In the field of high-performance power management, CXSD62683, as a breakthrough synchronous rectification step-down DC-DC chip, is becoming an ideal choice for industrial control, fast charging equipment and inverter system with its 30V/80A built-in power tube, 15A continuous output capability and QFN32 ultra-small package. This article will analyze its technical characteristics, design advantages and industry application scenarios in depth.
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[ CXSD62683 ]"
CXSD62683: high performance 80A integrated buck chip, reshaping industrial power design efficiency
In the field of high-performance power management,CXSD62683As a breakthrough synchronous rectifier buck DC-DC chip, with its30V/80A built-in power tube,15A Continuous Output CapabilityandQFN32 Ultra Small PackageIt is becoming an ideal choice for industrial control, fast charging equipment and inverter systems. This article will analyze its technical characteristics, design advantages and industry application scenarios in depth.
1. core features: the perfect balance of high integration and small size
1. Wide voltage input range10V-30V input compatibility, adapt to a variety of industrial scenarios.
2. Minimalist peripheral design：
a. Integrated 30V/80A power MOS tube to reduce external devices
B. Support synchronous rectification, efficiency increased by more than 15%
Multiple protection mechanisms：
a. Short circuit lock protection (to be restarted)
B. cycle-by-cycle current limiting 155 ℃ over-temperature protection
4. Flexible adjustable parameters：
a. Frequency adjustment (formula: Fosc(KHz)= 6150/RI(KΩ))
B. Adjustable dead time (formula: DT(nS)= 5 * RT(KΩ))
c. The output voltage is freely set (Vout =(1 R1/R2)* 1.3V)
2. Key Application Domain Analysis
1. Fast charging power supply (PD protocol):15A continuous current output capability to meet 100W fast charging requirements and support dynamic voltage adjustment.
2. Industrial control system:Wide temperature range support (-45 ℃ ~ 125 ℃), adapt to harsh environment, built-in short circuit protection to ensure equipment safety.
3. Non-isolated DC-DC module:QFN32 package saves 70% PCB area, and only inductor + capacitor is needed to construct a complete scheme on the periphery (refer to fig. 6-1~6-4).
3. Design Guide: Optimizing Energy Efficiency and Reliability
1.VCC power supply design: 10-15V input is recommended, and 78L12 regulator is required when> 18V
2. Inductor selection formula：
(Ripple current ≤ 30% maximum output is recommended)
3. Key to capacitor selection: Low ESR capacitor priority, output voltage ripple formula:
4. Selection of current limiting scheme：
a. External resistor current limit: ipeak = 0.19V/RS1 (Figure 8.6)
B. The built-in tube resists and limits the current (Figure 8.7).
Deep Interpretation of 4. Security Protection Mechanism
When the output current is abnormal, the chip is protected by the three-level protection system:
1. Cycle-by-cycle current limiting: Real-time monitoring of IS pin voltage (threshold 0.19V)
2. Short circuit locking: output voltage <75% set value trigger protection, need to restart recovery
3. Temperature protection: 155 ℃ automatic shutdown to avoid thermal runaway
5. PCB Layout Golden Rule
1. Principle of capacitor proximity: VCC/GND capacitor, VB/VS bootstrap capacitor close to pin
2. Power path design: SW1/SW2/VP trace width ≥ 2mm, shorten the loop
3. Ground separation: single-point connection between power ground (PIN14-16) and signal ground (PIN5,12)
Analysis of 6. Market Competitiveness
In contrast to traditional discrete solutions, CXSD62683 offer:
1. Cost reduced by 40% (integrated drive + power tube)
2. Power density increased by 3 times (5 × 5mm QFN32)
3. Support high frequency design (125kHz typical)
Component Parameters and Precautions in Application Design
1 VCC supply voltage:The VCC power supply voltage is recommended to be 10-15V, which can effectively and completely open the internal power tube. Input more than 18V occasions, you can add a 78L12
To the chip VCC voltage regulator.
2 Setting of switching frequency:Set the PWM switching frequency by connecting a resistor between the chip RI pin and GND. The specific frequency value can be determined by the following formula
FOSC (kHz) = 6150/RI (kΩ)
3 setting of dead time:A resistor is connected between the DT pin and GND of the chip to set the dead time. The specific dead time value can be determined by the following formula
DT (NS) = 5 *rt (kΩ)
4 PCB layout:The capacitance between VCC and GND and the bootstrap capacitance between VB and VS are as close as possible to the chip pin; The large current path of the power tube is connected as wide and short as possible.
5 Output inductance:CXSD62683 working in continuous mode, the inductance can be selected according to the following formula:where Vin is the input voltage and Vout
Is the output voltage, Fs is the PWM operating frequency, Iripple is the peak-to-peak value of the current ripple in the inductor, and usually the Iripple is selected not to exceed the maximum output power.
30% of the flow.
6 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 the output voltage ripple, & Delta;IL is the inductor current ripple, Fs is the PWM operating frequency, ESR is the equivalent series resistance of the output capacitor.
7 Output voltage setting
The output voltage of the CXSD62683 is set by the two voltage dividing resistors on the FB pin, and the reference voltage of the internal error amplifier is 1.3V, as shown in the figure
8.5 shown in the figure, the output voltage Vout =(1 R1/R2)* 1.3V. If you need to set the output voltage to 14.3V, you can set R1 to 10K and R2 to 1K,
Output voltage Vout =(1 10/1)* 1.3V = 14.3V.
8 Peak current limit setting
In the case of external current limiting resistor: the CXSD62683 peak current limit is determined by the parameter of current limiting resistor R3, and the peak current Ipeak = 0.19V/RS1.
Built-in power tube internal resistance current limiting case: CXSD62683 peak current limit is determined by the power tube internal resistance
9 Short-circuit protection function
When the output overcurrent, the output voltage is lower than the output set voltage 3/4, the chip internal detection delay, into the short-circuit protection, the output power tube
Close. The chip VCC needs to be powered on again or the EN pin needs to be triggered again to restore the output.
Conclusion:
Through the breakthrough 80A level integration and intelligent protection design, the CXSD62683 provides "high reliability and small volume" DC-DC solutions for industrial power supply, fast charging equipment and new energy system. Its flexible voltage regulation and frequency modulation capabilities, combined with complete official design guidelines (typical circuit diagrams 6-1 to 6-4), can greatly accelerate the product development cycle. With the explosion of 5G base stations and edge computing devices, this chip is expected to become a benchmark for medium and high-power power supply design.
Extended application: Suitable for emerging fields such as server auxiliary power supply, electric vehicle charging module, photovoltaic inverter auxiliary power supply.
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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 |
