ADI LTC3805IDD Adjustable Frequency Current Mode Flyback DC/DC Controller
Shenzhen Mingjiada Electronics Co., Ltd., as a globally renowned distributor of electronic components, maintains long-term stock availability of ADI's LTC3805IDD adjustable frequency current mode flyback DC/DC controller.
This high-performance power management IC features a wide input voltage range of 4.5V to 75V and output voltage capability from 0.8V to 75V, making it suitable for industrial control, communications equipment, and automotive electronics applications.
LTC3805IDD Product Description:
The LTC3805IDD is a current-mode controller specifically designed to drive N-channel MOSFETs in high input/output voltage converter applications. Operating frequency and slope compensation are externally programmable via resistors. Programmable overcurrent detection protects the converter from short-circuit damage. Soft-start functionality is externally programmable via a capacitor, which also enables programmable auto-restart capability.
The LTC3805IDD delivers ±1.5% output voltage accuracy with a quiescent current of just 360μA during normal operation and 40μA during micro-power start-up. Featuring an integrated 9.5V shunt regulator, it can be powered from high input voltages via resistors or directly from low-impedance DC sources of 9V or less.
The LTC3805IDD is available in a 10-pin MSOP package and a 3mm × 3mm DFN package.
Core Technical Features of the LTC3805IDD:
The LTC3805IDD utilises a compact 10-pin DFN package, making it suitable for space-constrained applications.
Wide Input Voltage Range
The LTC3805IDD supports a broad input voltage range from 4.5V to 75V, enabling adaptation to diverse and challenging power supply environments.
This feature makes it particularly suitable for industrial power supplies, communications equipment, and automotive electronics systems where voltage fluctuations are common.
Flexible Output Configuration
The controller delivers output voltages ranging from 0.8V to 75V, meeting the power requirements of a wide variety of loads.
It supports multiple topologies including boost, flyback and SEPIC, offering considerable flexibility to power supply designers.
Adjustable Switching Frequency
The LTC3805IDD's switching frequency is adjustable between 70kHz and 700kHz, allowing designers to optimise the balance between efficiency, external component size and cost.
The device also supports external clock synchronisation to reduce system noise interference.
Comprehensive Protection Features
The chip incorporates multiple protection mechanisms, including programmable under-voltage and over-voltage protection, soft-start functionality, and more, ensuring stable and reliable system operation.
Its operating temperature range spans -40°C to +125°C, making it suitable for applications in harsh environments.
LTC3805IDD Function Control and Programming Capabilities:
The LTC3805IDD offers extensive control and programming capabilities, enabling engineers to precisely adjust power supply parameters for specific requirements.
These functions are implemented via a series of external components, including resistors, capacitors, and clock signals.
Frequency Adjustment and Synchronisation: The operating frequency can be set from 70kHz to 700kHz using a single external resistor.
The device also supports external clock synchronisation, allowing alignment with the system clock to minimise noise interference.
Soft-Start Programming: Utilises an externally capacitive programmable soft-start function to effectively control inrush current during startup, preventing stress on components during power-up.
Protection Features: The device incorporates programmable overcurrent detection with automatic restart capability.
It also provides precise RUN pin thresholds and adjustable hysteresis, enabling designers to precisely control the device's switching timing.
Supply Flexibility: The LTC3805IDD incorporates a 9.5V internal parallel regulator, enabling operation from a high VIN supply via resistors or directly from a low-impedance DC voltage ranging from 4.7V to 8.8V.
This flexible power supply scheme enhances adaptability across diverse power environments.
LTC3805IDD Technical Architecture and Operation:
The LTC3805IDD employs a current-mode control architecture, delivering exceptional transient response and cycle-by-cycle current limiting capability.
This architecture simplifies feedback loop stability design, making it easier for engineers to optimise power supply performance.
The device precisely controls the switching transistor's duty cycle by sensing current and voltage signals, thereby achieving stable voltage output.
An integrated precision reference voltage source ensures accurate and stable output voltage.
Slew Rate Compensation: The device offers adjustable slew rate compensation to prevent subharmonic oscillations when the duty cycle exceeds 50%, enhancing system stability.
Current Sensing: Utilising a mere 100mV current sensing voltage reduces power dissipation across the sense resistor, improving overall efficiency.
Operating Temperature Range: The LTC3805IDD supports a junction temperature range of -40°C to 125°C, ensuring reliable operation in harsh environments.
The device also incorporates enable control and soft-start features, providing comprehensive management capabilities for complex power systems.
Its maximum duty cycle reaches 80%, offering greater design flexibility for wider input and output voltage ranges.
LTC3805IDD Application Areas:
Industrial Control Systems
Within industrial control applications, this controller serves power sections of PLCs, servo drives, and industrial automation equipment, delivering stable and reliable power conversion.
Its wide input voltage range is particularly suited to addressing voltage fluctuations and noise interference common in industrial environments.
Automotive Electronics
The LTC3805IDD is suitable for in-vehicle power management, infotainment systems, and Advanced Driver Assistance Systems (ADAS).
Its extended operating temperature range ensures compliance with the stringent reliability requirements of automotive electronics.
Communications Equipment
Within the communications sector, this device can be employed in power supply designs for 5G base stations, network equipment, and optical modules.
Its high switching frequency and low-noise characteristics help meet the power purity requirements of communications equipment.
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