In the fields of electric vehicles, industrial control systems and fast charging power sources, efficient and stable DC-DC step-down solutions are essential. As a step-down power management chip with wide voltage input, CXSD62671 has become an ideal choice for industrial power supply design with ultra-wide input range of 10-115V, output capability of more than 10A and multiple protection functions.
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[ CXSD62671 ]"
CXSD62671 Broad Voltage Buck Chip: High Performance Industrial Power Solution
In the fields of electric vehicles, industrial control systems and fast charging power sources, efficient and stable DC-DC step-down solutions are essential.CXSD62671As a step-down power management chip with wide voltage input,10-115V Ultra Wide Input Range,More than 10A output capacityAnd multiple protection functions, become the ideal choice for industrial power design.
1. core features and benefits
1. Zero power shutdown technology:Controlled by EN enable pin (high level 2.8V on), standby current is as low10μASignificantly reduce battery system energy consumption.
2. Industrial wide voltage adaptation:Support10V-115V input, Compatible with electric vehicle/motorcycle 12V/48V battery system, adapt to voltage fluctuation scenarios.
3. High power output expansion:External MOS tube can be realized10A high current outputTo meet the needs of high-voltage loads such as fast charging power supplies and inverters.
4. Six heavy safety protection
a. Output short circuit hiccup protection
B. Cycle-by-cycle current limit (current limit threshold 0.18V)
c.135 ℃ over-temperature protection
d.2kV ESD protection
2. Key Design Guide
1. Flexible configuration of output voltage
Adjusted by FB pin resistor voltage division: Vout = (1R2R1) × 1.25V
ExampleWhen R1 = 10kΩ and R2 = 1kΩ, the output is exactly 13.75V with an error of 3% (feedback voltage 1.21-1.29V).
2. Key points of peripheral device selection
| Components | Selection requirements |
|---|---|
| MOS tube | Low turn-on voltage (GS≤ 4.5V), low internal resistance/junction capacitance, improve conversion efficiency |
| Inductance | According to continuous/intermittent mode selection, ripple current ≤ 30% load current: |
| Diode | Schottky diode (low drop, fast recovery) to reduce freewheeling loss |
| Capacitance | Low ESR design, ripple formula: |
3. typical application scenarios
1. Electric vehicle/motorcycle converter: Adapt to 12-72V battery fluctuations and drive on-board equipment
2. Industrial Control System: Provide stable 24V/48V power supply for PLC and sensor
3. Fast charging module: Support PD fast charging protocol above 20V/5A
4. Photovoltaic inverter: High voltage input to low voltage auxiliary power supply
Key to 4. PCB Design
1. High current path: VIN/HO line width is shortened to reduce impedance heating.
2. bootstrap capacitor: The VB-VS capacitor needs to be close to the chip pin (ESOP8 package)
3. Thermal layout: power ground (GND on the back of Pin 0) is fully covered with copper
Cost-effective advantages of the scheme: The peripheral devices are simplified and support 140kHz high frequency switching (5% accuracy), saving 20% BOM cost compared with the traditional scheme.
Five. Component Parameters and Precautions in Application Design
1 PCB layout:The bootstrap capacitor between VB and VS is as close as possible to the chip pin. The large current path trace is as wide and short as possible.
2 MOS tube selection:The MOS tube selects GS 4.5V low-open MOS tube that can be fully opened. The MOS tube selects low internal resistance and low junction capacitance, which can give
CXSD62671 pressure reducer provides good performance.
3 Output inductance
There are two working modes of the CXSD62671: continuous working mode and discontinuous working mode. The value of inductance will affect the working mode of the voltage reducer.
The CXSD62671 works in discontinuous mode under light load, and the inductance value will affect the ripple of the inductor current. The inductance can be selected according to the following formula:where Vin is the input voltage, Vout is the output voltage, Fs is the PWM operating frequency, and Iripple is the current ripple in the inductor
The peak-to-peak value of the wave is usually selected Iripple not exceed 30% of the maximum output current.
4 Freewheeling Diodes
The freewheeling diode is mainly used to provide a loop for the inductor current when the switch tube is turned off. The switching speed and forward voltage drop of this diode directly
Affects the efficiency of the DC-DC, the use of Schottky diodes has a fast switching speed and low forward conduction voltage drop, which can improve the CXSD62671 voltage reducer.
for high efficiency performance.
5 Output capacitance
The output capacitor Co is used to filter the output voltage, so that the DC-DC voltage reducer outputs a relatively stable DC current to the load, and selects
When selecting a capacitor with low ESR as much as possible, the size of the selected capacitor value is mainly determined by the ripple requirement of the output voltage, which can be determined by the following formula:where & Delta;Vo is output voltage ripple, & Delta;IL is inductor current ripple, Fs is PWM operating frequency, ESR
is the equivalent series resistance of the output capacitor.
6 Output voltage setting
The output voltage of the CXSD62671 is set by the two voltage dividing resistors on the FB pin, and the reference voltage of the internal error amplifier is 1.25V, as shown in the figure
8.5 shown in the figure, the output voltage Vout =(1 R1/R2)* 1.25V. If you need to set the output voltage to 13.75V, you can set R1 to 10K and R2 to 1K,
Output voltage Vout =(1 10/1)* 1.25V = 13.75V.
Figure 8.5 CXSD62671 output voltage regulation circuit
Conclusion
CXSD62671Industrial grade reliabilityandFlexible scalability, solves the power supply design pain point of the wide voltage input scenario. Its multiple protection mechanisms and ultra-low standby power consumption characteristics are particularly suitable for battery-powered and harsh environment applications, providing engineers with a cost-effective step-down solution.
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Product packaging diagram
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| Model | VCC starting voltage | VCC Shutdown Voltage | Input voltage range | Starting current | Switching frequency | Output voltage accuracy | Built-in power tube | Features | Encapsulation |
| CXDC65167 | 6.5V | 3.5V | 20-60V | Built-in Quick Start | 10-100K, peripheral can be set | 3% | There are | 48V battery-powered system step-down switching power supply chip | ESOP8 |
| CXAC85204 | 16V | 9V | 20-150V | 3uA | jitter frequency | 1.5% | There are | Non-isolated system constant voltage constant current output | SOP7 |
| CXAC85207 | 9.5V | 7.8V | 10-25V | 80uA | 0-300K, peripheral adjustable | 1.50% | None | programmable power chip | SOP16 |
| CXLB73135 | 9.5V | 7.8V | 10-25V | 80uA | 0-300K, peripheral adjustable | 1.50% | None | programmable power chip | SSOP24 |
| CXDC65168 | 6.5V | 3.5V | 10-600V | 200uA | 0-300K, peripheral can be set | 1.5% | None | Synchronous Rectification, HighEfficiencycan support the battery constant current constant voltage charging | SOP16 |
| CXSU63303 | - | - | 7-150V | External auxiliary power supply | 70K | 1.5% | None | The buck-boost control chip supports high-voltage and high-current protection solutions. | QFN32 |
| CXSU63304 | - | - | 13-90V | External auxiliary power supply | 100K | 1.5% | None | Buck-Boost Digital Power Chip Supporting PD3.0 Protocol | QFN64 |
| CXSU63305 | 3.65V | 3.6V | 4-600V | 50uA | 0-300K, peripheral can be set | 1.5% | None | Step-up synchronous rectification scheme to support high-voltage high-current scheme | SOP16 |
| CXSD62669 | 16V | 9V | 20-90V | 3uA | jitter frequency | 1.5% | There are | Non-isolated system constant voltage constant current output | SOP7 |
| CXSD62670 | 16V | 9V | 20-600V | 3uA | jitter frequency | 1.5% | There are | Non-isolated system constant voltage constant current output | SOP7 |
| CXSD62671 | - | - | 10-115V | Built-in Quick Start | 140KHz | 3% | None | Short circuit hiccup, flexible and adjustable output voltage | ESOP8 |
| CXSD62672 | - | - | 10-115V | Built-in Quick Start | 120KHz | 3% | None | Short circuit lock, flexible output voltage adjustable | ESOP8 |
| CXSD62673 | - | - | 10-100V | Built-in Quick Start | 120KHz | 3% | There are | Zero power consumption enable, flexible and adjustable output voltage | ESOP8 |
| CXSD62674 | - | - | 10-120V | Built-in Quick Start | 120KHz | 3% | There are | Zero power consumption enable, flexible and adjustable output voltage | ESOP8 |
| CXSD62675 | - | - | 10-120V | Built-in Quick Start | 120KHz | 3% | There are | Short circuit hiccup, flexible and adjustable output voltage | ESOP8 |
| CXSD62676 | - | - | 10-120V | Built-in Quick Start | 120KHz | 3% | None | Short circuit hiccup, flexible and adjustable output voltage | ESOP8 |
| CXSD62677 | - | - | 10-120V | Built-in Quick Start | 70KHz | 3% | None | Short circuit lock, flexible output voltage adjustable | ESOP8 |
| CXSD62678 | 4.6V | 3.8V | 4-600V | 50uA | 0-300K, peripheral can be set | 1.5% | None | Step-down synchronous rectification scheme to support high voltage and high current scheme | SOP16 |
| CXSD62679 | 16.5V | 8V | 10-600V | 200uA | 0-300K, peripheral can be set | 1.5% | None | Synchronous Rectification, HighEfficiencycan support the battery constant current constant voltage charging | SOP16 |
| CXSD62680 | 8.5V | 7.5V | 10-600V | 200uA | 0-300K, peripheral can be set | 1.5% | None | Synchronous Rectification, HighEfficiencycan support the battery constant current constant voltage charging | SOP16 |
| CXSD62681 | 9.5V | 7.8V | 11-250V | 200uA | 0-300K, peripheral can be set | 1.5% | None | Synchronous Rectification, HighEfficiency, short circuit lock, built-in temperature protection, etc. | SSOP16 |
| CXSD62682 | 9.5V | 7.8V | 11-100V | 200uA | 0-300K, peripheral can be set | 1.5% | There are | Synchronous Rectification, HighEfficiency, short circuit lock, built-in temperature protection, etc. | QFN32 |
| CXSD62683 | 9.5V | 7.8V | 11-30V | 200uA | 0-300K, peripheral can be set | 1.5% | There are | Synchronous Rectification, HighEfficiency, short circuit lock, built-in temperature protection, etc. | QFN32 |
| CXSD62684 | - | - | - | External auxiliary power supply | Maximum operating frequency 100KHz | - | None | Digital Algorithm Current Mode Synchronous Buck Control Chip | SSOP24 |
| CXSD62685 | 9.5V | 7.8V | 10-25V | 80uA | 0-300K, peripheral adjustable | 1.50% | None | Synchronous Rectifier Buck Power Supply Control Chip | SSOP16 |
