PCA9955TW,118

Voltage - Output:	40V
Base Part Number:	PCA9955
Supplier Device Package:	28-HTSSOP
Package / Case:	28-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-20°C ~ 85°C (TA)
Applications:	Backlight
Dimming:	PWM
Frequency:	--
Current - Output / Channel:	57mA
Series:	--
Voltage - Supply (Max):	5.5V
Voltage - Supply (Min):	3V
Number of Outputs:	16
Internal Switch(s):	Yes
Topology:	--
Type:	Linear
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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PCA9955TW-118 Application Field and Working Principle

PCA9955TW-118 is a low power, high-brightness LED driver device, classified as Power Management Integrated Circuits (PMICs) - LED drivers mode, developed by NXP Semiconductors. By combining all the necessary functions and peripherals of a low power, high-brightness LED driver device into a single chip, NXP developed the PCA9955TW-118 for the most advanced and cost-effective solutions for any situation. The operation of the PCA9955TW-118 is based on a regulated constant current-source architecture that simplifies device design and improves system efficiency, and is designed to operate directly from standard Li-ion, Li-Po or any other specialized battery types, without the need for additional power conditioning circuits. With the help of a PWM input, the PCA9955TW-118 can regulate LED current up to a maximum of 30mA, enabling control of both brightness and also operational duration of the LED. The PCA9955TW-118 enables flexibility and cost optimization with configurable parameters offering better design flexibility matching the end-product requirements. Being a very versatile PMIC, it supports a variety of functions, such as temperature protection, thermal warning, over temperature shutdown, transient load protection and under-voltage lockout. This makes the PCA9955TW-118 suitable for applications like flash lights, illumination, outdoor signage and automotive interior/exterior lighting. The main applications of PCA9955TW-118 are in low power, high-brightness LED lighting control systems, where the device\'s constant current control integrated circuit is used to enable smooth, accurate, and efficient control of the LED brightness. The device also supports a wide operating temperature range from -40 C to 125 C, making it well-suited for use in extreme environments, which is particularly beneficial for applications like automotive interior/exterior lighting, flashlights and outdoor signage. The primary components of the PCA9955TW-118 are a constant current source, an op-amp or comparator, a control logic and latch, and an over-temperature circuit. The control logic is used to decide when the current source should be enabled or disabled, while the latch is used to hold the voltage levels. The over-temperature circuit acts as an emergency shut-off, preventing the device from burning out due to high temperatures. The PCA9955TW-118 also includes a robust design, supporting up to 5A current with a low dropout voltage of 0.7V. A programmable LED dimming circuit is also included, to allow for low power consumption and flicker free LED operation. Additionally, the PCA9955TW-118 has a built-in protection mechanism, to help protect the device from over-voltage, over-current and short-circuit events. To summarize, the PCA9955TW-118 is an ideal device for low power, high-brightness LED lighting systems and provides an efficient and cost-effective solution. It is ideally suited for applications in automotive interior/exterior lighting, flash lights and outdoor signage. The device includes a robust design, a way to control LED brightness and duration, a range of protection mechanisms, and a wide operating temperature range for use in extreme environments.

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