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CXSD62666 is a high-performance synchronous buck DC-DC converter for industrial and automotive electronics fields. It adopts a 120KHz fixed frequency control architecture, supports 5-45V ultra wide input voltage, can output precise voltage of 1.25-40V, maximum continuous current of 4A, output power of 50W, and efficiency of over 96%. Integrated constant voltage (CV) and constant current (CC) dual loop control, built-in full compensation module, reducing the number of peripheral components by 30%, significantly reducing system costs and saving 60% PCB space, suitable for high-density power supply design requirements.

   Product Features;Return to TOPOLv嘉泰姆

Core Technology Highlights

High efficiency power managementOLv嘉泰姆

• 120KHz fixed switching frequencyAutomatic frequency reduction to 30KHz protection during short circuit
• Dual mode controlConstant voltage/constant current adaptive switching, feedback accuracy± 2%
• Built in synchronous rectification MOSFET, supporting 100% duty cycle continuous output

Multiple industrial grade protectionsOLv嘉泰姆

• Triple safety protection: overcurrent/short circuit/overheating protection (wide temperature range of -40 ℃~125 ℃)
• Class 3A ESD protection (HBM 16kV), anti-interference ability increased by 40%
• Dynamic current limiting function, adapted to load mutation scenarios

Industrial and automotive grade reliabilityOLv嘉泰姆

• AEC-Q100 Grade 1 certification (-40 ℃~125 ℃)
• TO263-7L package optimized thermal management, with a junction temperature resistance of up to 150 ℃
• Compatible with 12V/24V/48V battery system, compatible with car and industrial power sources

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✔& nbsp;Automotive Electronics: Car navigation system, ADAS module, BMS power supplyOLv嘉泰姆
✔& nbsp;industrial controlPLC controller, industrial robot, motor driveOLv嘉泰姆
✔& nbsp;communication equipment5G base station, fiber optic communication module, POE switchOLv嘉泰姆
✔& nbsp;Internet of Things: edge computing nodes, high power sensor networksOLv嘉泰姆

   Technical Specifications (Product PDF)Return to TOP OLv嘉泰姆

      For detailed PDF specifications, please scan WeChat to contact us. You can also receive free samples and technical support！OLv嘉泰姆

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   Circuit schematic diagram;Return to TOPOLv嘉泰姆

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Bill of MaterialsOLv嘉泰姆
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DEMO physical imageOLv嘉泰姆
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PCB layoutOLv嘉泰姆
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Typical performance parametersOLv嘉泰姆
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Application InformationOLv嘉泰姆
Input capacitor selection;OLv嘉泰姆
In continuous mode, the input current of the converter is a set of square waves with a duty cycle of approximately VOUT/VIN.OLv嘉泰姆
To prevent large transient voltages, it is necessary to choose a low ESR for the maximum RMS current requirementOLv嘉泰姆
(Equivalent series resistance) input capacitor. For most applications, a 220uF input is requiredOLv嘉泰姆
A capacitor is sufficient, and its placement should be as close as possible to the position of CXSD62666. mostOLv嘉泰姆
The current of a large RMS capacitor is given by the following equation:OLv嘉泰姆

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Among them, the maximum average output current IMAX is equal to the difference between the peak current and 1/2 of the peak ripple current,OLv嘉泰姆
IMAX=ILIM - △ IL/2. It is also recommended to increase the input capacitance when ceramic capacitors are not usedOLv嘉泰姆
Add a ceramic capacitor ranging from 0.1uF to 1uF for high-frequency decoupling.OLv嘉泰姆
Output capacitor selection;OLv嘉泰姆
Low ESR capacitors should be selected at the output end to reduce output ripple voltage. Generally, once the capacitorOLv嘉泰姆
If ESR is met, the capacitor is sufficient to meet the demand. The ESR of any capacitor, along with its own capacityOLv嘉泰姆
A zero point will be generated for the system, and the larger the ESR value, the lower the frequency range in which the zero point is located, while the ceramic electricOLv嘉泰姆
The zero point of the capacitance is at a relatively high frequency, which can usually be ignored and is a good choice, butOLv嘉泰姆
Compared with electrolytic capacitors, high-capacity and high-voltage ceramic capacitors have a larger volume and higher cost, thereforeOLv嘉泰姆
Combining 0.1uF to 1uF ceramic capacitors with low ESR electrolytic capacitors is a good choice.OLv嘉泰姆
The output voltage ripple is determined by the following equation:OLv嘉泰姆

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F in the formula: switching frequency, COUP: output capacitor, △ IL: ripple current in the inductor.OLv嘉泰姆
Inductance selection;OLv嘉泰姆
Although inductors do not affect the operating frequency, the inductance value has a direct impact on ripple current,OLv嘉泰姆
The inductance ripple current △ IL decreases with the increase of inductance value and increases with the increase of VIN and VOUTOLv嘉泰姆
Increase. A reasonable starting point for setting ripple current is △ IL=0.3 * ILIM, where ILIMOLv嘉泰姆
Limit the peak switch current. In order to ensure that the ripple current is below a specified maximum valueOLv嘉泰姆
Choose the inductance value according to the following formula:OLv嘉泰姆

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PCB Layout GuideOLv嘉泰姆
1. Power lines such as VIN, GND, SW, VOUT, etc., thick, short, and straight;OLv嘉泰姆
2. FB, CSP, CSN wiring should be kept away from switch signals such as inductors, and it is recommended to use ground wires to surround them;OLv嘉泰姆
3. The positive pole of the input capacitor is close to the VIN pin of the chip, and the negative pole of the input capacitor is close to the GND pin of the chip.​​​​​​​OLv嘉泰姆

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