PCA9624PW NXP Semiconductors, PCA9624PW Datasheet - Page 22

• Manufacturer Part Number: PCA9624PW
• Description: IC, LED DRIVER, RGBA, 24-TSSOP
• Manufacturer: NXP Semiconductors

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

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