Product Overview

CXSD62661 efficient synchronous rectifier buck converter technology analysis, as a new generation of intelligent power supply solution, CXSD62661 synchronous rectifier Buck DC-DC switching converter with itsgMK嘉泰姆
Excellent performance, bringing innovative experience to industrial control and automotive electronics. The device adopts advanced 120kHz constant frequency PWM control technology and is implemented in a wide voltage input range of 5V to 40V.gMK嘉泰姆
Up to 95% conversion efficiency, the maximum output current can reach 4A, perfect support for 30W power output demand.gMK嘉泰姆

   Product FeaturesgMK嘉泰姆

Highlights of core advantages:gMK嘉泰姆

Wide voltage adaptation: 1.25-35v accurate adjustable output, suitable for a variety of equipment needsgMK嘉泰姆
Full load efficient operation: patented synchronous rectification architecture achieves 95% + conversion efficiencygMK嘉泰姆
Commercial reliability:-40 ℃ ~ 125 ℃ wide temperature range operation, in line with Class3A ESD protection standardsgMK嘉泰姆
★ intelligent protection mechanism: Triple Protection System (overheating shutdown/dynamic current limiting/short circuit frequency reduction) to ensure equipment safetygMK嘉泰姆
• Compact design: integrated MOSFETs + equalizing circuit, TO252-5L package saves 70% PCB spacegMK嘉泰姆

Features of technological innovation:gMK嘉泰姆

• 100% Maximum duty cycle output capability to ensure low voltage difference of occupational stabilitygMK嘉泰姆
• ± 2% high-precision voltage reference to improve system control accuracygMK嘉泰姆
• Intelligent frequency switching technology (120kHz & rarr;30kHz) to deal with short circuit exceptionsgMK嘉泰姆
• Optimize thermal management design to effectively reduce system temperature risegMK嘉泰姆

   Application ScopegMK嘉泰姆

Industry Application scenarios:gMK嘉泰姆

▶New energy vehicles: on-board electronic system, BMS power managementgMK嘉泰姆
▶Industrial automation: PLC controller. Mechanical arm drive power supplygMK嘉泰姆
▶Communication Infrastructure: 5G base station equipment, optical fiber transmission modulegMK嘉泰姆
▶Intelligent IoT: edge computing terminal and remote monitoring devicegMK嘉泰姆

The converter significantly reduces BOM cost through integrated design, and its excellent linear/load adjustment rate (<1%) and multiple protection mechanisms provide reliable guarantee for equipment operation in harsh environments, it is an ideal choice for engineers to create efficient compact power system.gMK嘉泰姆

   Technical Specification (product PDF)gMK嘉泰姆

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

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   Product packaging diagramgMK嘉泰姆

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   Circuit Schematic diagramgMK嘉泰姆

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Bill of MaterialsgMK嘉泰姆

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DEMO physical picturegMK嘉泰姆

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PCB layoutgMK嘉泰姆

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Typical performance parametersgMK嘉泰姆

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      Application Information gMK嘉泰姆

Input capacitance selectiongMK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. To prevent large transient voltage, the maximumgMK嘉泰姆
The RMS current requires low ESR (equivalent series resistance) input capacitor. For most applications, a 100UF input capacitor is enough.gMK嘉泰姆
The placement position is as close as possible to the position of CXSD62661. The maximum RMS capacitor current is given by the following formula:gMK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, that is, IMAX = ILIM-△il/2. Ceramic electricity is not usedgMK嘉泰姆
For containers, it is also recommended to add a 0.1uF to 1UF ceramic capacitor to the input capacitor for high frequency decoupling.gMK嘉泰姆
Output capacitance selectiongMK嘉泰姆
At the output terminal, a low ESR Capacitor should be selected to reduce the output ripple voltage. Generally speaking, once the ESR of the capacitor is met, the capacitor is sufficient to meet the demand. AnygMK嘉泰姆
The ESR of the capacitor and its own capacity will generate a zero point for the system. The larger the ESR value, the lower the frequency range where the zero point is located, while the zero point of the ceramic capacitor is in onegMK嘉泰姆
In terms of higher frequency, it can usually be ignored, which is a better choice. However, compared with electrolytic capacitor, large capacity and high withstand voltage ceramic capacitors will have larger volume and higher cost,gMK嘉泰姆
Therefore, it is a good choice to use 0.1uF to 1UF ceramic capacitors in combination with low ESR electrolytic capacitor. The output voltage ripple is determined by the following formula:gMK嘉泰姆
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F: switching frequency, COUT: output capacitor, △il: Ripple current in inductor.gMK嘉泰姆
Inductance selectiongMK嘉泰姆
Although the inductor does not affect the working frequency, the inductance value has a direct influence on the ripple current. The ripple current △il of the inductor decreases with the increase of the inductance value,gMK嘉泰姆
And increases with the increase of VIN and VOUT. A reasonable starting point for setting ripple current is △il = 0.3 * ILIM, where ILIM is the peak switching currentgMK嘉泰姆
The limit value. In order to ensure that the ripple current is below a specified maximum value, the inductance value should be selected according to the following formula: gMK嘉泰姆
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PCB layout guidegMK嘉泰姆

1. VIN, GND, SW, VOUT and other power lines, thick, short, straight;gMK嘉泰姆
2. FB routing is far away from switching signals such as Inductance. It is recommended to use ground wire to surround it;gMK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.gMK嘉泰姆

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