The DK5V45R20 is a two‑pin synchronous rectifier chip with integrated 45 V NMOS, ultra‑low VF and high efficiency for USB chargers, adapters and LED drivers.
The DK5V45R20 is a simple, high‑efficiency synchronous rectifier chip that integrates a 45 V, 20 mΩ NMOS transistor. It requires only two pins (A and K) that correspond to the anode and cathode of a Schottky diode, eliminating the need for external components and reducing conduction loss.
The device operates with a self‑powered system, providing start‑up voltage (VCC_ON) of 7.6 V and shut‑down voltage (VCC_OFF) of 3.5 V. It is suitable for flyback (PSR, SSR) applications such as USB chargers, adapters and LED drivers, and can be used in DCM & QR modes. The chip is supplied in an SM‑7 package compatible with TO‑277. This manual is written in Chinese.
| NMOS source‑drain breakdown voltage (V(BR)DSS) | 45 V |
|---|---|
| Maximum continuous drain current (ID) | 35 A |
| Maximum power dissipation (PDMAX) | 1 W |
| Thermal resistance junction‑to‑ambient (RθJA) | 76 °C/W |
| Startup voltage (VCC_ON) | 7.6 V |
| Shutdown voltage (VCC_OFF) | 3.5 V |
| On‑resistance (RDS_ON) | 20 mΩ |
| Maximum switching frequency (FS_MAX) | 100 kHz |
The chip is supplied in an SM‑7 package that is compatible with the TO‑277 package.
No, the DK5V45R20 cannot be used in CCM mode; a different version such as DK5V45R20C or DK5V45R20S must be selected.
The startup voltage (VCC_ON) is specified as 7.6 V.
The maximum continuous drain current (ID) is 35 A.