STP04CM05B1R

Voltage - Output:	19V
Base Part Number:	STP04CM05
Supplier Device Package:	14-DIP
Package / Case:	14-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C (TA)
Applications:	--
Dimming:	--
Frequency:	30MHz
Current - Output / Channel:	400mA
Series:	--
Voltage - Supply (Max):	5.5V
Voltage - Supply (Min):	3.3V
Number of Outputs:	4
Internal Switch(s):	Yes
Topology:	Shift Register
Type:	Linear
Part Status:	Obsolete
Packaging:	Tube

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Overview

The STP04CM05B1R is a 1A low-dropout, step-down LED driver with internal switched-mode lighting and constant output voltage. It is specifically designed for LED applications and provides efficient, stable and reliable operation up to 1.2A and up to 36V output. The STP04CM05B1R is covered by the PMIC (power management integrated circuit) category, specifically LED drivers. It has wide input voltage range of up to 40V and low quiescent current extending the life cycle of products.The main reason this device is categorised as an LED driver is because of its high accuracy of 2.3% (typical) constant output voltage, wide input and output voltage range, fast current limit/thermal limit and its operating temperature range from -40°C to +105°C.

Application Fields

The STP04CM05B1R LED driver provides a wide range of applications. It is mainly used for power efficiency in the automotive industry, where low quiescent current and high efficiency are desired. It is also applicable to the industrial and embedded system markets, where constant output voltage is needed. This device is also well suited for industrial lighting, monitors, LCDs, projectors, digital TVs and small appliances. It is also suitable for applications using lead acid batteries, particularly EVs, hybrid vehicles and boats. Other applications include portable electronics, such as mobile phones, gaming consoles and tablets. It is even applicable to medical equipment, flashlights and measuring instruments.

Working Principle

The STP04CM05B1R LED driver operates based on the PFM (pulse frequency modulation) control method. It takes the input voltage and decreases it to the desired output voltage with a high level of accuracy.The PFM control method works by applying current pulses across an inductor and using the instant output voltage to adjust the width of these pulses. The output voltage is sensed and regulated by an internal voltage feedback loop. The duty cycle of the pulses is determined by this feedback loop to ensure the output voltage is correctly maintained. When the duty cycle of these pulses increases, the power switches reduce frequency, allowing energy to be stored in the inductor and reducing power loss. This also increases the efficiency of the switching power supply, resulting in improved efficiency and regulation.

Conclusion

The STP04CM05B1R is a versatile 1A low-dropout, step-down LED driver under the PMIC (power management integrated circuit) category, specifically LED drivers. It is designed for wide input and output voltage range and high accuracy of 2.3% (typical) constant output voltage. Its wide applications include automotive, industrial, embedded system markets and portable electronics. It operates under the PFM (pulse frequency modulation) control method that takes the input voltage and decreases it to the desired output voltage. Its duty cycle of these pulses is determined by a feedback loop to ensure that output voltage is correctly maintained, which leads to improved efficiency and regulation.

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