MAX25350
RECOMMENDED FOR NEW DESIGNS1700V No-Opto Flyback Converters
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Overview
Isolated High-Voltage Power Supply
- Input Voltage Range: 30V to 1200V
- Integrated High-Voltage Switch (1700V)
- No-Opto Flyback
- Boundary Mode, DCM Operation for High Efficiency
- Low Quiescent BIAS Current (200μA) in Burst Mode
- Integrated On-Chip Self-Biased Start-up Supply with Short-Circuit Protection
- Programmable Current Limit and Soft-Start
- Fast Start-up Time(s)
- Maximum Switching Frequency up to 300 kHz
- Valley Detection Control for Lower SwitchingLosses
- TC Pin to Compensate for Output Diode Forward-Voltage Drift over Temperature
- Constant-Current/Constant-Voltage (CC/CV) Regulation
- Redundant Reference and Self-Diagnostics forOV/UV Monitoring
- Accurate (±1.5%) OV/UV Monitor
- Built-in Self-Test (BIST) for OV/UV Comparators
- 10.3mm x 7.5mm x 2.5mm, 28-Pin SSOP Package
- 7.5mm Clearance/Creepage between High- andLow-Voltage Pins
- AEC-Q100 Qualified – See Ordering Information for/V Parts
- -40°C to +125°C Temperature Range
ASIL B Compliant
General
The MAX25350/MAX25351/MAX25351B are high-voltage flyback converters that sense the output voltage and current from the flyback waveform, requiring no optocoupler for feedback. The MAX25350/MAX25351/MAX25351B have an integrated 1700V switch which enables them to deliver isolated power from high-voltage battery packs. The devices sample the output voltage from the waveform appearing across an auxiliary winding. High-frequency, quasi-resonant boundary mode operation improves load regulation, reduces transformer size, and maintains high efficiency.
The MAX25350/MAX25351/MAX25351B incorporate an integrated self-biased start-up circuit that removes the need for external resistor dividers or a separate bias supply. After startup, the controller automatically transitions to being powered from the auxiliary winding, improving overall efficiency and reducing component count. They also include a dedicated temperature compensation pin that minimizes output-voltage drift caused by the diode’s forward-voltage variation over temperature. The MAX25351B features higher EN pull-up current as compared to MAX25350/MAX25351.
The MAX25350/MAX25351/MAX25351B operate from a wide range of input supply voltages and can deliver up to 50W of power. They are available in a 28-pin SSOP package with a 7.5mm footprint to meet the creepage and clearance requirements for high voltage.
The MAX25350/MAX25351/MAX25351B have a robust design for the automotive environment and are rated up to ASIL B. Safety documents are available on request. The low quiescent current architecture allows for use in always-on applications, saving critical battery life and extending range.
APPLICATIONS
- Auxiliary and Redundant Power Supply from High-Voltage Input (EV Chargers, Energy Systems)
- Gate Driver Bias Power (Traction Inverter)
Documentation
Data Sheet 1
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Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA).
Request an NDAADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX25350AAIA/V+ | SSOP 28 Pin Package |
This is the most up-to-date revision of the Data Sheet.
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