Overview
The L6571AD, produced by STMicroelectronics, is a high-voltage half-bridge driver with an integrated oscillator. This device is designed to drive external n-channel power MOSFETs and IGBTs, making it suitable for various high-voltage applications. The L6571AD features a programmable oscillator frequency, which can be set using external resistor and capacitor components. It also includes internal logic to ensure a dead time, preventing cross-conduction of the power devices. The device is available in two versions, L6571A and L6571B, differing in their internal dead times (1.25 μs and 0.72 μs, respectively).
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VS) | 10 | - | - | V |
| Floating Supply Voltage (VBOOT) | - | - | 500 | V |
| High Side Switch Source Output (VOUT) | -1 | - | VBOOT - VCL | V |
| High Side Switch Gate Output (VHVG) | -1 | - | VBOOT | V |
| Low Side Switch Gate Output (VLVG) | - | - | 14.6 | V |
| High Side Driver Source Current (IHVG) | 110 | 175 | - | mA |
| High Side Driver Sink Current (IHVG) | 190 | 275 | - | mA |
| Low Side Driver Source Current (ILVG) | 110 | 175 | - | mA |
| Low Side Driver Sink Current (ILVG) | 190 | 275 | - | mA |
| Internal Dead Time (td) | 0.85 | 1.25 | 1.65 | μs (L6571A) |
| Internal Dead Time (td) | 0.50 | 0.72 | 0.94 | μs (L6571B) |
| Oscillation Frequency (fout) | 57 | 60 | 63 | kHz |
| Storage Temperature (Tstg) | -40 | - | 150 | °C |
| Junction Temperature (TJ) | -40 | - | 150 | °C |
| Ambient Temperature (Tamb) | -40 | - | 125 | °C |
Key Features
- High Voltage Capability: The device can handle high voltage rails up to 600 V and features a floating supply voltage up to 500 V.
- Programmable Oscillator Frequency: The oscillator frequency can be programmed using external resistor and capacitor components.
- Internal Logic for Dead Time: Ensures a dead time to prevent cross-conduction of the power devices, with two versions available (L6571A and L6571B) having different dead times (1.25 μs and 0.72 μs, respectively).
- Low Start-Up Current: Very low start-up current of 150 μA.
- Undervoltage Lockout with Hysteresis: Protects the device from undervoltage conditions.
- High dV/dt Immunity: Up to ±50 V/ns, ensuring robust operation in high-voltage environments.
- ESD Protection: ESD immunity for certain pins up to 900 V (human body model).
Applications
- Power Supplies: Suitable for use in high-voltage power supplies, including offline switch-mode power supplies.
- Motor Control: Can be used in motor control applications where high-voltage and high-current driving are required.
- Industrial Automation: Applicable in various industrial automation systems that require reliable high-voltage switching.
- Consumer Electronics: Used in consumer electronics that require efficient and reliable high-voltage power management.
Q & A
- What is the maximum high voltage rail the L6571AD can handle?
The L6571AD can handle high voltage rails up to 600 V.
- How can the oscillator frequency be programmed in the L6571AD?
The oscillator frequency can be programmed using external resistor and capacitor components.
- What are the different versions of the L6571AD and how do they differ?
The L6571AD comes in two versions, L6571A and L6571B, which differ in their internal dead times (1.25 μs and 0.72 μs, respectively).
- What is the start-up current of the L6571AD?
The start-up current of the L6571AD is very low, at 150 μA.
- Does the L6571AD have undervoltage protection?
Yes, the L6571AD features undervoltage lockout with hysteresis.
- What is the dV/dt immunity of the L6571AD?
The L6571AD has a dV/dt immunity up to ±50 V/ns.
- Does the L6571AD have ESD protection?
Yes, the L6571AD has ESD immunity for certain pins up to 900 V (human body model).
- What are the typical output currents for the high and low side drivers?
The high and low side drivers can deliver 170 mA source and 270 mA sink currents.
- What is the typical oscillation frequency of the L6571AD?
The typical oscillation frequency is around 60 kHz, depending on the external resistor and capacitor values.
- What are the recommended operating temperatures for the L6571AD?
The recommended ambient temperature range is -40°C to 125°C, and the junction temperature range is -40°C to 150°C.
