The main types of power management chips and application of Laptop battery
If the design of the circuit require a high power supply noise and ripple rejection, require the occupier PCB board space is small (such as mobile phones and other handheld electronic products), the circuit does not allow the use of the power inductors (such as mobile phones), power supply needs to have instantaneous calibration and output state self-test feature that requires a voltage regulator voltage drop and its own low power consumption, low cost, and program a simple line, then the linear power supply is the most appropriate choice. This power includes the following technologies nikon d3000 vertical-grip: precision voltage reference, high performance, low-noise op amp, low dropout Regulator, low quiescent current. In the low power supply, the negative op amp power supply, LCD / LED driver and so on, often use chips based on capacitive switching power supply, which is commonly referred to as charge pump (ChargePump).
Chip charge pump works based on many products, such as the AAT3113. This is a general low-noise, constant frequency charge pump DC / DC converters consisting of white LED driver chips. AAT3113 uses scores of times (1.5 ×) conversion to increase efficiency. The device driver 4-way parallel mode LED. Input voltage range of 2.7V ~ 5.5V, output for each provide nikon d5000 vertical-grip about 20mA of current. The device also features a thermal management system features in order to protect any shorted output pins arising. The embedded soft-start circuitry prevents current overshoot at startup. AAT3113 using simple serial control interface to the chip enable, shutdown and 32 pairs of the number of scale brightness control.
The inductor-based DC / DC chip, the most extensive range of applications, applications, including handheld computers, cameras, spare batteries, portable instruments, micro-phones, motor speed control, display bias and color adjustments, etc.. The main technologies include: BOOST structure of current-mode loopnikon mb-d10 vertical-grip stability analysis, BUCK structure of voltage-mode loop stability analysis, BUCK structure of current-mode loop stability analysis, over-current, over temperature, over-voltage and soft-start protection, synchronous rectifying technical analysis, technical analysis of the reference voltage.
In addition to the basic power conversion chip, power management chip also includes the rational use of power for the purpose of power control electronic devices. NiH battery fast charging, such as smart chips, lithium-ion battery charge and discharge management chip, lithium-ion battery over-voltage, over current, over temperature, short circuit protection chip; the line between the power supply and backup battery management chip switch, USB power supply management chip fujitsu lifebook b6110d battery; charge pump, multi-channel LDO power supply, power-up sequence control, a variety of protection, battery charge and discharge the complex power management chips. At present, many products are moving in that direction, because the application of such products more widely, especially in consumer electronics.
Such as portable DVD, mobile phones, digital cameras and so on, almost with a -2 blocks of power management chip will be able to provide sophisticated multi-channel power supply fujitus fpcbp112, fujitus fpcbp112ap, so that the performance of the system to play to the best.
Analog chip digital power supply to make up deficiency of electronic devices with more functions, higher performance, its structure, technology, systems more complex, traditional analog technologies to meet the overall system power management IC power management requirements more difficult it is, the price is also more expensive. High-performance full-digital control IC is the field of intelligent power management trends, there is a flexible, rapid response, highly fujitsu lifebook e8310 battery integrated and highly controllable great advantage. Only a few established the current global semiconductor manufacturers, as well as the first new IC vendor into this new arena.
TI, Microchip, ZilkerLabs, iWatt, SiliconLabs and other companies put out their own digital power products. Digital controller core mainly consists of three specific modules: anti-aliasing (anti-aliasing) filters, ADC (ADC) and digital pulse width modulator (DPWM). In order to achieve the same analog control framework for performance indicators must be equipped with high-resolution, high-speed and linear ADC, as well as high-resolution fujitsu lifeBook s2210 Battery, high-speed PWM circuit design.
ADC resolution, must be able to meet the error is less than the output voltage to allow changes in the scope, the smaller the required output voltage ripple, then the higher requirements on the ADC resolution. At the same time, due to anti-aliasing filter, as well as pipeline-type or SAR ADC will introduce the loop delay, so we urgently need a high sampling rate of the ADC. Analog controller pulse width may be generated by the inherent limitations fujitsu lifeBook s6310 Battery, while the DPWM can generate discrete and limited set of PWM width.
The output from the steady state point of view, can only be a set of discrete output voltage. As the DPWM is part of the feedback loop, so the resolution of DPWM must be high enough in order to make the output does not display the value of a well-known limits of weeks. Do not show any minimum required limits of weeks the median value is determined by topology, the output voltage and the ADC resolution. At the same time, the system loop stability by the PI or PID controller to adjust. Compared with the structure of fujitsu lifeBook s6311 Battery the current analog control, digital control architecture, the cost will increase significantly.
