PWM Controller Uses BJTs to Reduce Costs

Dialog iW1679 Digital PWM Controller

Dialog iW1679 Digital PWM Controller

The iW1679 digital PWM controller drives 10-W power bipolar junction transistor (BJT) switches to reduce  costs in 5-V/2-A smartphone adapters and chargers. The controller enables designers to replace field-effect transistors (FETs) with lower-cost BJTs to provide lower standby power and higher light-load and active average efficiency in consumer electronic products.

The iW1679 uses Dialog’s adaptive multimode PWM/PFM control to dynamically change the BJT switching frequency. This helps the system improve light-load efficiency, power consumption, and electromagnetic interference (EMI). The iW1679 provides high, 83% active average efficiency; maintains high efficiency at loads as light as 10%. It achieves less than 30-mW no-load standby power with fast standby recovery time. The controller meets stringent global energy efficiency standards, including: US Department of Energy, European Certificate of Conformity (CoC) version 5, and Energy Star External Power Supplies (EPS) 2.0.

The iW1679 offers a user-configurable, four-level cable drop compensation option. It comes in a standard, low-cost, eight-lead SOIC package and provides protection from fault conditions including output short-circuit, output overvoltage, output overcurrent, and overtemperature.

The iW1679 costs $0.29 each in 1,000-unit quantities.

Dialog Semiconductor
www.iwatt.com

Industrial Double-Break Switch for IP67/68

The MP220 is an industrial high-current switch. It features a single-pole, double-break electrical circuit that enables it to double break two independent electrical circuits.

The MP220 switch utilizes a fast snap action mechanism to transition from break-to-make position. The switch in its standard version is currently IP67 sealed. An improved sealing for IP68 applications with a strengthened cable exit is also available.

The MP220 is available in standard microswitch-size housing with a range of possible actuators and a four-wire potted cable. The switch is EN61058-certified for 250 VAC/10 A with a –40°C-to-130°C operating temperature range.

Contact Microprecision for pricing.

Microprecision Electronics SA
www.microprecision.ch