MD18624GAA Gate Driver for Avalon 1346 Power Supply repair
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MD18624GAA High-Frequency Dual Gate Driver | 5A Replacement for Avalon 1346 Power Supply Primary-Side Repair
The MD18624GAA is a high-frequency dual-channel gate driver for low-side N-channel MOSFETs, used on the Avalon 1346 power supply to drive the primary-side switching stage. Two independent channels with TTL-compatible inputs and 5A peak source / sink current — exactly what's needed to switch the Avalon 1346's high-gate-charge primary MOSFETs at the high switching frequencies the PSU operates at.
Key spec for PSU rework: 11ns propagation delay with 1ns channel-to-channel matching, 7ns / 6ns rise / fall times (2.2nF load). Critical for synchronous-rectification topologies where deadtime control matters — sloppy delays cause shoot-through, which is exactly the failure mode that takes out an Avalon 1346 PSU's primary MOSFETs and the driver in the same event.
When to Replace the MD18624GAA
- Avalon 1346 PSU primary-side dead after a primary MOSFET failure — the driver usually goes with the MOSFET.
- Asymmetric switching waveforms on the primary gates — delay matching has drifted.
- PSU resets repeatedly under load — driver UVLO triggering near the 4.5V threshold.
- Visible damage on the driver IC package — burnt or cracked after a primary-side fault.
- Adjacent primary MOSFETs also failed — replace driver + MOSFETs together, never just one.
MD18624GAA Specifications
| Parameter | Specification |
|---|---|
| Part Number | MD18624GAA |
| Gate Drive Channels | Two independent channels |
| Peak Output Current | 5A (source and sink) |
| Rise / Fall Time | 7ns / 6ns (2.2nF load) |
| Propagation Delay | 11ns (typical) |
| Channel Matching | 1ns (typical) |
| Operating Supply Range | 4.5V to 26V (28V abs max) |
| Input Voltage Tolerance | -10V to +26V |
| Input Logic | TTL-compatible |
| Undervoltage Lockout | Symmetric (Channel A + B) |
| Stack Detection | Intelligent parallel-operation mode |
| Operating Temperature | -40°C to 140°C |
| Compatible PSU | Avalon 1346 power supply |
| Condition | Brand New |
FAQ — MD18624GAA Gate Driver
Q: Replace just the driver, or driver + adjacent MOSFETs?
A: Always check the MOSFETs the driver was switching. A shorted MOSFET takes the driver out with a Vgs spike in the same event — replacing only the driver and re-energising the PSU usually kills the new driver in seconds. Replace the MOSFET pair and the driver together, then re-power.
Q: Parallel both channels for higher current?
A: The MD18624GAA supports parallel operation of channel A and B via intelligent stack detection — doubles the effective gate-drive current for very high-gate-charge MOSFETs. Refer to the Avalon 1346 PSU schematic for whether the design uses single-channel or parallel mode.
Q: Rework profile?
A: Bottom-side preheat 130–150°C, top-side hot air 320°C with flux paste. Standard SMD rework. Always inspect surrounding caps and check VCC rail for shorts before re-energising — a downstream cap short was likely the original failure cause.
Q: Bulk pricing for Avalon repair benches?
A: Yes — email contact@lys-sz.com for reel-quantity pricing on MD18624GAA stock and matched MOSFET kits.
Related products
- Avalon PSU 3300W Power Supply (A1066 / A1166 / A1246)
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- SRK2000DTR Synchronous Rectifier Controller (Avalon 1346)
- MUR860F Ultrafast Recovery Diode (Avalon PSU3400)
Avalon 1346 PSU repair benches stocking MD18624GAA drivers by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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