TPS23770 Texas instruments

TPS23770

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TPS23770

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Описание

The TPS23750 integrates the functionality of the TPS2375 with a primary side dc/dc PWM controller. The designer can create a front-end solution for PoE-PD applications with minimum external components. The TPS23770 is identical to the TPS23750 with the exception of the undervoltage lockout turn-on voltage, which is compatible with legacy systems. The PoE front end has all the necessary IEEE 802.3af functions including detection, classification, undervoltage lockout and inrush control. The PoE input switch is integrated within the TPS23750. The dc/dc controller section is designed to support flyback, forward, and nonsynchronous low-side switch buck topologies. The external switching MOSFET and current sense resistor provide flexibility in topology, power level, and current limit. The full-featured dc/dc controller includes programmable soft start, hiccup type fault limiting, 50% maximum duty cycle, programmable constant switching frequency, and a true voltage-output error amplifier. Additional protection features provide for robust designs.

Complete 802.3af PoE Interface
- Features derived from the TPS2375
- 100 V, 0.6 Internal Pass MOSFET
- Standard and Legacy UVLO Choices
- Fixed 140 mA Inrush Limit
Primary Side DC/DC Converter Control
- Minimum External Component Count
- Current Mode Control
- Isolated and Non-Isolated Topologies
- Programmable Operating Frequency
- Current Sense Leading-edge Blanking
- 50% Duty Cycle Limiting
- Voltage Output Error Amplifier
Internal PoE and Converter Sequencing
Industry-Standard 20 Lead Package
Industrial Temperature Range, -40°C to 85°C
APPLICATIONS
- All PoE PD Devices Including:
  - Wireless Access Points
  - VoIP Phones
  - Security Cameras

PowerPAD is a trademark of Texas Instruments.

Vin (min) (V)	0
Vin (max) (V)	67
PoE current limit (min) (mA)	405
PoE inrush limit (mA) (typ)	140
rDS(on) per FET (typ) (mΩ)	600
PoE standards supported	802.3at Type 1 (802.3af)
PD power level	13W
DC/DC control	PD and DC/DC
Fault response	Auto Retry
Features	Error Amplifier, Thermal shutdown
Operating temperature range (°C)	-40 to 85
Rating	Catalog