PT8A3515BWEX

Series:	--
Part Status:	Obsolete
Applications:	Smart Iron Controller
Current - Supply:	400µA
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-10°C ~ 85°C (TA)

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PT8A3515BWEX Application Field and Working PrinciplePower management integrated circuits (PMICs) are vital components of modern electronic products due to their ability to convert and regulate power to different electronic components. A specific PMIC type is Specialized PMICs which offer features or serve itself as a separate ICs which enabling customers bring higher electricity efficiency with competing cost and size. PT8A3515BWEX, a dedicated one-channel Buck regulator, is one of the Specialized PMICs which is designed to help customers converting power or achieve lower power zone. This section discusses the application field, the working principle and structure of the PT8A3515BWEX along with its advantages, applications, some suggestions in operating the device and the summary. Application Field The PT8A3515BWEX is a single (one) channel integrated voltage regulator that is widely used for mobile phones, high brightness LED applications, wearable devices, Notebook, tablets and other battery-powered devices which need higher efficiency and longer battery lifetime. PT8A3515BWEX provides ultra-low power loss and high precision output voltage regulation. Its highly integrated integrated oil and gas platform greatly improve voltage regulation stability and impedance.Working principle The PT8A3515BWEX is a DC-DC regulator with a buck topology. Buck converters reduce input voltage (typically higher voltage) to an output voltage that is lower in magnitude to the input voltage. It works by manipulating input power to the output load substantially in both magnitude and frequency resulting in a regulated output voltage. In PT8A3515BWEX, the switching regulator adopts a pulse-width modulation (PWM) design to convert input voltage to regulated output voltage. Its frequency is determined by a clock circuit, in which the clock signal is generated by a Phase-Locked Loop (PLL) in the reference signal and the signal from the external clock as its inputs. During operation, the PLL will generate a signal with a frequency that is higher than the signal from the external clock and the signal will be converted to a square waveform using comparators. From then on, PT8A3515BWEX uses this square wave signal and PWM controlling technique to gradually change the output voltage until the designed output voltage is achieved. Structure The PT8A3515BWEX contains 4 blocks related to the power management integrated circuit including the power stage, control module, low dropout regulator (LDO) and voltage reference (VREF). The power stage manages the input voltage and output voltage conversion, where under the control of PWM, the output voltage is locked at the preset value. On the other hand, the control module access from a voltage reference and an external clock pulse to control the PWM signal. The low dropout regulator generates a reference voltage that is used to control the ON/OFF of power. From the reference voltage, a signal will be generated and sent to the power stage for controlling ON/OFF of the switch. The external clock will then adjusted the cycle of PWM, allowing synchronization between the power stage and control module to be achieved. Advantages The PF8A3515BWEX provides several advantages over digital power supplies with fixed frequency or analog controllers. Not only it reduce the total number of external components and board area, it also simplifies the design process with better performance, higher efficiency and higher precision. In addition, the PT8A3515BWEX power conversion enables a higher power factor, faster transient response, lower peak current and a high efficiency over a wide range of load currents. This is especially beneficial for applications where the power halving needs to be quick and fast. Applications PT8A3515BWEX is mostly used for a wide range of applications where precise power delivery is needed including imaging, industrial appliances, mobile phones, and HVAC systems.On the other hand, some laptop manufactures also uses the device to supply power for their notebook. PT8A3515BWEX is also adopted for LED dimming process and help supplying power for LED across a wide range of LED illumination saving energy and help saving cost. Suggestion in operating the device PT8A3515BWEX is quite easy and simple to operate - all you need to do is connect the source voltage, the ground and the output to your load and you are good to go. However, it is also important that when using the device, you take some suggestions into considerations. Firstly, you should always pay attention to the maximum temperature and the connected power dissipation. This will help you make sure that the device is working within the specified temperature range and it is safe to use. You should also pay attention to the maximum duty cycle and make sure that the designed duty cycle does not exceed the specified limit. Secondly, as the device is quite sensitive, it is necessary to pay attention to the EMI from other components and make sure that that does not have any negative effect to the device. Lastly, it is important to make sure that there are no voltage spikes and make sure that the device is well protected from such potential damage. Summary The PT8A3515BWEX is an integrated voltage regulator that provides ultra-low power loss and high precision output voltage regulation. This single-channel buck regulator is widely used for mobile phones, high brightness LED applications, wearable devices, Notebook, tablets and other battery-powered devices which need higher efficiency and longer battery lifetime. It works by manipulating input power to the output load substantially in both magnitude and frequency resulting in a regulated output voltage. The device is quite simple to operate and with suggested recommendations, it will be able to provide better performance and efficiency.

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