In the field of industrial power supply, LED driver and communication equipment, efficient and reliable power management chip is the core of the stable operation of the system. As a power management IC designed for dual-transistor forward topology, CXAC85256 integrates 600V half-bridge drive, active synchronous rectification and multiple protection functions, providing a one-stop solution for high-voltage and high-current applications.
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[ CXAC85256 ]"
CXAC85256: high performance dual-tube forward power supply solution
In the field of industrial power supply, LED driver and communication equipment, efficient and reliable power management chip is the core of the stable operation of the system.CXAC85256As a power management IC designed for dual-transistor forward topology, it integrates 600V half-bridge drive, active synchronous rectification and multiple protection functions, providing a one-stop solution for high-voltage and high-current applications.
1. core features and benefits
1. High integrated design
a. Built-in 600V half-bridge driver, can directly drive MOSFET, simplify the external circuit.
B. Integrated 5V reference voltage (± 2% accuracy, 10mA drive capability), oscillator, error amplifier and soft start circuit.
c. Support0-300kHz Operating Frequency Adjustment, only a single capacitor is required (formula: f = 6.6 × 106/Cp,Cpin pF).
Multiple protection mechanisms
a.UVLO undervoltage lockout: VCC turn-on voltage 16.5V (typical value), turn-off voltage 8V to prevent low voltage abnormalities.
B. Week-by-week current limit protection: The peak current is set by an external resistor (IPK= 180mV /RSen）。
c. Short circuit protection: Short circuit triggers the gap working mode to reduce the thermal stress of the power tube.
3. High efficiency synchronous rectification control: Provides PPWM/PPWMN complementary signals (400ns lead control), optimizes synchronous rectification MOSFET timing, and significantly reduces conduction loss.
2. typical application scenarios
1. Industrial power supply: Support wide input voltage (VCC:9-20V, VB:9-600V), adapt to harsh environment.
2.LED display driver: 66kHz high frequency PWM(CT = 100pF), with synchronous rectification to improve energy efficiency.
3. Battery Charger/Telecom Power SupplyShort circuit protection combined with soft start (SS pin) to avoid surge impact.
4. Isolated DC-DC Conversion: Dual drive output (HO/LO) simplifies half-bridge architecture design.
3. Key Design Guide
1.VCC capacitor selection: External connection required47 μF storage capacitor: Affect the short-circuit protection response time, too small capacity will cause the power tube to overheat.
2. Oscillator Configuration: Frequency capacitor (CP pin) Recommended 100pF ceramic capacitor, corresponding to 66kHz operating frequency.
3.PCB layout points
a.REF5V pin needs to be added nearby1 μF ceramic capacitorFilter out high frequency noise.
B. power ground (COM) and signal ground (VSS) single point connection, reduce interference.
4. Initiate process optimization: External resistor charges VCC capacitor & rarr; Chip activates after reaching 16V & rarr; Auxiliary winding takes over power supply (Figure 6-1/6-2).
4. Electrical Performance Highlights
| Parameters | Condition | Typical value |
|---|---|---|
| Reference voltage | VCC=12V | 4.9V |
| driving ability | HO/LO pull current | 2A |
| Duty cycle | CT=100pF | 50% |
| temperature drift | Full scope of work | ±5% |
Why did 5. choose CXAC85256?
1. High reliability: SOP16 package is compatible with industrial temperature (-45 ℃ ~ 125 ℃), and 600V withstand voltage ensures high voltage safety.
2. Design simplification: Built-in synchronous rectification timing, reducing peripheral components by more than 30%.
3. Cost advantages: Single-chip integrated drive control to replace traditional multi-IC solutions.
Application Tips: In the AC-DC scheme (Figure 6-1), using PPWM signal to drive the synchronous rectifier can improve the efficiency by 5-8%; For DC-DC applications (Figure 6-2), it is recommended to connect a 100Ω resistor in series with the IS pin to suppress noise.
Through high integration and intelligent protection functions, the CXAC85256 provides engineers with a power management platform with both performance and robustness for the design of next-generation high-performance industrial power systems.
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Product packaging diagram
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