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Charging detector constructed using the Universal USB charger for iphone

Categories: Company NewsStars: 3StarsVisit: -Release time: 2013-07-03 18:54:00
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 As the number of consumers to buy portable devices increases, they are also a variety of non-standard connectors with many power adapter bound. To solve this problem, the mini-USB port for battery charging and data transmission standards. MAX14578AE/MAX14578E charging overvoltage detector and limit switches greatly simplify the design of micro-USB port, so that the end-user operations easier.

 
Electrical characteristics and protective measures
 
For some AC - DC power benchmarks show poor line regulation performance, while in the presence of optocoupler feedback (switch charger for iphone) loss worse case, the output voltage may be increased to 20V.
 
Through the front of the device design overvoltage protection (OVP) device, and the host is not responsible surge effect phenomenon can be eliminated.
In order to meet China's new charging standard covering most application requirements, ON Semiconductor offers a variety of different OVLO models. OVP + OCP OVP or its version can provide μDFN and TSOP5 two different packages, the latter solution cost and thermal performance has compromised performance.
 
However, users can also connect peripherals to built-in lithium ion battery (Figure 1 wall adapter section), then use the wall adapter on the market for sale. In this case, only Vbus pin and GND are connected, while the D + and D-are shorted.
 
According to this the quality and complexity of the adapter, the output voltage may occur much more than a small portable products currently manufactured sensitive electronic components required for maximum rating of output transient phenomenon.
 
For some AC - DC power benchmarks show poor line regulation performance, while in the presence of optocoupler feedback (switch charger for iphone) loss worse case, the output voltage may be increased to 20V.
 
Through the front of the device design overvoltage protection (OVP) device, and the host is not responsible surge effect phenomenon can be eliminated.
 
The downstream system via a USB connection can be various types of host power supply.
 
Connecting a personal computer (PC) and other standard USB source device, the connector will contain Vbus power terminals and data terminals (D + and D-). Vbus voltage value defined by the USB specification: Rated voltage of 5V, up to 5.25V. In fact, the longer the cable series inductance due ringing. The maximum number of rings ripple voltage depends on the mobile device input capacitance and parasitic inductance. Aftermarket non-original accessories tend to have lower performance, the cable will have a higher parasitic parameters of these factors on the connected peripherals may cause potential harm.
 
Typically Vbus pin is connected to the transceiver power input pin (sometimes through the maximum rated voltage of the LDO 6V to connect), the Vbus power lithium-ion battery for charging (in most cases the maximum rated voltage of 7V or 10V) can be connected to a charger for iphone input pin.
 
However, users can also connect peripherals to built-in lithium ion battery (Figure 1 wall adapter section), then use the wall adapter on the market for sale. In this case, only Vbus pin and GND are connected, while the D + and D-are shorted.
 
According to this the quality and complexity of the adapter, the output voltage may occur much more than a small portable products currently manufactured sensitive electronic components required for maximum rating of output transient phenomenon.
 
How to design
 
USB current capability in normal mode is 100mA (not configured mode), while in configuration mode up to 500mA. To save power, in the absence of data traffic will enter the USB suspend mode. When the device is in suspend mode, and it is bus-powered, then the device will not be taken from the bus more than 500μA of current. A host can send resume command or remote wakeup command to activate another standby host. Above points show that the OVP circuit needed to meet requirements of different indicators, such as current capacity, cooling, undervoltage and overvoltage protection and quiescent current consumption.
 
Protect the power supply via the USB connector and charger for iphone pc security
 
Today, most electronic devices have a USB connector, they exchange data via USB and / or charge the battery for portable devices. While USB communication protocol that has been quite popular, but when the target application needs to power the device via a USB connection, you must pay attention to some safety precautions.
How to design
 
USB current capability in normal mode is 100mA (not configured mode), while in configuration mode up to 500mA. To save power, in the absence of data traffic will enter the USB suspend mode. When the device is in suspend mode, and it is bus-powered, then the device will not be taken from the bus more than 500μA of current. A host can send resume command or remote wakeup command to activate another standby host. Above points show that the OVP circuit needed to meet requirements of different indicators, such as current capacity, cooling, undervoltage and overvoltage protection and quiescent current consumption.
 
Non-standard charger for iphone-wasting and cumbersome
 
Connecting a personal computer (PC) and other standard USB source device, the connector will contain Vbus power terminals and data terminals (D + and D-). Vbus voltage value defined by the USB specification: Rated voltage of 5V, up to 5.25V. In fact, the longer the cable series inductance due ringing. The maximum number of rings ripple voltage depends on the mobile device input capacitance and parasitic inductance. Aftermarket non-original accessories tend to have lower performance, the cable will have a higher parasitic parameters of these factors on the connected peripherals may cause potential harm.
 
Typically Vbus pin is connected to the transceiver power input pin (sometimes through the maximum rated voltage of the LDO 6V to connect), the Vbus power lithium-ion battery for charging (in most cases the maximum rated voltage of 7V or 10V) can be connected to a charger for iphone input pin.
Even if there Vusb or wall adapter fast output rise (hot-plug), the device is not observed at Vout voltage spikes, thanks 4ms soft-start control. This protection can be the most critical feature is the fastest speed of any overvoltage condition is detected, then the internal FET open.
 
OVP device off time count starts from the break OVLO threshold to Vout pin down so far. NCP360 Although the current consumption is very low, but with a fast closing time.
 
Typical 700ns / max 1.5μs off time makes the device class devices on the market today.
 
In order to provide a higher level of protection, these devices can be added to over-current protection (OCP) feature. By providing this additional function modules, the charging current or the load current does not exceed the device within the programmed limit. To comply with the USB specification, but it may be as high transient current 550mA
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