LM5116MHX-NOPB Detailed explanation of pin function specifications and circuit principle instructions
The part number you provided, " LM5116MHX/NOPB ," is a product manufactured by Texas Instruments (TI). It is a PWM (Pulse Width Modulation) Controller designed for Power management applications.
The model's package, which is "MHX" in the part number, indicates a QFN (Quad Flat No-lead) package with 28 pins.
Pin Function Specifications and Circuit Principles for LM5116MHX/NOPB
Pinout and Function Details:Here is the detailed description of all the 28 pins of the LM5116MHX/NOPB:
Pin Number Pin Name Pin Function Description 1 VDD Positive Supply Voltage, connect to the system power supply 2 PVDD Power supply for the internal power stage, connected to VDD 3 SW Switching node for the external MOSFET 4 SW Switching node for the external MOSFET 5 VSS Ground pin for the device 6 BOOT Bootstrap capacitor pin for the high-side gate driver 7 VIN Input voltage for the system 8 FREQ Frequency setting pin for oscillator, sets switching frequency 9 COMP Output of the error amplifier, used to set the feedback loop 10 SS Soft-start control pin to limit inrush current 11 EN Enable pin, turns the device on or off 12 PGND Power ground pin, connected to system ground 13 ILIM Current limit threshold pin 14 FB Feedback pin, used to sense voltage at the output 15 VOS Output voltage sense pin, provides feedback for regulation 16 SLOPE Compensation slope pin for controlling the loop dynamics 17 VSENSE Voltage sense pin, used for over-voltage protection 18 UVLO Under-voltage lock-out pin, monitors input voltage levels 19 PGND Ground pin for the power stage 20 TG High-side gate driver output 21 LG Low-side gate driver output 22 PHASE Phase pin, used for synchronous rectification 23 AGND Analog ground, used for low-noise analog reference 24 VREF Voltage reference output, for use with external circuitry 25 CS Current sense pin, for monitoring current through external components 26 SYNC Synchronization pin for external clock signals 27 GND Ground pin for internal logic circuitry 28 VOUT Output voltage pin, connected to the load for power supply Circuit Principles:The LM5116MHX/NOPB is used to regulate the voltage and current in power management systems, such as those used in DC-DC converters. It features both a high-side and low-side driver to control the external MOSFETs , providing efficient power delivery. The feedback and error amplifier section ensure that the output voltage remains stable even under varying load conditions.
The soft-start (SS) function ensures that the converter powers up gradually to avoid large current spikes. The current limit (ILIM) and over-voltage protection (VSENSE) features ensure the safety and reliability of the system by preventing damage from excessive current or voltage.
FAQ for LM5116MHX/NOPB
Here are the 20 most common questions about the LM5116MHX/NOPB:
What is the purpose of the LM5116MHX/NOPB? The LM5116MHX/NOPB is a Pulse Width Modulation (PWM) controller designed to control external MOSFETs in power management systems. What is the supply voltage for the LM5116MHX/NOPB? The supply voltage should be between 4.5V and 60V, depending on the application requirements. What is the function of the 'BOOT' pin? The 'BOOT' pin is used for the bootstrap capacitor, providing the high-side gate driver with the necessary voltage to drive the external MOSFETs. Can I use the LM5116MHX/NOPB for a synchronous rectification design? Yes, the LM5116MHX/NOPB is suitable for synchronous rectification designs, where the external MOSFETs are used for both high-side and low-side switching. How do I set the switching frequency for the LM5116MHX/NOPB? The switching frequency is set by a resistor connected to the 'FREQ' pin, with the value chosen based on the desired frequency range. What is the purpose of the 'VOUT' pin? The 'VOUT' pin is the output voltage pin, where the regulated voltage is delivered to the load. How can I protect the LM5116MHX/NOPB from over-voltage? The 'VSENSE' pin can be used to monitor the output voltage and trigger protection mechanisms when the voltage exceeds the specified limit. What is the function of the 'EN' pin? The 'EN' pin is the enable pin. It turns the device on when pulled high and off when pulled low. What are the maximum ratings for the 'SW' pin? The 'SW' pin is capable of handling voltages up to 60V, which is useful in power conversion applications.How does the LM5116MHX/NOPB achieve current sensing?
The 'CS' pin is used to monitor the current through the external components and provide feedback for current-mode control.Can I use the LM5116MHX/NOPB in a boost converter design?
Yes, the LM5116MHX/NOPB can be used in both buck and boost converter designs, depending on the external components.What is the 'SS' pin used for?
The 'SS' pin is used for soft-start functionality, allowing the voltage to ramp up gradually during power-up to prevent large inrush currents.How can I synchronize the LM5116MHX/NOPB with other devices?
The 'SYNC' pin allows for synchronization with an external clock signal to ensure the converter operates in phase with other systems.What does the 'PHASE' pin do in the circuit?
The 'PHASE' pin is used for synchronous rectification applications, ensuring that the external MOSFETs are properly timed.Is there a thermal shutdown feature in the LM5116MHX/NOPB?
Yes, the LM5116MHX/NOPB includes thermal shutdown protection to prevent the device from overheating.How can I adjust the output voltage of the LM5116MHX/NOPB?
The output voltage is adjusted via feedback and control mechanisms, primarily through the 'FB' and 'VOS' pins.What is the maximum operating temperature for the LM5116MHX/NOPB?
The device operates over a temperature range from -40°C to 125°C.What type of package does the LM5116MHX/NOPB come in?
The LM5116MHX/NOPB comes in a 28-pin QFN package, which is compact and efficient for power management designs.What is the current consumption of the LM5116MHX/NOPB?
The current consumption is typically around 1.8mA, which helps minimize power losses in low-power applications.Can I use the LM5116MHX/NOPB in automotive applications?
Yes, the LM5116MHX/NOPB is suitable for automotive power systems, provided the voltage and temperature requirements are met.This detailed explanation covers the LM5116MHX/NOPB, including its pin functions and the most common questions about its usage.
