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CXSD62677:10A high current wide voltage DC-DC chip, revolutionary breakthrough in zero power turn off and delay function93h嘉泰姆
          In high-power scenarios such as fast charging for electric vehicles and industrial power supplies, balancingHigh current outputandUltra low standby power consumptionThe DC-DC solution is a must-have in the industry.CXSD62677As an upgraded wide voltage regulator chip10A continuous output capabilityTheZero power shutdown technologyandElectric lock delay functionProvide unprecedented efficient solutions for battery systems. This article will delve into its innovative features and design practices.93h嘉泰姆

1、 Core upgrade highlights

1.10A high current output93h嘉泰姆

a. External MOS transistor supportContinuous 10A+outputThe power density has been increased by 100%, meeting the requirements of fast charging for electric vehicles (48V/72V system) and high-power industrial equipment.93h嘉泰姆

b. 75kHz PWM frequency optimizes high-frequency efficiency and reduces electromagnetic interference (EMI).93h嘉泰姆

2. Zero power shutdown technology:EN< 1V standby current≤ 10μ A(Actual measured value), completely eliminating static losses in the battery system and extending battery life.93h嘉泰姆

3. Exclusive security features93h嘉泰姆

1. Short circuit locking protectionLock off in case of malfunction to avoid repeatedly restarting and damaging the device;93h嘉泰姆

2. Delay in closing the electric lockSet delay shutdown through C3/R1 (formula:t=0.53× C3× R1）To prevent misoperation and enhance security;93h嘉泰姆

3.155 ℃ temperature protection(Industry leading threshold), adapted to high-temperature industrial environments.93h嘉泰姆

2、 Key application scenarios

1. Electric/motorcycle fast charging system10A output supports 60W-120W fast charging module, compatible with lead-acid/lithium battery packs.93h嘉泰姆

2. Industrial control systemProvide stable 12V/24V power supply for servo drives and PLCs, resistant to 125V voltage surges.93h嘉泰姆

3. Intelligent electric lock systemThe delayed shutdown function prevents accidental power outages and enhances reliability.93h嘉泰姆

4. Solar inverterWide voltage input (10-120V) is suitable for photovoltaic panel fluctuations, with a conversion efficiency greater than 92%.93h嘉泰姆

3、 Design Optimization Guidelines

1. Selection of power devices:MOS transistor: RequiredVgs≤ 4.5V low turn-on voltageThe<5mΩ internal resistanceDevices such as 76N10 are recommended.93h嘉泰姆

Inductance and capacitance designInductance value calculation：93h嘉泰姆

Among them, Fs=75kHz, Imax=10A.93h嘉泰姆

2. Output capacitor: AdoptingPolymer low ESR capacitorThe ripple formula has been revised to:93h嘉泰姆

3. Delay shutdown configuration93h嘉泰姆

Example: Requires a 25 second delay→  C3=47μ F，R1=1MΩ（t=0.53×47e-6×1e6≈25s）。93h嘉泰姆

4、 Advantages compared to previous generation chips

5、 Electrical characteristics and packaging

1. Limit parametersInput voltage withstand 125V, ESD protection 2KV, operating temperature-45℃~125℃.93h嘉泰姆

2. ESOP8 packagingBottom exposed GND pad for enhanced heat dissipation, size 4.7× 6.2mm， Compatible with high-density PCB layout.93h嘉泰姆

3. Key Performance：93h嘉泰姆

6、 Scheme value and industry impact

        CXSD62677 passedZero power shutdown technologyResolve battery devices; Standby leakage; Pain points, extending the lifespan of energy storage systems by over 30%. its10A output+dual protection mechanismRedefine high reliability standards, can replace traditional module power supplies in the field of electric vehicle fast charging, and reduce BOM costs40%.93h嘉泰姆

Application design considerations and component parameters93h嘉泰姆

1   PCB board layoutThe bootstrap capacitor between VB and VS should be as close as possible to the chip pins; Connect the high current path as wide and short as possible.93h嘉泰姆
2   MOS transistor selection93h嘉泰姆
        MOS transistor selection: GS 4.5V can fully open with low turn-on; MOS transistor, MOS transistor with low internal resistance and low junction capacitance can provide CXSD62677 with; lower blood pressure93h嘉泰姆
The device provides good performance.93h嘉泰姆
3   Output inductance93h嘉泰姆
      CXSD62677   There are two working modes: continuous working mode and discontinuous working mode. The value of inductance will affect the working mode of the voltage regulator93h嘉泰姆
When under light load, CXSD62677 operates in discontinuous mode, and the inductance value will affect the ripple of the inductance current. The selection of inductance can be based on the following formula:93h嘉泰姆

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In the equation, Vin is the input voltage, Vout is the output voltage, Fs is the PWM operating frequency, and Iripple is the peak to peak value of the current ripple in the inductor,93h嘉泰姆
Usually, Iripple should not exceed 30% of the maximum output current.93h嘉泰姆
4   freewheeling diode93h嘉泰姆
        The freewheeling diode is mainly used to provide a circuit for the inductor current when the switching transistor is turned off. The switching speed and forward voltage drop of this diode are directly affected93h嘉泰姆
The efficiency of DC-DC is affected by the use of Schottky diodes, which have fast switching speed and low forward conduction voltage drop, and can improve the performance of CXSD62677 voltage regulators93h嘉泰姆
Provide high efficiency performance.93h嘉泰姆
5   output capacitor93h嘉泰姆
      Output capacitance; Co is used to filter the output voltage, so that; The DC-DC converter provides a relatively stable output of DC power to the load. Choose this option93h嘉泰姆
Choose as low a capacitance as possible; The capacitance of ESR is mainly determined by the ripple requirements of the output voltage, and can be determined by the following formula:93h嘉泰姆
In the formula, Delta; Vo is the output voltage ripple,Δ IL is inductor current ripple, Fs is; PWM operating frequency, ESR93h嘉泰姆
It is the equivalent series resistance of the output capacitor.93h嘉泰姆
6   Output voltage setting93h嘉泰姆
    The output voltage of CXSD62677 is; The two voltage divider resistors on the FB pin are set, and the reference voltage of the internal error amplifier is; 1.25V， As shown in the figure93h嘉泰姆
As shown in 8.5, the output voltage Vout=(1+R1/R2) * 1.25V. If you need to set the output voltage to 13.75V, you can set R1 to 10K and R2 to 1K,93h嘉泰姆
Output voltage Vout=(1+10/1) * 1.25V=13.75V.93h嘉泰姆

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7   Turn off delay settings93h嘉泰姆
    The shutdown delay of CXSD62677 is determined by the C3 R1 parameter value, and the time constant is approximately t=0.53 * C3 * R1; To set a 25 second shutdown delay, C3 is 47uF and R1 is 1M.93h嘉泰姆

Conclusion93h嘉泰姆
      From intelligent electric lock to industrial high-power system, CXSD62677“ Zero power consumption+safety delay;  Set a new benchmark for the industry in terms of functionality. Engineers can flexibly configure the voltage divider resistor (Vout=(1+R1/R2)× 1.25V) and delay circuit, quickly build efficient and safe wide voltage power supply solutions to meet the challenges of the new energy era.93h嘉泰姆

Innovative ApplicationsPaired with gallium nitride (GaN) MOSFETs, 100W+PD fast charging can be achieved; In AGV robots, stable conversion from 48V to 12V/10A is supported with an efficiency of over 93%.93h嘉泰姆

      For detailed PDF specifications, please contact us. You can also receive free samples and technical support！93h嘉泰姆
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   Product packaging diagram;93h嘉泰姆

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   Circuit schematic diagram;93h嘉泰姆

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   Selection Guide for Related Chips;            More related products .....93h嘉泰姆

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