Overview
The LM5070MTCX-50/NOPB, produced by Texas Instruments, is an integrated Power Over Ethernet (PoE) PD interface and PWM controller. This device is designed to meet the requirements of Class 3 PoE applications and features a comprehensive set of functionalities for power management and conversion. It includes a programmable under-voltage lockout, thermal shutdown protection, and support for both isolated and non-isolated applications. The LM5070 is particularly useful in systems that require efficient power delivery and management over Ethernet connections.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | TSSOP-16, WSON-16 (5 mm x 5 mm) |
| Maximum Duty Cycle | 50% (LM5070-50 device), 80% (LM5070-80 device with slope compensation) |
| Oscillator Frequency | 175-225 KHz (RT = 30.3K), 505-665 KHz (RT = 10.5K) |
| Current Sense Threshold | 0.5V with respect to RTN/ARTN |
| Peak Gate Driver Current | 800 mA |
| COMP to PWM Comparator Gain | 0.33 |
| COMP Open Circuit Voltage | 4.5-6.3 V |
| COMP Short Circuit Current | 0.6-1.5 mA (COMP= 0V) |
| Slope Compensation Amplitude | 105 mV (LM5070-80 device only) |
Key Features
- Programmable Under-voltage Lockout (UVLO) with hysteresis
- Current Mode Pulse Width Modulator with adjustable oscillator frequency
- Support for both isolated and non-isolated applications
- Thermal Shutdown Protection
- Error Amplifier and Reference for non-isolated applications
- Programmable Soft-Start and peak gate driver current of 800 mA
- Cycle-by-cycle over current protection
- Internal high gain error amplifier with open drain output
Applications
The LM5070MTCX-50/NOPB is suitable for a variety of applications, including but not limited to:
- Power Over Ethernet (PoE) devices such as IP phones, security cameras, and wireless access points
- Industrial control systems and automation equipment
- Medical devices requiring reliable power delivery
- Networking equipment and data centers
Q & A
- What is the primary function of the LM5070MTCX-50/NOPB?
The primary function is to serve as an integrated Power Over Ethernet (PoE) PD interface and PWM controller. - What are the available package types for the LM5070?
The LM5070 is available in TSSOP-16 and WSON-16 (5 mm x 5 mm) packages. - What is the maximum duty cycle for the LM5070-50 device?
The maximum duty cycle for the LM5070-50 device is 50%. - How does the LM5070 handle over current protection?
The LM5070 provides cycle-by-cycle over current protection through an internal current sense comparator. - What is the purpose of the error amplifier in the LM5070?
The error amplifier is used for non-isolated applications and is configured as an open drain output. - Can the LM5070 be used in isolated applications?
Yes, the LM5070 supports both isolated and non-isolated applications. - What is the peak gate driver current of the LM5070?
The peak gate driver current is 800 mA. - How is thermal shutdown protection implemented in the LM5070?
The LM5070 includes thermal shutdown protection to prevent overheating. - What is the range of oscillator frequencies for the LM5070?
The oscillator frequency ranges from 175-225 KHz (RT = 30.3K) and 505-665 KHz (RT = 10.5K). - Is the LM5070 compliant with RoHS standards?
Yes, the LM5070 is RoHS compliant.
