·Compatible with 802.3af Specifications
·100V, 0.6Ω Integrated Pass Switch
·150mA DC Input Current Limit
·450mA PD Operation Current Limit
·Cycle-by-cycle Switch-current Limits
·Integrated 160V 0.8Ω Power Switching
·Integrated 100V Start-Up Circuit
·Programmable Switching Frequency
·Internal Slope Compensation OCP, SCP, and OTP
·Auto-Restart for Opened/Shorted Output
·Duty Cycle Limiting with Line Feed Forward
·Line Over Voltage Protection
·Built-in soft start
The TMI7325B is an integrated IEEE 802.3af PoE compliant Powered Device (PD) power supply solution. It includes a PD interface and an isolated/non-isolated fly-back. The PD interface includes detection and classification modes as well as a 100V output pass device. An inrush current limit is included to charge the input capacitor slowly without interruption due to die heating. The DC-DC converter integrates a 160V power switch, which can convert the energy of PD with lower loss. Further it has the functions of internal soft-start and automatic retry. Besides, it has Over Current Protection (OCP), output short-circuit, Over Voltage Protection (OVP) and thermal shutdown protection, and can keep no-load operation through skip cycle. The DC-DC switching frequency supports external resistance setting and external clock synchronization. The TMI7325B features power good output with inrush completion delay and is available in a thermally enhanced 4mm x 6mm DFN-20 package.
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