Product overview

Technical Analysis of CXBD3548 Full-bridge Driver Chip0HU嘉泰姆

As the core component of industrial power drive solutions, the CXBD3548 adopts an innovative suspended bootstrap power architecture to achieve a breakthrough 600V high voltage tolerance capability. The chip integrates dual high-speed comparator module, supports 5V/3.3V dual voltage input system, and can maintain stable output characteristics under 500KHz high frequency working environment. Its intelligent power management system includes VCC/VB dual under-voltage protection mechanism, which automatically cuts off the output when abnormal voltage is detected to ensure the safe operation of the equipment.0HU嘉泰姆

In terms of technical parameters, the CXBD3548 exhibits excellent drive performance, providing 0.6A/-1.0A bipolar output current capability, and with innovative pulse filtering technology, it can effectively suppress electromagnetic interference. Through the SD port low level control, the HO/LO dual channel synchronous shutdown can be realized, and the dual safety protection system is formed by combining the overcurrent protection function. The optimized circuit design greatly reduces the demand for peripheral components. SSOP24 package meets ROHS environmental protection standard of lead-free and halogen-free while maintaining a compact layout (6.5 × 5.6mm).0HU嘉泰姆

   Innovative features highlights include: 0HU嘉泰姆

In the field of industrial automation, the chip's high-voltage drive characteristics make it an ideal choice for inverter power systems, especially for solar inverters and UPS uninterruptible power supplies. In view of the complex working conditions of electric vehicles, its wide voltage input range (10-20V) and -40 ℃ ~ 125 ℃ working temperature ensure the reliable operation of the electric vehicle controller. In mechatronics equipment, combined with the built-in 250K pull-down resistor design, it can effectively prevent the brushless motor driver from malfunctioning when the signal is abnormal.0HU嘉泰姆

   Innovative features highlights include: 0HU嘉泰姆

1. Intelligent locking technology: through the unique logic control circuit, completely eliminate the risk of upper and lower bridge arm straight through0HU嘉泰姆

2. Dynamic response optimization: built-in pulse edge processing circuit can shorten the transmission delay to 80ns level0HU嘉泰姆

3. Energy efficiency management system: standby power consumption <0.1mA, conversion efficiency of more than 97% in working mode0HU嘉泰姆

4. Anti-interference design: 6kV ESD protection level, in line with IEC61000-4-2 industrial electromagnetic compatibility standards0HU嘉泰姆

The solution has been successfully applied to many fields such as intelligent home appliance frequency conversion control, industrial servo system, new energy charging pile, etc. The isolation design through UL certification provides safety guarantee for high-voltage applications. Engineers can quickly verify solutions through the supporting development kit, significantly shortening the product development cycle.0HU嘉泰姆

   Technical Specification (Product PDF)0HU嘉泰姆

If you need detailed PDF specifications, please scan WeChat and contact us. You can also get free samples and technical support.!0HU嘉泰姆

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   Product packaging diagram0HU嘉泰姆

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   Circuit schematic 0HU嘉泰姆

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Application Design0HU嘉泰姆

1 VCC terminal supply voltage0HU嘉泰姆

Considering that there is enough driving voltage to drive the N-channel power MOS tube, the typical value of the recommended power supply VCC working voltage is0HU嘉泰姆
10V-20V; The ground of the CXBD3548 chip is shared with the ground of the MCU.0HU嘉泰姆

2 Input logic signal requirements and output driver characteristics 0HU嘉泰姆

The main functions of the CXBD3548 are logic signal input processing, dead time control, level conversion function, floating bootstrap power supply.0HU嘉泰姆

structure and upper and lower bridge totem column type output. The high level threshold of the logic signal input is above 2.5V, and the low level threshold is 1.0V.0HU嘉泰姆
The output current of the logic signal is required to be small, so that the MCU output logic signal can be directly connected to the input channel of the CXBD3548.0HU嘉泰姆

The maximum input of the output driver of the high-end upper bridge arm and the low-end lower bridge arm can reach 1.0A and the maximum output current can reach 0.6A, high0HU嘉泰姆

The bridge arm channel on the end can withstand a voltage of 600V, the conduction delay between the input logic signal and the output control signal is small, and the low end0HU嘉泰姆
Output turn-on conduction delay is 220nS, turn-off conduction delay is 200nS, high-end output turn-on conduction delay is 220nS, turn-off0HU嘉泰姆
The conduction delay is 200nS. The rise time of the low-end output is 350nS, the fall time of the shutdown is 140nS, and the high-end output0HU嘉泰姆
The rise time on is 350nS and the fall time off is 140nS.0HU嘉泰姆

The logic function diagram of input signal and output signal is shown in Figure 8-1:0HU嘉泰姆

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It can be seen from the truth table that when the input logic signal SD is 0, regardless of whether HIN and LIN are "1" or "0", the driver0HU嘉泰姆
The control outputs HO and LO are "0" at the same time, and the upper and lower power tubes are turned off at the same time. When the input logic signal SD is 1, HIN is0HU嘉泰姆
When "0" and LIN is "1", HO output is "0" and LO output is "1"; When the input logic signal SD is 1, HIN is0HU嘉泰姆
"1", when LIN is "0", HO output is "1", LO output is "0".0HU嘉泰姆
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3 bootstrap circuit0HU嘉泰姆

The CXBD3548 adopts the bootstrap suspension drive power supply structure, which greatly simplifies the design of the drive power supply and uses only one power supply voltage VCC.0HU嘉泰姆

It can complete the driving of two power switching devices, the high-end N-channel MOS tube and the low-end N-channel MOS tube, which brings great benefits to practical applications.0HU嘉泰姆
of convenience. CXBD3548 can use two external bootstrap diodes as shown in Figure 8-2 and two bootstrap capacitors to automatically complete the bootstrap boost0HU嘉泰姆
Function, assuming that the VC bootstrap capacitor has been charged to sufficient voltage (Vc = VCC) during the opening of the lower tube and the closing of the upper tube, when HO output0HU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 VB.0HU嘉泰姆
And VS power supply, complete the high-end N-channel MOS tube drive.0HU嘉泰姆

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