CXSD62669 is a synchronous rectification step-down DC-DC power management chip specially designed for industrial-grade high-current scenarios. It supports 10V-25V wide voltage input and can drive more than 20A output current. Its innovative architecture integrates multiple protection functions and is suitable for high-reliability applications such as PC power supplies, fast charging equipment, and industrial control systems.
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[ CXSD62669 ]"
CXSD62669: high performance wide voltage input step-down DC-DC power management chip
CXSD62669 is a specially designed for industrial-grade high-current scenarios.Synchronous Rectifier Buck DC-DC Power Management Chip, support10V-25V wide voltage input, can be drivenOutput current above 20A. Its innovative architecture integrates multiple protection functions and is suitable for high-reliability applications such as PC power supplies, fast charging equipment, and industrial control systems.
Core Features Advantage
1. High-performance design
a. Synchronous rectification scheme improves conversion efficiency and reduces power loss
B. Adjustable switching frequency (125kHz typical), flexible configuration via external resistor (RI pin)
C. programmable dead time (250ns-1000ns), adapt to different MOS tube requirements
Multiple protection mechanisms
a. Short circuit latch protection: Trigger lock when the output voltage is lower than 75% of the set value
B. Cycle-by-cycle current limiting: Support built-in/external resistor to set peak current (l = 0.19V/R)
c.155 ℃ over-temperature protection: Prevent thermal runaway
d.80V high voltage suspension power supply (VB pin) to enhance system reliability
3. Simplify circuit design
a. Built-in MOS sampling protection, reduce external components
B. SSOP16 compact package (4.9 × 6.0mm) saves space
c. Soft start (SS pin), enable control (EN pin) to improve power management
Typical Application Design Guide
1. Voltage setting: Configure the output voltage through the FB pin voltage divider resistor, formula:
: R1 = 10kΩ, R2 = 1kΩ & rarr; vₒᵤ= 14.3v
2. Inductor Selection(Continuous mode):
Recommended ripple current (I am) ≤ 30% maximum output current
3.PCB layout key
VCC/GND capacitor and VB/VS bootstrap capacitor need to be close to the chip pin. The high current path uses short and wide traces.
Industrial Scenario Application
2. Fast charging power supplySupports external MOS for high power density
3. Inverter system: Suspension voltage design has strong anti-interference
Design attention: When the input voltage is> 18V, it is recommended that the external CXLD78L12 be VCC stabilized to ensure the reliability of the drive.
Detailed description of application design parameters
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, it is recommended to add a CXLD78L12 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 trace is as wide and short as possible.
5 MOS tube selection
The MOS tube selects low internal resistance and low junction capacitance, which can provide good performance for the CXSD62669 voltage reducer.
6 Output inductance
CXSD62669 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.
7 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.
8 Output voltage setting
The output voltage of the CXSD62669 is set by the two voltage divider resistors on the FB pin, and the internal error amplifier reference voltage is 1.3V, as shown in Figure 8.5
As shown in, the output voltage Vout = (1R1/R2)* 1.3V. if you need to set the output voltage to 14.3V, you can set R1 to 10K,R2 to 1K, and output
Voltage Vout =(1 10/1)* 1.3V = 14.3V.
9 Peak current limit setting
The CXSD62669 peak current limit is determined by the current limiting resistor R3 parameter
Peak current Ipeak = 0.19V/R3.
Built-in power tube internal resistance current limiting case: CXSD62669 peak current limit is determined by the power tube internal resistance
10 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, at this time
The power tube is turned off. The chip VCC needs to be powered on again or the EN pin needs to be triggered again to restore the output.
Summary:CXSD62669 by virtueHigh integration, flexible configuration and strong protection capabilityIt is an ideal solution for medium and high power DC-DC conversion, which significantly reduces the complexity and cost of system development.
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| 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 |
