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CXSU63305: Industrial grade high-voltage boost DC-DC power management chip

CXSU63305 is a product designed specifically forHigh voltage and high current scenariosDesigned synchronous rectification boost DC-DC chip, supporting4-20V wide voltage inputand600V ultra-high output voltageIts innovative architecture integrates half bridge drive and intelligent protection functions, and is widely used in high reliability fields such as electric bicycle converters and industrial control systems.odD嘉泰姆

Core performance breakthrough

1. High voltage output capabilityodD嘉泰姆

a. Support600V ultra-high output voltage(VB pin withstand voltage)odD嘉泰姆

b. 4-20V wide input range (VCC pin), suitable for battery/industrial power supplyodD嘉泰姆

c. External single capacitor frequency modulation(CP pin): Frequency range 0-300kHz (formula: f=18×); 10⁶/Cp）odD嘉泰姆

2. Intelligent control featuresodD嘉泰姆

a. Dual mode enable control：odD嘉泰姆

b. Weekly flow restriction protection：odD嘉泰姆

3. High integration designodD嘉泰姆

a. Built in3.3V reference source(REF3.3V pin, 50mA driving capability)odD嘉泰姆

b. SOP16 Compact Package (10.0× 6.3mm)odD嘉泰姆

c. Soft start (SS pin)/emergency shutdown (SD pin) dual safety mechanismodD嘉泰姆

Key Application Design Guidelines

Key points of circuit designodD嘉泰姆

1. Frequency setting(CP pin):odD嘉泰姆

Using 270pF capacitor→ 67kHz typical frequency (Δ f/Δ Vcc≤± 5%)odD嘉泰姆

2. Output voltage configuration(FB pin):odD嘉泰姆

Example: R1=200kΩ , R2=10kΩ → 25.2V outputodD嘉泰姆

3. Inductance selection(Continuous/Discontinuous Mode):odD嘉泰姆

Suggested ripple current: 30% I ₒᵤₜₘₐₓodD嘉泰姆

PCB layout specificationsodD嘉泰姆

Performance advantages in industrial scenarios

▶Deep optimization of protection mechanismodD嘉泰姆

1. Short circuit responseReal time monitoring with SDHIN/SDLIN dual comparator (180mV threshold)odD嘉泰姆

2. Overheating protectionOperating at 125 ℃ ambient temperature limitodD嘉泰姆

3. Under voltage locking: VCC on/off threshold 3.65V/3.6V (± 2% accuracy)odD嘉泰姆

Design warningVB-VS pressure difference>20V may damage the chip! It is recommended to use SiC MOS transistors in high-voltage scenarios to reduce internal resistance.odD嘉泰姆

 Application Design Circuit Component Parameter SelectionodD嘉泰姆

1   REF3.3V input capacitorodD嘉泰姆

      Placing a high-frequency small capacitance bypass capacitor to ground at the REF3.3V pin will reduce high-frequency noise at the REF3.3V terminal. The high-frequency bypass capacitor is optionalodD嘉泰姆
Use a 0.1uF ceramic capacitor and place the PCB as close as possible to the chip pin REF3.3V input terminal.odD嘉泰姆

2   VCC energy storage capacitorodD嘉泰姆

      CXSU63305 requires placing a 10uF surface mount ceramic capacitor or a 0.1uF ceramic capacitor in parallel with a 10uF electrolytic capacitor at the VCC pin end to ground, and placing the PCB board as close as possible to the chip pins.odD嘉泰姆

3   Start off voltageodD嘉泰姆

      2-pin external resistor can adjust the startup voltage and shutdown voltageodD嘉泰姆
Starting voltage calculation formula: 1.2V x (R20+R21)/R21+18uA * R20odD嘉泰姆
Calculation formula for closing voltage: 1.2V x (R20+R21)/R21odD嘉泰姆

4   Calculation of Switching Frequency of Cp Capacitor in OscillatorodD嘉泰姆

      CXSU63305   Only one external capacitor is needed to set the PWM operating frequency, and a constant current source is used internally to charge and discharge the Cp capacitor as shown in Figure 8.4a,odD嘉泰姆
The constant current source for injecting current provides approximately 36uA of current internally to charge the Cp capacitor, while the constant current source for pulling current provides approximately 720uA of current internallyodD嘉泰姆
The current discharges the CT capacitor, and the approximate relationship between the operating frequency and capacitance is given by the formula f=(18 x10^six）/Cp is determined (the capacitance unit of this formula is pF), for example, a capacitance of Cp=270pF corresponds to a PWM operating frequency of approximately 67KHz.odD嘉泰姆
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5   Output peak current limitodD嘉泰姆

      CXSU63305   The peak current limit of the high-end output of the chip is determined by the internal resistance of the high-end MOS transistor, and the relationship between peak current and IPK is 180mV/odD嘉泰姆
(High end MOS tube internal resistance); The peak current limit of the low-end output of the chip is determined by the series resistance R7 of the low-end MOS transistor, and the relationship between the peak current and R7 is givenodD嘉泰姆
It is IPK=180mV/R7.odD嘉泰姆
Low end current limit value after harmonic compensation:odD嘉泰姆
IPK=（180mV-2*R6/(R6+R24)）/R7odD嘉泰姆

6   Output inductanceodD嘉泰姆

      CXSU63305   There are two working modes: continuous working mode and discontinuous working mode. The value of the inductance will affect the working mode of the boosterodD嘉泰姆
When under light load, CXSU63305 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:odD嘉泰姆
In the equation, Vin is the input voltage, Vout is the output voltage, and Vdiode is the conduction of the synchronous rectification MOS transistorodD嘉泰姆
Voltage difference, Fs is the PWM operating frequency, and Iripple is the peak to peak value of current ripple in the inductor. Typically, Iripple is selected to not exceed 30% of the maximum output current.odD嘉泰姆

7   Synchronous rectification MOS transistorodD嘉泰姆

      Adopting synchronous rectification MOSFET; Replacing traditional asynchronous converters with freewheeling diodes greatly improves power conversion efficiency; synchronous rectificationodD嘉泰姆
MOSFET selection with low internal resistance and low junction capacitance can provide good performance for CXSU63305 booster.odD嘉泰姆

8   output capacitorodD嘉泰姆
      The output capacitor Co is used to filter the output voltage, so that the DC-DC booster outputs a relatively stable DC power to the loadodD嘉泰姆
When selecting capacitors, try to choose capacitors with low ESR as much as possible. The size of the selected capacitor value is mainly determined by the ripple requirements of the output voltage, which can be determined by the following formula:odD嘉泰姆
In the formula, Delta; Vo is the output voltage ripple,Δ IL is the inductor current ripple, Fs is the PWM operating frequency, and ESR is the output currentodD嘉泰姆
Equivalent series resistance of capacitance.odD嘉泰姆
9     Output voltage regulation settingodD嘉泰姆
      The output voltage of CXSU63305 is set by two voltage divider resistors on the FB pin, and the reference voltage of the internal error amplifier is 1.2V, as shown in Figure 8.10aodD嘉泰姆
As shown, the output voltage Vout=(1+R1/R2) * 1.2V. If you need to set the output voltage to 25.2V, you can set R1 to 200K and R2 to 10KodD嘉泰姆
Output voltage Vout=(1+200/10) * 1.2V=25.2V.odD嘉泰姆

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Summary:CXSU63305 passedSingle capacitor frequency modulation, dual path current limiting, and 600V withstand voltageThree major technological breakthroughs provide cost-effective solutions for high-voltage boost conversion, significantly reducing system complexity and BOM costs. Its synchronous rectification architecture improves efficiency by 8% -12% compared to traditional diode solutions, making it an ideal choice for industrial power supply design.odD嘉泰姆

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

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   circuit schematic diagram odD嘉泰姆

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   Selection Guide for Related Chips                  More similar products .....odD嘉泰姆

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