MOSFET controller

18 August 2010 Power Electronics / Power Management

Diodes Incorporated has released a synchronous MOSFET controller for driving a MOSFET in place of a Schottky diode in the secondary side of flyback and resonant converters. Designed to maximise circuit efficiency and help achieve Energy Star product ratings, the ZXGD3103N8 enables designers to reduce rectifier losses by up to 70% and increase power supply efficiency by up to 3,5%.

Comprising a differential amplifier, detector and high-current driver, the device monitors MOSFET reverse voltage and applies a positive turn-on voltage to the gate if body diode conduction is detected. Being proportional to the MOSFET drain-source reverse voltage, the gate drive voltage guards against premature turn-off of the MOSFET, thereby maximising circuit efficiency.

To further improve efficiency, the controller’s low detector threshold voltage (typically 10 mV) means that body diode conduction is kept to a minimum. In addition, very fast turn-off propagation and fall times, respectively 15 and 20 ns, ensure shoot-through or reverse current conduction are minimised. The SO8 packaged ZXGD3103N8 can be powered directly from supply rails between 5 and 15 V or higher via an external regulator. Its ability to block drain voltages up to 180 V means no external clamping circuit is required and its low standby current, typically 5 mA, enables compliance with the Energy Star standby rating.

For more information contact Dennis Walden, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

Further reading:

Power efficiency and robustness in electronics design
Power Electronics / Power Management
Mouser Electronics recently announced a new eBook in collaboration with Analog Devices highlighting essential strategies for optimising power systems.

Read more...

---

USB Type-C-powered controllers
Future Electronics Power Electronics / Power Management
Diodes Incorporated has released two USB Type-C PD 3.1 extended power range sink controllers that can be embedded into battery-powered devices.

Read more...

---

Multicell battery monitoring
Altron Arrow Power Electronics / Power Management
The LTC6811 from Analog Devices is a multicell battery stack monitor that measures up to 12 series connected battery cells with a total measurement error of less than 1,2 mV.

Read more...

---

Full telemetry in tiny DC-DC converters
RS South Africa Power Electronics / Power Management
The FS160* series of µPOL DC-DC converters from TDK all offer full telemetry, provide increased performance, and are remarkable for extraordinary power density in the smallest sizes.

Read more...

---

Power IC supplies 1650 W
EBV Electrolink Power Electronics / Power Management
Power Integrations has announced a two-fold increase in power output from the HiperLCS-2 chipset with the new device now being able to deliver up to 1650 W of continuous output power.

Read more...

---

High-voltage step-down DC-DC converter
Altron Arrow Power Electronics / Power Management
The MAX17793 is a high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operating over an input voltage range of 3 to 80 V.

Read more...

---

High-voltage contactors
RS South Africa Power Electronics / Power Management
TDK Corporation has announced two new additions to its high-voltage contactor portfolio for harsh environments: the HVC43MC with integrated mirror contact and the HVC45 with enhanced short-circuit current handling capability.

Read more...

---

Chokes rated at 36 A
RS South Africa Power Electronics / Power Management
TDK Corporation has launched the EPCOS SurfIND series, a new range of current-compensated ring core double chokes for high currents and surface mounting.

Read more...

---

RF arrestor provides robust protection
RFiber Solutions Power Electronics / Power Management
NexTek’s range of coaxial RF surge and lightning arrestors are designed and built to provide robust protection for any radio or coaxial RF transmission application.

Read more...

---

Wide-Bandgap Developer Forum 2025
Power Electronics / Power Management
To give designers the ultimate in design flexibility, the entire range of WBG power semiconductors will be provided including discretes, modules, and highly integrated solutions ranging from 40 V to 700 V for GaN and 400 V to 3,3 kV for SiC.

Read more...

---