Overview
The LM5111-1MX/NOPB is a dual 5-A compound gate driver produced by Texas Instruments. This device is designed to drive two independent N-channel MOSFETs with high current and speed. It features TTL-compatible logic inputs and high-current totem-pole outputs, making it suitable for a variety of high-frequency and high-power applications. The LM5111-1MX/NOPB is available in an SOIC-8 package and is known for its robust performance and compatibility with industry-standard gate drivers.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer | Texas Instruments | |
| Package Type | SOIC-8 | |
| Output Current Capability | 5-A Sink, 3-A Source | A |
| VCC Operating Range | 3.5 to 14 | V |
| VCC Undervoltage Lockout (UVLO) | 2.3 to 3.5 | V |
| Propagation Time | 25 ns (Typical) | ns |
| Rise and Fall Times | 14 ns and 12 ns (Respectively, With 2-nF Load) | ns |
| Operating Junction Temperature | -40°C to +125°C | °C |
| Junction-to-Ambient Thermal Resistance | 112.2 °C/W (SOIC) | °C/W |
Key Features
- Independently drives two N-channel MOSFETs with TTL-compatible logic inputs.
- Compound CMOS and bipolar outputs reduce output current variation.
- 5-A sink and 3-A source current capability.
- Two channels can be connected in parallel to double the drive current.
- Fast propagation times (25 ns typical) and rise and fall times (14 ns and 12 ns respectively with a 2-nF load).
- Supply rail undervoltage lockout protection (UVLO).
- Available in dual noninverting, dual inverting, and combination configurations.
- Pin compatible with industry standard gate drivers such as TC4426/27/28 and UCC27323/4/5.
Applications
- High-frequency power supplies: Often require high-speed, high-current drivers like the LM5111 to provide a high-power buffer stage between the PWM output of the control IC and the gates of primary power MOSFET or IGBT switching devices.
- Synchronous rectifier gate drivers: Used in high-efficiency power conversion systems.
- Switch-mode power supply gate drivers: Essential for driving the MOSFETs in switch-mode power supplies.
- Solenoid and motor drivers: Can be used to drive solenoids and motors due to its high current drive capability.
Q & A
- What is the LM5111-1MX/NOPB used for?
The LM5111-1MX/NOPB is a dual gate driver used to drive two independent N-channel MOSFETs in high-frequency and high-power applications.
- What are the output current capabilities of the LM5111-1MX/NOPB?
The device can source 3 A and sink 5 A of current.
- What is the operating voltage range of the LM5111-1MX/NOPB?
The VCC operating range is from 3.5 V to 14 V.
- What is the propagation time of the LM5111-1MX/NOPB?
The propagation time is typically 25 ns.
- What are the rise and fall times of the LM5111-1MX/NOPB?
The rise time is 14 ns and the fall time is 12 ns with a 2-nF load.
- What is the thermal resistance of the LM5111-1MX/NOPB in an SOIC package?
The junction-to-ambient thermal resistance is 112.2 °C/W.
- Is the LM5111-1MX/NOPB pin compatible with other gate drivers?
Yes, it is pin compatible with industry standard gate drivers such as TC4426/27/28 and UCC27323/4/5.
- How should unused input pins be handled?
Unused input pins (IN_A or IN_B) should be connected to either VEE or VCC to avoid spurious output signals.
- What is the importance of proper grounding in using the LM5111-1MX/NOPB?
Proper grounding is crucial to avoid inductive loops and ensure a low impedance path for current return to ground, which is essential for the device's performance and to minimize EMI.
- Can the LM5111-1MX/NOPB be used in safety-critical applications?
Customers are responsible for determining the suitability of the component for their specific applications, including safety-critical ones, and should validate and test their design implementation accordingly.
