Overview
The ADuM4146BRWZ, produced by Analog Devices Inc., is a single-channel, high-voltage isolated bipolar gate driver specifically optimized for driving silicon carbide (SiC) and metal-oxide semiconductor field effect transistors (MOSFETs). This device utilizes Analog Devices' iCoupler® technology to provide isolation between the input signal and the output gate drive, ensuring robust and reliable operation. The ADuM4146 includes a Miller clamp to facilitate robust SiC turn-off with a single-rail supply and features desaturation detection circuitry for protection against high-voltage short-circuit operations.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Short-circuit source current (0 Ω gate resistance) | 11 A | ||
| Short-circuit sink current (0 Ω gate resistance) | 9 A | ||
| Peak current (2 Ω gate resistance) | 4.61 A | ||
| Output power device resistance | <1 Ω | ||
| Output voltage range | Up to 30 V | ||
| Secondary undervoltage lockout (UVLO) - Grade A | 14.5 V (typical) | Positive going threshold | |
| Secondary undervoltage lockout (UVLO) - Grade B and C | 11.5 V (typical) | ||
| Input capacitance | 4.0 pF | ||
| Junction to ambient thermal resistance | 59.35 °C/W | 4-layer printed circuit board (PCB) |
Key Features
- High-voltage isolated bipolar gate driver optimized for SiC and MOSFETs
- iCoupler® technology for input-output isolation
- Miller clamp for robust SiC turn-off with single-rail supply
- Desaturation detection circuitry for short-circuit protection
- Optional internal 500 µA current source and external current source capability
- Multiple UVLO options on VDD2
- CMOS input logic levels
- Operation with unipolar or bipolar secondary supplies
- Dedicated outputs for status readback and fault indication
Applications
The ADuM4146BRWZ is suitable for various high-voltage and high-power applications, including:
- Power conversion systems using SiC and MOSFETs
- Motor drives and control systems
- Renewable energy systems such as solar and wind power
- Industrial power supplies and inverters
- Electric vehicle charging and propulsion systems
Q & A
- What is the primary function of the ADuM4146BRWZ?
The ADuM4146BRWZ is a single-channel, high-voltage isolated bipolar gate driver optimized for driving silicon carbide (SiC) and metal-oxide semiconductor field effect transistors (MOSFETs).
- What is the maximum short-circuit source current of the ADuM4146BRWZ?
The maximum short-circuit source current is 11 A (0 Ω gate resistance).
- What is the purpose of the Miller clamp in the ADuM4146BRWZ?
The Miller clamp provides robust SiC turn-off with a single-rail supply when the gate voltage drops to less than 2 V.
- What protection features does the ADuM4146BRWZ include?
The device includes desaturation detection circuitry for protection against high-voltage short-circuit operations and multiple UVLO options.
- Can the ADuM4146BRWZ operate with both unipolar and bipolar secondary supplies?
- What is the typical secondary undervoltage lockout (UVLO) for Grade A?
- How does the ADuM4146BRWZ provide isolated communication between high and low voltage domains?
- What is the junction to ambient thermal resistance of the ADuM4146BRWZ?
- Can the status of the chip be read back from dedicated outputs?
- What evaluation board is available for the ADuM4146BRWZ?
