LM5037MT/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High voltage start-up - Wide input voltage range - Adjustable switching frequency - Current limit protection - Overvoltage protection - Undervoltage lockout - Soft-start capability

Package: TSSOP-16

Essence: The LM5037MT/NOPB is a voltage mode PWM controller designed for high voltage applications. It provides various protection features and adjustable parameters to control the switching frequency and current limit.

Packaging/Quantity: The LM5037MT/NOPB is available in a TSSOP-16 package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 9V to 100V
• Output Voltage Range: 0.8V to 90V
• Switching Frequency Range: 50kHz to 1MHz
• Maximum Duty Cycle: 95%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM5037MT/NOPB has the following pin configuration:

1. VCC: Power supply voltage input
2. GND: Ground reference
3. FB: Feedback pin for voltage regulation
4. COMP: Compensation pin for loop stability
5. CS: Current sense pin for current limit protection
6. SS/TR: Soft-start/Shutdown control pin
7. RT/CT: Timing resistor/capacitor connection pin
8. SYNC: Synchronization input pin
9. DRVH: High-side gate driver output
10. DRVL: Low-side gate driver output
11. VREF: Reference voltage output
12. UVLO: Undervoltage lockout pin
13. OVP: Overvoltage protection pin
14. SS/TR: Soft-start/Shutdown control pin
15. VCC: Power supply voltage input
16. GND: Ground reference

Functional Features

• High voltage start-up: The LM5037MT/NOPB can operate from a wide input voltage range, making it suitable for high voltage applications.
• Adjustable switching frequency: The switching frequency can be adjusted using an external resistor and capacitor, allowing flexibility in design.
• Current limit protection: The IC incorporates a current sense pin to monitor the load current and protect against excessive current flow.
• Overvoltage protection: The OVP pin provides protection against overvoltage conditions, ensuring the safety of the circuit.
• Undervoltage lockout: The UVLO pin prevents operation below a certain voltage threshold, protecting the system during low voltage conditions.
• Soft-start capability: The SS/TR pin enables soft-start functionality, gradually ramping up the output voltage to prevent excessive inrush current.

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile application in various voltage levels. - Adjustable switching frequency provides flexibility in design. - Comprehensive protection features ensure the safety and reliability of the system. - Soft-start capability reduces inrush current and extends the lifespan of components.

Disadvantages: - Limited maximum duty cycle may restrict certain applications requiring higher duty cycles. - TSSOP-16 package may not be suitable for all PCB layouts or assembly processes.

Working Principles

The LM5037MT/NOPB operates as a voltage mode PWM controller. It compares the feedback voltage (FB) with a reference voltage (VREF) to generate an error signal. This error signal is then amplified and used to control the duty cycle of the PWM signal generated by the gate driver outputs (DRVH and DRVL). By adjusting the duty cycle, the LM5037MT/NOPB regulates the output voltage.

Detailed Application Field Plans

The LM5037MT/NOPB is commonly used in the following applications:

1. Power supplies for industrial equipment
2. Telecom and networking equipment
3. LED lighting systems
4. Motor drives
5. Solar inverters

Detailed and Complete Alternative Models

Some alternative models to the LM5037MT/NOPB include:

1. LM5038: Similar voltage mode PWM controller with additional features such as adjustable slope compensation.
2. UC3843: Current mode PWM controller suitable for low voltage applications.
3. LT1241: High voltage start-up PWM controller with integrated power MOSFET drivers.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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