Over-voltage protection for USB charging

6 August 2008 Circuit & System Protection

ON Semiconductor has introduced the NCP361 – an integrated over-voltage protector dedicated to USB charging applications for portable and consumer devices, such as cellphones and MP3 players, set-top boxes and computers.

The NCP361 uses an internal P-channel FET, making an external device unnecessary and thus reducing the system cost and the printed circuit board area of the application board. If over-voltage from a wall adapter occurs, causing the input voltage to exceed the over-voltage threshold, the device instantaneously disconnects the output from the input to protect the downstream system for optimal protection. It offers low quiescent current and very low current consumption at 20 μA.

For added protection, the NCP361 features over-current protection at 750 mA. It has a negative-going flag output which alerts the system that a fault has occurred. The enable pin allows this overvoltage protection (OVP) device to be forced to an off-state. It also offers protection of VBUS up to +20 V, a more precise voltage threshold than discrete zener-based devices.

Further reading:

Clearing the Static: Key principles of ESD control in electronics manufacturing
Actum Electronics Circuit & System Protection
Effectively managing electrostatic discharge is essential in electronics manufacturing to ensure not only product reliability, but also worker safety.

Read more...

---

Clearing the Static: Three steps for a dry ESD packaging system
Actum Electronics Circuit & System Protection
For optimal storage, it’s essential to complete the dry-packaging system by adding Desiccant Packs and Humidity Indicator Cards.

Read more...

---

Ensuring safety with earth leakage protection
NewElec Pretoria Circuit & System Protection
Earth leakage protection helps mitigate the risks of electric shocks, fires, and equipment damage by swiftly identifying faults and disconnecting the power supply, thus safeguarding both human lives and machinery.

Read more...

---

Suppressing EMI with filters
Vepac Electronics Circuit & System Protection
EMI/RFI filters play an important role in reducing the high-frequency noise that is generated by various electrical and electronic devices.

Read more...

---

Patch attenuates like a shielding cabinet
Würth Elektronik eiSos Circuit & System Protection
Würth Elektronik has launched its hybrid WE-EMIP EMI absorber sheet, a convenient solution for reducing electromagnetic interference by up to 40 dB.

Read more...

---

Clearing the Static: Ionisation equipment
Actum Electronics Circuit & System Protection
Electrostatic discharge (ESD) ionisation equipment is designed to neutralise static charges that accumulate on surfaces in environments where ESD-sensitive components or materials are handled. These ...

Read more...

---

Motor and feeder protection for LV and MV environments
NewElec Pretoria Circuit & System Protection
This relay from NewElec is a micro-controller-based precision instrument with ANSI protection elements, advanced control features, and switchgear controller logic integrating motor and feeder control functions.

Read more...

---

Clearing the Static: How to protect PCBs from electrostatic discharge and moisture
Actum Electronics Circuit & System Protection
Printed circuit boards (PCBs) are essential components in most electronic devices. They are sensitive to environmental factors like electrostatic discharge (ESD) and moisture, which can cause significant ...

Read more...

---

Clearing the Static: ESD chairs: Essential tools in controlled protected areas
Actum Electronics Circuit & System Protection
Static poses a significant risk in various industries, particularly those involving sensitive electronic components and equipment. To mitigate these risks, electrostatic discharge (ESD) chairs play ...

Read more...

---

Clearing the Static: ESD dissipative floor mats
Actum Electronics Circuit & System Protection
Dissipative floor mats are specialised mats designed to protect sensitive electronic equipment and components from electrostatic discharge (ESD), by quickly drawing the static electricity off workers before they touch such items.

Read more...

---