PCA9952TW,118 NXP Semiconductors, PCA9952TW,118 Datasheet - Page 31

• Manufacturer Part Number: PCA9952TW,118
• Description: LED Lighting Drivers 16-ch Fm+ I2C-bus 57 mA LED driver
• Manufacturer: NXP Semiconductors

Specifications of PCA9952TW,118

• Rohs: yes
• Input Voltage: 3 V to 5.5 V
• Operating Frequency: 31.25 kHz
• Maximum Supply Current: 15 mA
• Output Current: 62 mA
• Mounting Style: SMD/SMT
• Package / Case: HTSSOP-28
• Factory Pack Quantity: 2500

NXP Semiconductors
10. Application design-in information
PCA9952_PCA9955
Product data sheet
10.1 Thermal considerations
Since the PCA9952/55 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
Fig 20. Typical application (PCA9955)
(1) A standard 10 k pull-up resistor is required to obtain the best system level ESD performance.
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 22 April 2013
16-channel Fm+ I
2
C-bus 57 mA constant current LED driver
PCA9955
PCA9952; PCA9955
© NXP B.V. 2013. All rights reserved.
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