Product Overview

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CXSD62666 is a high-performance synchronous step-down DC-DC converter for industrial and automotive electronics. It adopts a 120kHz fixed frequency control architecture, supports 5-45V ultra-wide input voltage, and can output 1.25-40v Precision voltage, the maximum continuous current is 4A, the output power reaches 50W, and the efficiency exceeds 96%. Integrated constant voltage (CV) and constant current (CC) Dual loop control, built-in full compensation module, reduce the number of peripheral components by 30%, significantly reduce the system cost and save 60% PCB space, adapt to the design requirements of high-density power supply.

   Product FeaturesReturn to TOPqiS嘉泰姆

Highlights of core technologies

■ high-performance power managementqiS嘉泰姆

• 120kHz fixed switching frequency, automatic frequency reduction to 30kHz protection during short circuit
• Dual mode control: constant voltage/constant current adaptive switching, feedback accuracy ± 2%
• Built-in synchronous rectifier MOSFETs, supporting 100% duty cycle continuous output

■ multiple industrial protectionqiS嘉泰姆

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

■ industrial and automotive reliabilityqiS嘉泰姆

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

   Application ScopeReturn to TOPqiS嘉泰姆

✔Automotive Electronics: vehicle navigation system, ADAS module, BMS power supplyqiS嘉泰姆
✔Industrial control: PLC controller, industrial robot, motor driveqiS嘉泰姆
✔Communication equipment: 5G base station, optical fiber communication module, POE switchqiS嘉泰姆
✔IoT: edge computing node, high power sensor networkqiS嘉泰姆

   Technical Specification (product PDF)Return to TOP qiS嘉泰姆

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

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   Product packaging diagramReturn to TOPqiS嘉泰姆

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   Circuit Schematic diagramReturn to TOPqiS嘉泰姆

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Bill of MaterialsqiS嘉泰姆
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DEMO physical pictureqiS嘉泰姆
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PCB layoutqiS嘉泰姆
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Typical performance parametersqiS嘉泰姆
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Application InformationqiS嘉泰姆
Input capacitance selectionqiS嘉泰姆
In continuous mode, the input current of the converter is a set of square waves with a duty cycle of about VOUT/VIN.qiS嘉泰姆
To prevent large transient voltage, low ESR must be selected for maximum RMS current requirements.qiS嘉泰姆
(Equivalent series resistance) input capacitor. For most applications, 1 220UF inputqiS嘉泰姆
The capacitor is enough, and its placement position is as close as possible to the position of CXSD62666. MostqiS嘉泰姆
The current of the large RMS capacitor is given by the following formula:qiS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 peak ripple current,qiS嘉泰姆
That is, IMAX = ILIM-△il/2. When no ceramic capacitor is used, it is also recommended to increase the input capacitor.qiS嘉泰姆
Add a 0.1uF to 1UF ceramic capacitor for high frequency decoupling.qiS嘉泰姆
Output capacitance selectionqiS嘉泰姆
Low ESR capacitance should be selected at the output to reduce the output ripple voltage. Generally speaking, once the capacitanceqiS嘉泰姆
If the ESR is satisfied, the capacitance is enough to meet the demand. The ESR of any capacitor together with its own capacityqiS嘉泰姆
A zero point will be generated for the system. The larger the ESR value, the lower the frequency range where the zero point is located, while ceramic electricityqiS嘉泰姆
The zero point of the capacity is at a higher frequency, which can be usually ignored. It is a better choice,qiS嘉泰姆
Compared with electrolytic capacitor, large-capacity and high-voltage ceramic capacitors have larger volume and higher cost, soqiS嘉泰姆
It is a good choice to use ceramic capacitors from 0.1uF to 1UF in combination with low ESR electrolytic capacitor.qiS嘉泰姆
The output voltage ripple is determined by the following formula:qiS嘉泰姆

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F: switching frequency, COUT: output capacitor, △il: Ripple current in inductor.qiS嘉泰姆
Inductance selectionqiS嘉泰姆
Although the inductor does not affect the operating frequency, the inductor value has a direct influence on the ripple current,qiS嘉泰姆
Inductor ripple current △il decreases with the increase of inductance value, and increases with the increase of VIN and VOUTqiS嘉泰姆
Increase. A reasonable starting point for setting ripple current is △il = 0.3 * ILIM, where ILIMqiS嘉泰姆
The peak switching current limit. In order to ensure that the ripple current is below a specified maximum valueqiS嘉泰姆
Select the inductance value as follows:qiS嘉泰姆

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PCB layout guideqiS嘉泰姆
1. VIN, GND, SW, VOUT and other power lines, thick, short, straight;qiS嘉泰姆
2. FB, CSP, and CSN are routed far away from switching signals such as Inductance. We recommend that you use ground wire to surround them;qiS嘉泰姆
3. The positive electrode of the input capacitor is close to the VIN pin of the chip, and the negative electrode of the input capacitor is close to the GND pin of the chip.qiS嘉泰姆

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