Efficient and stable DC-DC voltage reduction solutions are the core requirements in the fields of industrial power supplies, electric vehicle systems, and fast charging equipment. CXSD62676, as a step-down power management chip with wide voltage input, is an ideal choice for cost-effective design due to its ultra wide input range of 10V-120V, output capability of over 5A, and multiple protection functions. This article will delve into its characteristics, application design points, and industry solutions.
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[ CXSD62676 ]"
CXSD62676: Comprehensive Analysis of High Performance Wide Voltage Input DC-DC Voltage Reduction Chip
Efficient and stable DC-DC voltage reduction solutions are the core requirements in the fields of industrial power supplies, electric vehicle systems, and fast charging equipment.CXSD62676As a step-down power management chip with wide voltage input, it relies on10V-120V ultra wide input rangeTheOutput capability of 5A or aboveAnd with multiple protection functions, it becomes an ideal choice for cost-effective design. This article will delve into its characteristics, application design points, and industry solutions.
1、 Core Features and Advantages
1. Wide voltage input and flexible output
a. Input voltage coverage10V to 120VSuitable for scenarios such as lead-acid batteries, electric vehicle power supplies (48V/72V), and industrial buses (24V/48V).
b. The output voltage can be flexibly adjusted through external resistor division, formula:Vout = (1 + R1/R2) × 1.25V(FB pin reference voltage 1.25V).
2. High power output and efficiency
a. External MOS transistor supportContinuous 5A+output currentMeet the demand for high-power equipment.
b. Integration120kHz PWM oscillatorOptimize conversion efficiency and reduce peripheral components.
3. Multiple protection mechanisms
a. Short circuit hiccup protectionAutomatic restart to avoid permanent damage;
b. Temperature protection(Triggered at 145 ℃) andCycle by cycle current limiting(IS pin voltage limit 0.18V);
c. Input voltage withstand up to 125V, ESD protection 2KV (HBM mode).
4. Low power designStatic current only2mA(Typical value), standby current≤200μ AExtend the lifespan of the battery system.
2、 Typical application scenarios
1. Electric vehicle/motorcycle converterCompatible with 12V/24V/48V battery systems and supports high current output.
2. Fast charging power supplyWide voltage input compatible with multi protocol charger, paired with PD protocol chip to achieve efficient and fast charging.
3. Industrial control systemProvide stable power supply for PLC and sensors, with strong anti-interference ability.
4. Instrument power supply and inverterNon isolated design simplifies layout, reducing costs by over 30%.
3、 Key Design Guidelines
1. MOS transistor selection: Need to chooseLow turn-on voltage (Vgs≤ 4.5V)TheLow internal resistanceandLow junction capacitanceMOS transistors are used to improve conversion efficiency and response speed.
2. Inductance and capacitance design
a. Inductance value formula：
Among them, Delta; IL does not exceed 30% of the output current, Fs=120kHz。
b. Output capacitor: Priority selectionLow ESR capacitanceRipple formula:
3. PCB layout optimizationBootstrap capacitor (VB-VS)Close to the chip pins, high current pathShort and wideReduce parasitic inductance.
4. freewheeling diode: SelectionSchottky diodeUtilize its low voltage drop and fast switching characteristics to improve efficiency.
4、 Electrical characteristics and packaging
1. Working temperature-45 ℃ to 125 ℃, suitable for harsh industrial environments.
2. Packaging form：ESOP8(with exposed GND pads), compact size (4.7× 6.2mm), conducive to heat dissipation design.
3. Key parameters：
| parameter | minimum | typical value | maximum | unit |
|---|---|---|---|---|
| input voltage | ten | - | one hundred and twenty | V |
| Enable high level | two point eight | - | seven | V |
| Feedback voltage | one point two one | one point two five | one point two nine | V |
5、 Cost effectiveness advantage of the solution
CXSD62676 passedHighly integrated design(Built in error amplifier, oscillator, protection circuit) significantly reduces peripheral components and BOM costsMore than 20%. ItsWide compression compatibilityandMultiple protection mechanismsSignificantly improving system reliability, especially suitable for battery powered scenarios, it has become a benchmark product for replacing traditional power solutions.
6、 Application design considerations and component parameters
1 PCB board layout:The bootstrap capacitor between VB and VS should be as close as possible to the chip pins; Connect the high current path as wide and short as possible.
2 MOS transistor selection
MOS transistor selection: GS 4.5V can fully open with low turn-on; MOS transistor, MOS transistor with low internal resistance and low junction capacitance can provide CXSD62676 with; lower blood pressure
The device provides good performance.
3 Output inductance
CXSD62676 has two working modes: continuous working mode and discontinuous working mode. The value of the inductance will affect the working mode of the voltage regulator
When under light load, CXSD62676 operates in discontinuous mode, and the inductance value will affect the ripple of the inductance current. The selection of inductance can be based on the following formula:;
In the formula, Vin is the input voltage, Vout is the output voltage, Fs is the PWM operating frequency, and Iripple is the peak to peak value of the current ripple in the inductor, which is usually selected
Iripple shall not exceed 30% of the maximum output current.
4 freewheeling diode
The freewheeling diode is mainly used to provide a circuit for the inductor current when the switching transistor is turned off. The switching speed and forward voltage drop of this diode are directly affected
The efficiency of DC-DC is affected by the use of Schottky diodes, which have fast switching speed and low forward conduction voltage drop, and can improve the performance of CXSD62676 voltage regulators
Provide high efficiency performance.
5 output capacitor
The output capacitor Co is used to filter the output voltage, so that the DC-DC converter outputs a relatively stable DC power to the load
When selecting capacitors, try to choose capacitors with low ESR as much as possible. The size of the selected capacitor value is mainly determined by the ripple requirements of the output voltage, which can be determined by the following formula:
In the formula, Delta; Vo is the output voltage ripple,Δ IL is the inductor current ripple, Fs is the PWM operating frequency, and ESR is the equivalent series resistance of the output capacitor.
6 Output voltage setting
The output voltage of CXSD62676 is; The two voltage divider resistors on the FB pin are set, and the reference voltage of the internal error amplifier is; 1.25V， As shown in the figure
As shown in 8.5, output voltage; Vout=（1+R1/R2）*1.25V， To set the output voltage to; 13.75V， Can be set; R1 is 10K, R2 is 1K,
Output voltage; Vout=（1+10/1）*1.25V=13.75V。
Figure 8.5 CXSD62676 Output Voltage Adjustment Circuit
Conclusion
Whether it's electric vehicle converters, industrial control systems, or fast charging equipment, CXSD62676High reliability, flexible output, and low-cost advantagesProvided engineers with a one-stop power solution. By rational selection and layout design, its 5A output potential can be fully utilized to meet the needs of the next generation of high-performance power supplies.
Extended Application：Combined with the super fast charging protocol chip, a 65W-100W multi port fast charging module can be developed; In solar inverters, stable conversion from 12V/24V battery pack to 5V/12V is supported.
Technical Specifications (Product PDF)
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Product packaging diagram;
Selection Guide for Related Chips More related products .....
| model | VCC startup voltage | VCC shutdown voltage | Input voltage range | starting current | switching frequency | Output voltage accuracy | Built in power transistor | feature | encapsulation |
| CXDC65167 | 6.5V | 3.5V | 20-60V | Built in quick start | 10-100K， Peripheral can be set | 3% | have | 48V battery power supply system step-down switch power supply chip | ESOP8 |
| CXAC85204 | 16V | 9V | 20-150V | 3uA | frequency jitter | 1.5% | have | Non isolated system constant voltage and 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 constant current and constant voltage charging of batteries | SOP16 |
| CXSU63303 | - | - | 7-150V | External auxiliary power supply | 70K | 1.5% | none | Voltage regulator control chip, supporting high-voltage and high current protection solutions | QFN32 |
| CXSU63304 | - | - | 13-90V | External auxiliary power supply | 100K | 1.5% | none | Digital power supply chip supporting PD3.0 protocol for voltage regulation | QFN64 |
| CXSU63305 | 3.65V | 3.6V | 4-600V | 50uA | 0-300K， Peripheral can be set | 1.5% | none | Boost synchronous rectification scheme, supporting high voltage and high current schemes | SOP16 |
| CXSD62669 | 16V | 9V | 20-90V | 3uA | frequency jitter | 1.5% | have | Non isolated system constant voltage and constant current output | SOP7 |
| CXSD62670 | 16V | 9V | 20-600V | 3uA | frequency jitter | 1.5% | have | Non isolated system constant voltage and 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 locking, flexible and adjustable output voltage | ESOP8 |
| CXSD62673 | - | - | 10-100V | Built in quick start | 120KHz | 3% | have | Zero power consumption enabled, flexible and adjustable output voltage | ESOP8 |
| CXSD62674 | - | - | 10-120V | Built in quick start | 120KHz | 3% | have | Zero power consumption enabled, flexible and adjustable output voltage | ESOP8 |
| CXSD62675 | - | - | 10-120V | Built in quick start | 120KHz | 3% | have | 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 locking, flexible and adjustable output voltage | ESOP8 |
| CXSD62678 | 4.6V | 3.8V | 4-600V | 50uA | 0-300K， Peripheral can be set | 1.5% | none | Voltage reduction synchronous rectification scheme, supporting high voltage and high current schemes | SOP16 |
| CXSD62679 | 16.5V | 8V | 10-600V | 200uA | 0-300K， Peripheral can be set | 1.5% | none | Synchronous rectification, highefficiencyCan support constant current and constant voltage charging of batteries | SOP16 |
| CXSD62680 | 8.5V | 7.5V | 10-600V | 200uA | 0-300K， Peripheral can be set | 1.5% | none | Synchronous rectification, highefficiencyCan support constant current and constant voltage charging of batteries | SOP16 |
| CXSD62681 | 9.5V | 7.8V | 11-250V | 200uA | 0-300K， Peripheral can be set | 1.5% | none | Synchronous rectification, highefficiencyShort circuit locking, built-in temperature protection, etc | SSOP16 |
| CXSD62682 | 9.5V | 7.8V | 11-100V | 200uA | 0-300K， Peripheral can be set | 1.5% | have | Synchronous rectification, highefficiencyShort circuit locking, built-in temperature protection, etc | QFN32 |
| CXSD62683 | 9.5V | 7.8V | 11-30V | 200uA | 0-300K， Peripheral can be set | 1.5% | have | Synchronous rectification, highefficiencyShort circuit locking, built-in temperature protection, etc | QFN32 |
| CXSD62684 | - | - | - | External auxiliary power supply | Maximum operating frequency 100KHz | - | none | Digital algorithm current mode synchronous voltage reduction control chip | SSOP24 |
| CXSD62685 | 9.5V | 7.8V | 10-25V | 80uA | 0-300K, Peripheral adjustable | 1.50% | none | Synchronous rectification step-down power supply control chip | SSOP16 |
