Product Overview

Analysis and Innovative Advantages of CXBD3550 Full Bridge Driver Chip Technology

      CXBD3550 is a full bridge driver chip optimized for high reliability industrial scenarios, usingSuspended bootstrap power supply architectureimplement600V ultra-high voltage withstandPerformance, compatible with 5V/3.3V dual voltage input system, supports500KHz high-frequency switchSignificantly improve power conversion efficiency. itsDual channel independent control logic(HIN/LIN high level effective) can accurately drive high-end HO and low-end LO outputs, combined with0.6A/1.0A bipolar current output capabilityProvide high-performance solutions for motor drive and power supply systems.

   Detailed explanation of core technical characteristics bAt嘉泰姆

   oneHigh voltage drive and intelligent protectionbAt嘉泰姆

600V withstand voltage designBreakthrough support for industrial grade high-voltage application scenarios, such as photovoltaic inverters and industrial frequency converters.bAt嘉泰姆

VCC/VB dual undervoltage protectionReal time monitoring of low-end voltage within a wide range of 10V-25V, automatically cutting off output in case of abnormalities to prevent system damage.bAt嘉泰姆

2. Precise control and efficient outputbAt嘉泰姆

3. System integration optimizationbAt嘉泰姆

4. Environmental protection and reliability assurancebAt嘉泰姆

   Deep adaptation solution for industry application scenarios bAt嘉泰姆

   oneNew Energy and Industrial Power SystemsbAt嘉泰姆

inverter power supply600V withstand voltage suitable for three-phase inverter topology, 500KHz high-frequency switching reduces inductance volume and improves power density.bAt嘉泰姆

switching power supplyOptimization of small and medium power DC-DC modules with 0.6A driving current, coupled with adaptive dead zone control, improves efficiency to over 93%.bAt嘉泰姆

2. Electric transportation and intelligent devicesbAt嘉泰姆

3. Smart home appliances and industrial automationbAt嘉泰姆

Performance parameter comparison and selection guidebAt嘉泰姆

        Engineer design suggestion:bAt嘉泰姆

• High frequency application optimizationIt is recommended to use 1μ F/50V low ESR ceramic capacitors for bootstrap capacitors to shorten the charging cycle.bAt嘉泰姆

• EMI suppression schemeSeries connection of HIN/LIN signal lines with 22Ω Connect a 100pF capacitor in parallel with a resistor to reduce high-frequency noise interference.bAt嘉泰姆

• Thermal management designUnder continuous full load conditions, it is recommended to increase the copper thickness of the PCB by 2oz and reserve heat dissipation pads.bAt嘉泰姆

      CXBD3550 has become the preferred driving solution in the fields of industrial power supply, electric transportation, and smart home appliances due to its high voltage tolerance, high integration, and flexible control characteristics. Provide complete reference designs and EMC testing reports to help customers quickly pass CE/UL certification and seize the opportunity in the high-performance motor control market.bAt嘉泰姆

 Technical Specifications (Product PDF);bAt嘉泰姆

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

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   Product packaging diagram bAt嘉泰姆

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   circuit schematic diagram bAt嘉泰姆

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Application Design bAt嘉泰姆

oneVCC terminal power supply voltage bAt嘉泰姆
   Considering sufficient driving voltage to drive N-channel power MOS transistors, it is recommended that the typical operating voltage of the power supply VCC be 10V-20V;bAt嘉泰姆
The ground of CXBD3550 chip is shared with the ground of MCU.bAt嘉泰姆
2 Input logic signal requirements and output driver characteristics;bAt嘉泰姆
   The main functions of CXBD3550 include logic signal input processing, dead time control, level conversion function, floating bootstrap power structure, and upper and lower bridgesbAt嘉泰姆
Totem pillar output. The high-level threshold of the logic signal input terminal is above 2.5V, and the low-level threshold is below 1.0V, requiring the input of logic signalsbAt嘉泰姆
The output current is small, which allows the MCU output logic signal to be directly connected to the input channel of CXBD3550.bAt嘉泰姆
    The maximum input and output current of the high-end upper bridge arm and low-end lower bridge arm output drivers can reach 1.0A and 0.6A, respectivelybAt嘉泰姆
The channel can withstand a voltage of 600V, and the conduction delay between the input logic signal and the output control signal is small. The conduction delay when the low-end output is turned on isbAt嘉泰姆
220nS、 The turn off conduction delay is 200nS, the high-end output turn-on conduction delay is 220nS, and the turn off conduction delay is 200nS. The low-end output turn-onbAt嘉泰姆
The rise time is 350nS and the fall time when turned off is 140nS. The rise time when the high-end output is turned on is 350nS and the fall time when turned off isbAt嘉泰姆
140nS. The logic function diagram of input and output signals is shown in Figure 8-1:bAt嘉泰姆
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According to the truth table, when the input logic signals HIN1,2 are“ 1” And LIN1,2 is“ 0” When the driver controls the output HO1,2 to be“ 1”bAt嘉泰姆
Open the upper tube, LO1, 2 for“ 0” Turn off the lower pipe; When the input logic signals HIN1,2 are“ 0” And LIN1,2 is“ 1” When driving controlbAt嘉泰姆
Output HO1,2 as“ 0” Turn off the upper pipe, LO1, 2 for“ 1” Open the lower tube; When the input logic signals HIN1,2 and LIN1,2 are both“ 1” When,bAt嘉泰姆
The driver controls the outputs HO1,2 and LO1,2 to be“ 0” Turn off both the upper and lower power transistors simultaneously. HIN1, 2 and LIN1,2 are both“ 0” When drivingbAt嘉泰姆
The controller outputs HO1,2 and LO1,2 as“ 0” Turn off both the upper and lower power transistors simultaneously.bAt嘉泰姆

3 bootstrap circuits;bAt嘉泰姆

      The CXBD3550 adopts a bootstrap floating drive power supply structure, greatly simplifying the design of the drive power supply. With only one power supply voltage VCC, it can achieve high-end performancebAt嘉泰姆
The driving of two power switching devices, N-channel MOS transistor and low-end N-channel MOS transistor, brings great convenience to practical applications. CXBD3550 canbAt嘉泰姆
Use two external bootstrap diodes as shown in Figure 8-2 and two bootstrap capacitors to automatically complete the bootstrap boost function, assuming that during the period when the lower tube is turned on and the upper tube is turned offbAt嘉泰姆
The VC bootstrap capacitor has been charged to a sufficient voltage (Vc=VCC). When the HO output is at a high level and the upper tube is turned on and the lower tube is turned off, the voltage on the VC bootstrap capacitor isbAt嘉泰姆
The voltage will be equivalent to a voltage source as the power supply for internal drivers VB and VS, completing the driving of high-end N-channel MOS transistors.bAt嘉泰姆

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