Product Overview

    CXBD3547 is an intelligent power drive solution developed for the industrial control field, featuring advanced dual comparator architecture and full bridge drive design. This chip integrates multiple innovative circuit technologies, including logic signal input processing modules, intelligent SD control units, and multiple protection circuit systems, designed specifically for high reliability motor control scenarios.

   Analysis of Core Advantages nft嘉泰姆

    oneHigh voltage driving capabilitynft嘉泰姆

      Adopting a groundbreaking floating bootstrap power supply architecture, it supports working voltages up to 600V (typical VBS=600V), and is designed with a wide range of low-end power supply (10-25V VCC) to perfectly meet industrial high voltage drive requirements. Its unique level shift circuit can effectively reduce signal interference in high voltage environments.nft嘉泰姆

  2. Intelligent protection systemnft嘉泰姆

Triple composite protection mechanism: Integrated under voltage lockout (UVLO), pulse filtering, and lockout protection circuit, effectively preventing direct damage to the power transistornft嘉泰姆

Dual channel overcurrent protection: Real time monitoring of current status through internal comparator, and rapid shutdown of output at 0.5-ms in case of abnormalitynft嘉泰姆

Security protection mode: When the input is suspended, built-in 250kΩ Pull down resistor automatically shuts off power transistor to ensure system safetynft嘉泰姆

threeHigh efficiency outputnft嘉泰姆

        Equipped with 0.8A/1.3A (typical value) driving capability, adopting optimized dead time control technology, supporting up to 500kHz switching frequency. By using dynamic level shift technology, it can be perfectly compatible with 3.3V/5V logic level inputs, significantly reducing the demand for peripheral components.nft嘉泰姆

   Application scenario extension nft嘉泰姆

• New energy field: electric vehicle motor control system, photovoltaic inverter drive module
• Smart home appliances: Variable frequency air conditioning compressor drive, brushless motor control for drum washing machine
• Industrial Automation: Servo Motor Drivers, Industrial Robot Joint Drive Modules
• Audio equipment: High power Class D amplifier output stage, supporting high fidelity audio amplification

Packaging and Certification:nft嘉泰姆
Adopting a compact SSOP24 package (4.4× 8.7mm), it complies with JEDEC MO-150 standard and has passed RoHS 2.0 and halogen-free certification. The working temperature range covers -40 ℃ to+125 ℃, meeting the requirements of industrial grade applications.nft嘉泰姆

This chip performs excellently in dynamic response demanding scenarios such as variable frequency water pump control and unmanned electromechanical tuning systems by optimizing PWM response characteristics (typical rise time of 35ns) and integrating intelligent shutdown function. The streamlined design of its peripheral circuits can reduce BOM costs by about 30%, making it a cost-effective alternative to traditional discrete solutions.nft嘉泰姆

   Technical Specifications (Product PDF);nft嘉泰姆

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

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   Product packaging diagram;nft嘉泰姆

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   circuit schematic diagram nft嘉泰姆

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Application Designnft嘉泰姆

onePower supply voltage at the VCC endnft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-25Vnft嘉泰姆
The ground of CXBD3547 chip is shared with the ground of MCU.nft嘉泰姆

2. Input logic signal requirements and output driver characteristicsnft嘉泰姆
    The main functions of CXBD3547 include logic signal input processing, dead time control, level conversion function, and floating bootstrap power supplynft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 1.0Vnft嘉泰姆
Below, it is required that the output current of the logic signal be small enough to allow the MCU to directly connect the output logic signal to the input of CXBD3547nft嘉泰姆
On the channel. The maximum input of high-end upper bridge arm and low-end lower bridge arm output drivers can reach 1.3A and the maximum output current can reachnft嘉泰姆
0.8A, The high-end bridge arm channel can withstand a voltage of 600V, and the conduction delay between the input logic signal and the output control signalnft嘉泰姆
When the time is small, the low-end output has a conduction delay of 220nS when turned on and 200nS when turned off, and the high-end output has a conduction delay ofnft嘉泰姆
The conduction delay for turning off 220nS is 200nS. The rise time for turning on the low-end output is 350nS, and the fall time for turning off is 140nS,nft嘉泰姆
The rise time for high-end output activation is 350nS, and the fall time for shutdown is 140nS.nft嘉泰姆
The logic function diagram of input signal and output signal is shown in Figure 8-1:nft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” Under certain circumstances, the drivernft嘉泰姆
Control the output HO and LO to be both“ 0” Simultaneously turn off the upper and lower power transistors; When the input logic signal SD is 1, HIN isnft嘉泰姆
“ 0” ， LIN stands for '; 1” When, the HO output is“ 0” ， The LO output is“ 1”； When the input logic signal SD is 1, HINnft嘉泰姆
For“ 1” ， LIN stands for '; 0” When, the HO output is“ 1” ， The LO output is“ 0”nft嘉泰姆
3 bootstrap circuitsnft嘉泰姆
    The CXBD3547 adopts a bootstrap floating drive power supply structure, which greatly simplifies the design of the drive power supply, using only one power supply voltage VCCnft嘉泰姆
It can drive two power switching devices, high-end N-channel MOS transistor and low-end N-channel MOS transistor, bringing great benefits to practical applicationsnft嘉泰姆
The convenience. CXBD3547 can use two external bootstrap diodes as shown in Figure 8-2 and two bootstrap capacitors to automatically complete the bootstrap boostnft嘉泰姆
Function: Assuming that the VC bootstrap capacitor has been charged to sufficient voltage (Vc=VCC) during the period when the lower tube is turned on and the upper tube is turned off, when HO outputsnft嘉泰姆
When the upper tube is turned on and the lower tube is turned off at high level, the voltage on the VC bootstrap capacitor will be equivalent to a voltage source as the internal driver VBnft嘉泰姆
Drive high-end N-channel MOS transistors with VS power supply.nft嘉泰姆

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