
= T
DD(max)
2
2
DD(max)
2
2
amb
case
DD(max)
C-bus clock (SCL) maximum sink current = 25 mA
C-bus data (SDA) maximum sink current = 25 mA
OL
DD(max)
C-bus maximum sink current on clock line = 25 mA
C-bus maximum sink current on data line = 25 mA
th(j-a)
th(j-c)
– output total power = 80 mA
– chip core power consumption = 10 mA
– SCL power dissipation = 25 mA 0.4 V = 10 mW
– SDA power dissipation = 25 mA 0.4 V = 10 mW
P
T
60 mA on 1 port = (60 mA
50 mA on 6 ports = (50 mA
40 mA on 2 ports = (40 mA
20 mA on 12 ports = (20 mA
1 mA on 3 ports = (1 mA
j
tot
case
= (T
of LED ~ 0.5 V
= 50 C
(measured) = 94.6 C
= (320 + 55 + 10 + 10) mW = 395 mW
= 18 C/W
= 108 C/W
+ R
= 10 mA
= 18 mA
j
amb
tot
= 5.5 V
= 5.5 V
(junction temperature):
(device total power dissipation):
th(j-c)
+ R
j
j
calculation of PCA9624DR, in TSSOP24 package, when T
calculation where only T
th(j-a)
P
tot
Rev. 02 — 26 August 2009
, where:
P
tot
) = (50 C + 108 C/W
3)
1)
OL
6)
2)
12)
) = 0.5 V
8
0.5 V = 320 mW
8-bit Fm+ I
case
5.5 V = 55 mW
is known
395 mW) = 92.7 C
2
C-bus 100 mA 40 V LED driver
PCA9624
case
© NXP B.V. 2009. All rights reserved.
) is known.
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amb