Power switches protect USB ports

2 September 2009 Circuit & System Protection

Diodes Incorporated has introduced a family of 12 new USB power switches, providing a cost effective and small form fit for USB ports in a wide range of consumer and computing applications.

The USB port has become the de-facto method of connection between many products and is increasingly used as a convenient way to charge or power these devices. Diodes’ new family of products is specifically designed to target this large market opportunity. Both single- and dual-channel power switches are available, with all devices optimised for self-powered and bus-powered USB applications and fully compliant with all USB standards.

The AP21XX high-side power switch range has been created for USB port applications that require fast response and highly accurate over-current and over-temperature protection, such as HD televisions, set-top boxes and PCs. Offering designers 0,75, 1,5 and 2,1 A current limiting options and a choice of active-high and active-low enable, the switch optimises port protection in a host of different systems.

The power switches include an internal sensing FET, which monitors for over-current conditions without increasing series resistance in the current path and an over-temperature sensor. If either over-current or over-temperature conditions are sensed, then the device switches into its current limiting mode. To prevent unwanted tripping when a high capacity load is connected to the device output, a 7 ms deglitch timeout has also been included in the AP21XX’s design.

The USB power switch family is provided in small footprint SOT25, SOP-8L and MSOP-8L-EP packages. Device operating temperature range is from -40°C to

85°C.

Further reading:

EMI shielding materials application guide
Circuit & System Protection
TE Connectivity’s shielding solutions include electrically conductive elastomers, gaskets, knitted wire mesh, oriented wire, EMI shielding ventilation panels, shielded window, cable shielding and shielding components.

Read more...

---

Clearing the Static: ESD containers and packaging
Actum Circuit & System Protection
         Vacuum forming ESD Electronic components can be damaged by electrostatic discharges. To protect against such damage, electronic assembly parts are often transported or stored in vacuum formed component ...

Read more...

---

Electrostatic discharge chairs
Actum Circuit & System Protection
An ESD chair forms an integral part of grounding within the electrostatic discharge protected area to prevent potential damage to products.

Read more...

---

Conductive ESD footwear
Actum Circuit & System Protection
Conductive ESD footwear is used in conjunction with other grounding devices, such as a wrist strap, cord, and ESD surface mats, to provide a continuous path to ground.

Read more...

---

Clearing the Static: The importance of cleaning in ESD control
Actum Circuit & System Protection
To prevent Electrostatic Discharge (ESD) damage to sensitive electronic assemblies and components, all production, handling, packaging, and storage must take place in an ESD-protected environment.

Read more...

---

Clearing the Static: Staying grounded
Actum Circuit & System Protection
To maintain reliable electrostatic discharge control, regular testing and accurate measurement are essential, with grounding products and ESD testing equipment being vital.

Read more...

---

Smarter protection without disruption
NewElec Pretoria Circuit & System Protection
Designed for operations still running without integrated automation, NewElec’s retrofit-friendly systems let you upgrade performance and safety without overhauling your entire network.

Read more...

---

Circuit breaker for reliable, compliant protection
RS South Africa Circuit & System Protection
Legrand’s low-voltage power distribution portfolio encompasses the DX3 range of miniature circuit breakers, designed to deliver dependable protection in residential, commercial and industrial installations.

Read more...

---

Reducing noise on power supply lines
Future Electronics Circuit & System Protection
Murata has introduced the EMIFIL ESD Series Noise Filters, a breakthrough solution engineered for superior noise suppression and enhanced electrostatic discharge (ESD) protection.

Read more...

---

Clearing the Static: Fundamental principles of static control
Actum Circuit & System Protection
Controlling electrostatic discharge in electronics manufacturing is essential with effective ESD programs built on six key principles.

Read more...

---