OC5217 is an original step-down and constant current IC chip, which has the characteristics of high efficiency, stability and safety, and is widely used in various LED lighting, power adapters, mobile power supplies and other fields.
The chip uses advanced step-down technology to achieve stable control of the output voltage when the input voltage is high. At the same time, it also has a constant current function, which can automatically adjust the output current according to the change of load current to ensure the stable operation of loads such as LED lamps.
In addition, the OC5217 also has over-temperature protection, over-current protection and other functions, which can effectively protect the safety of circuits and loads. At the same time, it also has a small size and low power consumption, which is convenient for users to use in various application scenarios.
The OC5217 is a continuous inductor current on-mode step-down LED constant current driver for driving one or more LED strings. The OC5217 operates from 55V to 30V with adjustable output current up to 800mA. Depending on the input voltage and external components, the OC5217 can drive LEDs up to tens of watts.
The OC5217 features a built-in power switch with high-end current-sense circuitry and a dimming foot DIM that is compatible with PWM and analog dimming. When the DIM pin voltage is lower than 0At 3V, the output is turned off and enters the standby state.
The OC5217 has a built-in over-temperature protection circuit, and when the chip reaches the over-temperature protection point and enters the over-temperature protection mode, the output current gradually decreases to improve system reliability. The OC5217 uses a patented circuit architecture that enables no overshoot of the output current when operating at low dropout voltages, improving the operating life of the LEDs, and the OC5217 uses a patented constant current circuit with excellent load regulation and linearity regulation.
The OC5217 is available in an SOT23-5 package.
Maximum output current: 800mA
High efficiency: 96%.
Excellent load regulation and linear regulation.
High-end current sensing.
Maximum brightness control frequency: 20kHz
Hysteresis control without loop compensation.
Maximum working frequency: 1MHz
Current accuracy: 3%.
Wide Input Voltage: 55v~30v
Intelligent over-temperature protection.
Low dropout pressure without overshoot.
LED backup light, signal light.
Low-voltage LED spotlights replace halogen lamps.
Automotive lighting. 
The OC5213 is a high-efficiency step-down LED constant current driver IC that can be used to drive applications such as LED lighting fixtures and displays. It features a highly efficient step-down topology that provides stable output current over a wide input voltage range and a variety of protection features.
The input voltage range of the OC5213 chip is 55V to 30V, can adapt to different supply voltages.
With an output current of up to 800mA, the OC5213 chip can meet the needs of different LED lighting fixtures and displays.
The OC5213 chip uses a high-efficiency step-down topology and PWM modulation technology with up to 95% conversion efficiency to save energy and reduce heat generation.
The OC5213 chip has a variety of protection functions, including over-temperature protection, over-current protection, under-voltage protection and short-circuit protection, etc., which can protect the safe operation of LED lighting fixtures and displays.
The OC5213 chip adopts constant current control technology, which can control the output current through an external resistor or current sensing resistor, so as to realize the brightness adjustment of LED lighting fixtures and displays.
The OC5213 chip is packaged in an SOT23-5 package and is compact for easy installation and layout.
The OC5213 chip is suitable for LED lighting fixtures, signal lights, backup lights, automotive lighting and other applications, with the characteristics of high efficiency, stability and reliability.
A customer uses OC5217 to drive 1 LED lamp, the quota current is 60mA, 12V input, and when it lights up after powering on, the LED light burns off, and feedback to us to analyze the reason.
The analysis process is as follows:
1. After powering on, the lamp will be burned when it is turned on, and it is initially suspected that it is caused by excessive current, and the customer is required to provide the specific parameters of the circuit design
2. The customer feedback sampling resistance value used is 05ω；
3. Check the specifications, the relationship between the output current and the sampling resistance is as follows:
4. Replace rcs=05 Bringing the above equation in, it can be calculated that the output current reaches 200mA, which far exceeds the 60mA of the LED quota current.
5. Feedback to customers, the size of the sampling resistance needs to be adjusted to avoid excessive output current. After the customer selects the appropriate sampling resistance value, the circuit works normally.
Summary: The current output of OC5217 is controlled by RCS, and it is necessary to select an appropriate resistance value to avoid excessive output current and burn out the LED lamp beads.