Product Overview

       Analysis of the Technical Advantages of CXBD3549 Full Bridge Driver Chip9wk嘉泰姆
      CXBD3549 is a high-performance full bridge driver chip designed specifically for the industrial and consumer electronics fields, with innovative floating bootstrap power architecture support600V ultra-high voltage withstandCan cope with harsh voltage fluctuation environments. Chip integrationTwo independent comparators, support5V/3.3V dual voltage input system, cooperate500KHz high-frequency driving capabilitySignificantly improve the response speed of switching power supplies and motor control systems.

     Core functional highlights:9wk嘉泰姆

   one.Intelligent power managementThe VCC/VB dual undervoltage protection mechanism monitors the power supply status in real-time and automatically shuts off the output in case of abnormalities to ensure system safety.9wk嘉泰姆

2. Flexible driving capability: ProvideIO+/-0.3A/0.6A bipolar output currentSuitable for small and medium power motors and power modules, balancing efficiency and cost.9wk嘉泰姆

3. Multiple protection design：9wk嘉泰姆

• SD low level controlQuickly close the HO/LO output channel to achieve emergency shutdown.
• overcurrent protectionTrigger a high-level signal to automatically cut off the drive, avoiding device damage.

4. Dual package adaptation: ProvideSSOP24 (6.5× 5.6mm) and SSOP16 (4.9× 3.9mm)Two types of packaging to meet the requirements of high-density PCB layout.9wk嘉泰姆

5. Anti interference optimizationBuilt in pulse filtering circuit and 250K pull-down resistor (IN1/IN2 channels) to prevent MOS transistor from triggering incorrectly when the input is suspended, improving system stability.9wk嘉泰姆

     Deep adaptation to industry application scenarios9wk嘉泰姆

  one  New Energy and Industrial Power Systems9wk嘉泰姆

• inverter power supply600V withstand voltage characteristics suitable for photovoltaic inverters and energy storage systems, supporting high-frequency switching to reduce energy loss.
• switching power supplySimplified design of peripheral circuits (requiring only 5-8 components) significantly shortens the development cycle, and lead-free processes that comply with ROHS standards meet export requirements.

2. Electric transportation and intelligent control9wk嘉泰姆

• Electric vehicle controllerWide voltage input range (10-20V) compatible with vehicle battery fluctuations, with a locking function to eliminate the risk of motor stalling.
• Brushless motor driverIndependent comparator achieves precise PWM speed regulation and supports efficient operation of BLDC motors (efficiency>95%).

3. Smart home appliances and industrial equipment9wk嘉泰姆

• Variable frequency water pump controller0.3A low current output mode reduces standby power consumption and adapts to humid environments with operating temperatures ranging from -40 ℃ to 125 ℃.
• Automated equipmentSSOP16 micro package is suitable for IoT devices with limited space, such as floor cleaning robots and intelligent security systems.

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Engineer design suggestions：9wk嘉泰姆

• It is recommended to pair low ESR ceramic capacitors with high-frequency application scenarios to optimize the charging and discharging efficiency of bootstrap capacitors.
• In the brushless motor drive scheme, it is recommended to connect IN1/IN2 channels in series with a 10K resistor to enhance EMI resistance.

Supported by UL/IEC certified isolation design and development kits, CXBD3549 can be quickly integrated into product lines such as industrial frequency converters and smart home appliances, helping enterprises seize the opportunity for high-performance power supplies9wk嘉泰姆
Advantage in the motor control market.9wk嘉泰姆

Technical Specifications (Product PDF);9wk嘉泰姆

      For detailed PDF specifications, please scan WeChat to contact us. You can also receive free samples and technical support！9wk嘉泰姆

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   Product packaging diagram 9wk嘉泰姆

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   circuit schematic diagram 9wk嘉泰姆

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Application Design;9wk嘉泰姆

oneVCC terminal power supply voltage 9wk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;9wk嘉泰姆
The ground of CXBD3549 chip is shared with the ground of MCU.9wk嘉泰姆
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2 Input logic signal requirements and output driver characteristics 9wk嘉泰姆
    The main functions of CXBD3549 include logic signal input processing, dead time control, level conversion function, and floating bootstrap power supply9wk嘉泰姆
Structure and totem pole output of upper and lower bridges. The high-level threshold of the logic signal input terminal is above 2.5V, and the low-level threshold is 1.0V9wk嘉泰姆
Below, it is required that the output current of the logic signal be small enough to enable the MCU to directly connect the output logic signal to the input of CXBD35499wk嘉泰姆
On the road.9wk嘉泰姆
    The maximum input and maximum output current of the high-end upper bridge arm and low-end lower bridge arm output drivers can reach 0.6A and 0.3A, respectively9wk嘉泰姆
The bridge arm channel on the end can withstand a voltage of 600V, and the conduction delay between the input logic signal and the output control signal is small,9wk嘉泰姆
The low-end output has a conduction delay of 700nS when turned on and 170nS when turned off, while the high-end output has a conduction delay of 700nS when turned on9wk嘉泰姆
The conduction delay for turning off is 170nS. The rise time for turning on the low-end output is 70nS, and the fall time for turning off is 35nS. The high-end output has a rise time of 70nS9wk嘉泰姆
The rise time for turning on the output is 70nS, and the fall time for turning off is 35nS.9wk嘉泰姆
          The logic function diagram of input signal and output signal is shown in Figure 8-1:9wk嘉泰姆

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From the truth table, it can be seen that when the input logic signal SD is 0, regardless of whether HIN and LIN are“ 1” Or "; 0” in the case of9wk嘉泰姆
The driver controls the outputs HO and LO to be both“ 0” Simultaneously turn off the upper and lower power transistors; When the input logic signal SD9wk嘉泰姆
When it is 1, HIN is“ 0” ， LIN stands for '; 1” When, the HO output is“ 0” ， The LO output is“ 1”； When input9wk嘉泰姆
When the logic signal SD is 1, HIN is“ 1” , LIN stands for '; 0” When, the HO output is“ 1” ， The LO output is“ 0”。9wk嘉泰姆
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3 bootstrap circuits 9wk嘉泰姆
    The CXBD3549 adopts a bootstrap floating drive power supply structure, greatly simplifying the design of the drive power supply, using only one power supply9wk嘉泰姆
Voltage VCC can complete the driving of two power switching devices, the high-end N-channel MOS transistor and the low-end N-channel MOS transistor9wk嘉泰姆
Practical applications bring great convenience. CXBD3549 can use two external bootstrap diodes as shown in Figure 8-2 and two9wk嘉泰姆
The bootstrap capacitor automatically completes the bootstrap boost function, assuming that the VC bootstrap capacitor has been charged during the period when the lower tube is turned on and the upper tube is turned off9wk嘉泰姆
When the voltage reaches a sufficient level (Vc=VCC), when the HO output is high and the upper tube is turned on and the lower tube is turned off, VC will bootstrap9wk嘉泰姆
The voltage on the capacitor will be equivalent to a voltage source as the power supply for the internal drivers VB and VS, completing the high-end N-channel MOS9wk嘉泰姆
Drive the tube.9wk嘉泰姆

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