Overview
The LM5033, produced by Texas Instruments, is a high-voltage push-pull voltage mode PWM (Pulse Width Modulation) controller. This IC is designed to implement various topologies such as push-pull, half-bridge, and full-bridge configurations. It features a comprehensive set of functionalities that simplify the design of both open-loop DC-DC converters and closed-loop voltage-controlled converters. The LM5033 operates over a wide input voltage range from 15 V to 90 V, with transient capability up to 100 V, making it suitable for a variety of high-voltage applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage (VIN) | 15 to 99 | V |
| Operating Junction Temperature (TJ) | -40 to 125 | °C |
| Oscillator Frequency | Up to 1 MHz | |
| Output Drivers Peak Current | 1.5 A (source and sink) | A |
| Deadtime | 85 to 185 ns | ns |
| Rise Time (CLOAD = 1 nF) | 16 ns | ns |
| Fall Time (CLOAD = 1 nF) | 16 ns | ns |
| Thermal Shutdown Temperature | 165 °C | °C |
| Thermal Shutdown Hysteresis | 15 °C | °C |
| Package Types | VSSOP (10 pins), WSON (10 pins) |
Key Features
- Internal high-voltage (100 V) start-up regulator
- Single resistor oscillator setting
- Synchronizable with an external clock
- Precision 2.5-V reference output
- Adjustable soft start
- Overcurrent protection with current limit detection
- Direct optocoupler interface
- 1.5-A peak gate drivers
- Thermal shutdown
- Remote shutdown capability
Applications
- Intermediate DC-DC bus converters
- Telecommunication power converters
- Industrial power converters
- 42-V automotive systems
Q & A
- What is the input voltage range of the LM5033? The input voltage range is from 15 V to 90 V, with transient capability up to 100 V.
- What are the package types available for the LM5033? The LM5033 is available in VSSOP (10 pins) and WSON (10 pins) packages.
- What is the maximum oscillator frequency of the LM5033? The LM5033 can operate up to a 1-MHz oscillator frequency.
- Does the LM5033 support synchronization with an external clock? Yes, the LM5033 can be synchronized with an external clock.
- What is the peak current capability of the output drivers? The output drivers have a peak current capability of 1.5 A (both source and sink).
- What is the thermal shutdown temperature of the LM5033? The thermal shutdown temperature is 165 °C.
- Does the LM5033 have overcurrent protection? Yes, the LM5033 includes overcurrent protection with current limit detection.
- Can the LM5033 be used in automotive systems? Yes, the LM5033 is suitable for 42-V automotive systems.
- How is the oscillator frequency set in the LM5033? The oscillator frequency is set by a single external resistor connected between the RT/SYNC pin and ground.
- What is the purpose of the soft-start feature in the LM5033? The soft-start feature allows the converter to gradually reach a steady-state operating point, reducing start-up stresses and current surges.
