NEX81801DA; NEX81802DA
Adaptive Synchronous Rectifier (SR) Controller
The NEX81801DA and NEX81802DA (NEX81801/2DA) are high performance synchronous rectification controllers used in switching mode power supplies. It supports operation in Discontinuous Conduction Mode (DCM), Continuous Conduction Mode (CCM) and quasi-resonant flyback converters.
The NEX81801/2DA regulates the forward drop voltage of an external synchronous rectifier (SR) MOSFET in two stages. This allows the SR FET to turn off quickly when the VDS becomes positive.
The externally adjustable turn-on blanking time can effectively prevent the synchronous rectifier from being falsely turned off due to leakage inductance and parasitic parameter oscillation.
The adaptive turn-on detection circuit can prevent the SR from being mistakenly turned on when the VDS DCM oscillation crosses zero during some load conditions. The adaptive turn-on detection circuit also enhances SR conduction efficiency during light load conditions, thereby improving the average efficiency of the power supply across the entire load range.
The synchronous switch can be configured at high-side or low-side output without auxiliary windings or other power sources, because the NEX81801/2DA has a self-supply capability.
The NEX81801/2DA uses TSOT23-6 packaging with low thermal resistance. This can effectively reduce the junction temperature of the chip, making it suitable for high-density power supply design.
Features and benefits
Supports DCM, CCM, QR operation
Supports up to 800 kHz switching frequency
Standard and logic level MOSFET driving capability
Wide output range down to 0 V with 2-channel VCC supply
No need for auxiliary winding for high-side or low-side rectification
Smart proportional gate driver for fast SR turn-off at CCM
Adjustable turn-on blanking time for increased noise immunity
Proprietary adaptive turn-on detection prevents SR FET from falsely turning on during DCM operation
10 ns typical turn-off propagation delay
Available in a TSOT23-6 FC package
ESD protection:
HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V
CDM: ANSI/ESDA/JEDEC JS-002 class C2a exceeds 500 V
Applications
USB PD/QC chargers
AC/DC adapters for portable devices
Flyback SMPS with high-efficiency requirements
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封裝
| 型號 | 可訂購的器件編號，（訂購碼(12NC)） | 狀態(tài) | 標(biāo)示 | 封裝 | 外形圖 | 回流焊/波峰焊 | 包裝 |
|---|---|---|---|---|---|---|---|
| NEX81801DA | NEX81801DAZ (935692117342) |
Active | ND3 |
TSOT23‑6 (SOT8061-1) |
SOT8061-1 | SOT8061-1_342 | |
| NEX81802DA | NEX81802DAZ (935691936342) |
Active | ND4 |
TSOT23‑6 (SOT8061-1) |
SOT8061-1 | SOT8061-1_342 |
環(huán)境信息
| 型號 | 可訂購的器件編號 | 化學(xué)成分 | RoHS | RHF指示符 |
|---|---|---|---|---|
| NEX81801DA | NEX81801DAZ | NEX81801DA |
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| NEX81802DA | NEX81802DAZ | NEX81802DA |
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文檔 (3)
| 文件名稱 | 標(biāo)題 | 類型 | 日期 |
|---|---|---|---|
| NEX8180X | Adaptive Synchronous Rectifier (SR) Controller | Data sheet | 2025-04-16 |
| AN90063 | Questions about package outline drawings | Application note | 2025-10-22 |
| SOT8061-1 | plastic, surface-mounted package; 6 leads; 0.95 mm pitch; 2.9 mm x 1.6 mm x 1.1 mm body | Package information | 2024-04-09 |
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