Overview
The L6571A is a high voltage half bridge driver with an integrated oscillator, designed and manufactured by STMicroelectronics. This device is particularly suited for driving external n-channel power MOSFETs and IGBTs in various power conversion applications. The L6571A features a high voltage rail capability of up to 600 V and utilizes BCD (Bipolar-CMOS-DMOS) off-line technology. It includes an internal Zener clamp on the supply voltage (VS) and offers programmable oscillator frequency using external resistor and capacitor configurations.
Key Specifications
| Parameter | Symbol | 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 Driver Gate Output | VHVG | -1 | - | VBOOT | V |
| Low Side Driver Source Current | ILVG SO | 110 | 175 | - | mA |
| Low Side Driver Sink Current | ILVG SI | 190 | 275 | - | mA |
| High Side Driver Source Current | IHVG SO | 110 | 175 | - | mA |
| High Side Driver Sink Current | IHVG SI | 190 | 275 | - | mA |
| Internal Dead Time | td | 0.85 | 1.25 | 1.65 | μs |
| Oscillation Frequency | fout | 57 | 60 | 63 | kHz |
| Storage Temperature | Tstg | -40 | - | 150 | °C |
| Ambient Temperature | Tamb | -40 | - | 125 | °C |
Key Features
- High voltage rail up to 600 V
- BCD (Bipolar-CMOS-DMOS) off-line technology
- Internal Zener clamp on VS (typical 15.6 V)
- Driver current capability: 170 mA source, 270 mA sink
- Very low start-up current: 150 μA
- Undervoltage lockout with hysteresis
- Programmable oscillator frequency using external resistor and capacitor
- Internal dead time to avoid cross-conduction of power devices (1.25 μs for L6571A, 0.72 μs for L6571B)
- dV/dt immunity up to ±50 V/ns
- ESD protection up to 900 V (human body model) for certain pins
Applications
- Power conversion systems, including DC-DC converters and power supplies
- Motor control and drive systems
- High voltage power applications such as inverter systems and SMPS (Switch-Mode Power Supplies)
- Industrial control and automation systems
- Automotive and non-automotive power management systems
Q & A
- What is the maximum supply voltage for the L6571A?
The maximum supply voltage (VS) for the L6571A is 10 V to ensure proper operation within the recommended operating conditions.
- What is the internal dead time for the L6571A and L6571B?
The internal dead time for the L6571A is 1.25 μs, and for the L6571B, it is 0.72 μs.
- How can the oscillator frequency be programmed?
The oscillator frequency can be programmed using external resistor (RF) and capacitor (CF) configurations.
- What is the driver current capability of the L6571A?
The driver current capability is 170 mA source and 270 mA sink for both high and low side drivers.
- Does the L6571A have ESD protection?
- What is the typical start-up current for the L6571A?
The typical start-up current is 150 μA.
- Can the L6571A be driven by an external logic signal?
- What are the package options available for the L6571A?
The L6571A is available in DIP-8 and SO8 packages).
- What is the thermal resistance junction-ambient for the DIP-8 package?
The thermal resistance junction-ambient for the DIP-8 package is 100 °C/W).
- What is the recommended ambient temperature range for the L6571A?
The recommended ambient temperature range is -40°C to 125°C).
