Overview
The LM5030MM/NOPB, produced by Texas Instruments, is a high-voltage Push-Pull Current Mode PWM Controller. This device is designed to implement push-pull and bridge topologies using current-mode control. It features a high-voltage start-up regulator, dual mode current limit, slope compensation, and thermal shutdown, all packaged in a small 10-pin VSSOP or WSON package. The LM5030 is suitable for DC-DC converter applications with input voltages up to 100 VDC and output power ranging from 15 W to 150 W.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VIN to GND (Survival) | -0.3 | 100 | V | |
| VCC to GND (Survival) | -0.3 | 16 | V | |
| RT to GND (Survival) | -0.3 | 5.5 | V | |
| All other pins to GND (Survival) | -0.3 | 7 | V | |
| Operating Junction Temperature | -40 | 150 | °C | |
| Storage Temperature | -55 | 150 | °C | |
| Oscillator Frequency | 200 | kHz | ||
| Output High Saturation Voltage | 0.75 | V | ||
| Output Low Saturation Voltage | 0.75 | V | ||
| Rise Time (Cload = 1 nF) | 16 | ns | ||
| Fall Time (Cload = 1 nF) | 16 | ns | ||
| Thermal Shutdown Temperature | 165 | °C |
Key Features
- Internal High-Voltage Start-Up Regulator: Operates over a wide input range of 14 V to 100 V.
- Single Resistor Oscillator Setting: Allows for adjustable oscillator frequency.
- Error Amplifier: High gain error amplifier with a noninverting reference tied to 1.25 V.
- Precision Reference: Internal 1.25 V reference.
- Dual Mode Overcurrent Protection: Cycle-by-cycle current limit and second-level current limit.
- Slope Compensation: Internally buffered oscillator ramp added to the PWM comparator input.
- Softstart: Gradual start-up to reduce stresses and surges.
- Thermal Shutdown: Protects the IC from excessive junction temperature.
- Direct Optocoupler Interface: Supports isolation devices.
- 1.5-A Peak Gate Drivers: Dual alternating gate drivers.
- Sync Capability: Synchronizable with an external clock.
Applications
- Telecommunication Power Converters: Suitable for high-voltage DC-DC conversion in telecom systems.
- Industrial Power Converters: Used in various industrial power supply applications.
- +42-V Automotive Systems: Applicable in automotive systems requiring high-voltage conversion.
- DC-DC Converters: Ideal for push-pull and bridge topologies with input voltages up to 100 VDC and output power from 15 W to 150 W.
Q & A
- What is the input voltage range of the LM5030?
The LM5030 operates over an input voltage range of 14 V to 100 V.
- What type of oscillator does the LM5030 use?
The LM5030 uses a single-resistor oscillator setting, allowing for adjustable oscillator frequency.
- What is the purpose of the internal high-voltage start-up regulator?
The internal high-voltage start-up regulator allows the device to start up directly from line voltages as high as 100 V and sources current into an external capacitor connected to the VCC pin.
- How does the slope compensation work in the LM5030?
The LM5030 integrates slope compensation by buffering the internal oscillator ramp and summing it internally to the current sense (CS) signal.
- What is the function of the softstart feature in the LM5030?
The softstart feature allows the converter to gradually reach the initial steady state operating point, reducing start-up stresses and surges.
- What is the thermal shutdown temperature of the LM5030?
The thermal shutdown temperature is typically 165°C, protecting the IC from excessive junction temperature.
- Can the LM5030 be used in automotive systems?
- What are the typical applications of the LM5030?
The LM5030 is used in telecommunication power converters, industrial power converters, and DC-DC converters with push-pull and bridge topologies.
- How many gate drivers does the LM5030 have, and what is their peak current rating?
The LM5030 has two alternating gate drivers, each capable of sinking 1.5-A peak current.
- What is the maximum duty cycle for each output of the LM5030?
The maximum duty cycle for each output is inherently limited to less than 50%.
