Overview
The LM5001SDX/NOPB is a high-voltage switch-mode regulator produced by Texas Instruments. This integrated circuit is designed to implement efficient high-voltage Boost, Flyback, SEPIC, and Forward converters using minimal external components. The LM5001 integrates a 75-V N-Channel MOSFET with a 1-A peak current limit, making it suitable for a wide range of applications, including industrial, communications, and automotive systems.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| VIN to GND | - | - | 76 | V |
| VCC, EN to GND | - | - | 14 | V |
| Maximum Junction Temperature | - | - | 150 | °C |
| Storage Temperature Range | -65 | - | 150 | °C |
| Operating Input Voltage Range | 3.1 | - | 75 | V |
| Peak Current Limit | 0.8 | 1.0 | 1.2 | A |
| Switching Frequency (RRT = 48.7 kΩ) | 225 | 260 | 295 | kHz |
| Maximum Duty Cycle | 80% | 85% | 90% | % |
| Thermal Shutdown Threshold | - | - | 165 | °C |
Key Features
- Integrated 75-V N-Channel MOSFET: With a 1-A peak current limit, enabling efficient high-voltage switching operations.
- Ultra-Wide Input Voltage Range: From 3.1 V to 75 V, making it versatile for various applications.
- Current Mode Control: With selectable compensation and line-voltage feed-forward for superior rejection of input transients.
- Adjustable Output Voltage: With 1.5% output voltage accuracy.
- Integrated High Voltage Bias Regulator: Ensures stable operation across the input voltage range.
- Integrated Current Sensing and Limiting: Prevents the power MOSFET current from exceeding 1 A.
- Thermal Shutdown: Protects the IC from overheating by resetting the driver logic at 165°C.
- Enable / Undervoltage Lockout (UVLO): Prevents operation with less than the minimum desired input voltage.
- Single Resistor Oscillator Programming: Allows for easy setting of the switching frequency up to 1.5 MHz.
- Oscillator Synchronization Capability: Can be synchronized to an external clock.
Applications
- DC-DC Power Supplies: For industrial, communications, and automotive applications.
- Boost, Flyback, SEPIC, and Forward Converter Topologies: Supports various converter configurations.
- Automotive Systems: AEC-Q100 qualified, suitable for automotive environments.
- Industrial and Communications Equipment: Reliable operation in harsh environments.
Q & A
- What is the input voltage range of the LM5001?
The input voltage range is from 3.1 V to 75 V.
- What is the peak current limit of the LM5001?
The peak current limit is 1 A.
- Can the LM5001 be used in automotive applications?
Yes, it is AEC-Q100 qualified, making it suitable for automotive environments.
- How is the switching frequency set in the LM5001?
The switching frequency can be set using a single resistor and can be programmed up to 1.5 MHz.
- What protection features does the LM5001 have?
The LM5001 includes cycle-by-cycle current limiting, thermal shutdown, undervoltage lockout, and remote shutdown capability.
- Can the LM5001 oscillator be synchronized to an external clock?
Yes, the oscillator can be synchronized to an external clock.
- What is the maximum duty cycle of the LM5001?
The maximum duty cycle is 85%.
- How does the LM5001 handle thermal issues?
The LM5001 has thermal shutdown circuitry that resets the driver logic at 165°C and returns to normal operation when the temperature drops by approximately 20°C.
- What is the purpose of the Enable/Undervoltage Lockout (UVLO) pin?
The Enable/UVLO pin prevents operation with less than the minimum desired input voltage and allows for remote shutdown capability.
- What are the typical applications of the LM5001?
The LM5001 is typically used in DC-DC power supplies for industrial, communications, and automotive applications, supporting various converter topologies such as Boost, Flyback, SEPIC, and Forward converters.
