Overview
The LM5030MMX/NOPB is a high-voltage Push-Pull Current Mode PWM Controller manufactured by Texas Instruments. This device is designed to implement push-pull and bridge topologies using current-mode control in a compact 10-pin package. It features an internal high-voltage start-up regulator, error amplifier, precision reference, dual mode current limit, slope compensation, softstart, and thermal shutdown. 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 | 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 | 150 | °C | ||
| Storage Temperature | -55 | 150 | °C | |
| Thermal Shutdown Temperature | 165 | °C | ||
| Output High Saturation Voltage (IOUT = 50 mA) | 0.25 | 0.75 | V | |
| Output Low Saturation Voltage (IOUT = 100 mA) | 0.25 | 0.75 | V | |
| Rise Time (Cload = 1 nF) | 16 | ns | ||
| Fall Time (Cload = 1 nF) | 16 | ns |
Key Features
- Internal High-Voltage Start-Up Regulator: Operates over a wide input range of 14 V to 100 V.
- Single Resistor Oscillator Setting: Adjustable oscillator frequency.
- Error Amplifier: High gain error amplifier with a noninverting reference tied to 1.25 V.
- Precision Reference: Internal precision reference voltage.
- Dual Mode Current Limit: 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: Alternating gate driver outputs.
- Synchronizable: Can be synchronized to an external signal.
Applications
The LM5030 is designed for various DC-DC converter applications, including:
- Telecommunication Power Converters
- Industrial Power Converters
- +42-V Automotive Systems
It is particularly suited for push-pull topology power converters with input voltages up to 100 VDC and output power in the range of 15 W to 150 W.
Q & A
- What is the maximum input voltage the LM5030 can handle?
The LM5030 can handle input voltages up to 100 V. - 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 slope compensation is achieved by buffering the internal oscillator ramp and summing it internally to the current sense (CS) signal to prevent subharmonic oscillation. - 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. - How does the thermal shutdown protect the LM5030?
The thermal shutdown protects the IC by disabling the output drivers and the bias regulator when the junction temperature exceeds 165°C. - Can the LM5030 be synchronized to an external signal?
Yes, the LM5030 can be synchronized to an external signal if the external frequency is higher than the internal frequency set by the RT resistor. - What is the maximum output current capability of the gate drivers in the LM5030?
The gate drivers can each sink 1.5-A peak. - What are the typical applications of the LM5030?
The LM5030 is typically used in telecommunication power converters, industrial power converters, and +42-V automotive systems. - How does the error amplifier function in the LM5030?
The error amplifier is a high gain amplifier with its noninverting reference tied to 1.25 V, and it can be disabled by connecting the VFB pin to ground. - What is the recommended capacitance range for the VCC regulator in the LM5030?
The recommended capacitance range for the VCC regulator is 0.1 µF to 50 µF.
