Wednesday, August 31, 2016

Pulse Frequency Modulation (PFM) DC to DC Boost Converter Circuit using A7530 from AiT Semiconductor Inc

Electronic Kit School. - There are many DC to DC step-up (boost) converter sold for us which can provide stable voltage and current output. Like when we want to get this device that can boost 1.5V from cell battery to 5V output, we can only buy it from online store like from Amazon or ebuy.

But in here, we will not give guidance on how to buy this converter from online store, but in here we will give you one circuit of Pulse Frequency Modulation (PFM) DC to DC Boost Converter Circuit using A7530 from AiT Semiconductor Inc like Figure 1 below. This circuit is surgery from the module that offered this time.

Circuit 

Figure 1. Pulse Frequency Modulation (PFM) DC to DC Boost Converter Circuit using A7530 from AiT Semiconductor Inc

Component Parts
  1. IC1: A7530
  2. C1: 100uF Tantalum
  3. C2: 47uF
  4. C3: 100uF/25V
  5. L1: 47uH
  6. D1: 1N5819
  7. R1: Load
Description

Circuit like in Figure 1 above show you about the Pulse Frequency Modulation (PFM) DC to DC Boost Converter Circuit using A7530 from AiT Semiconductor Inc that also can produce more than 3.3V output from 1.8V input. The main component used in this circuit is A7530 is served as the PFM step-up DC-DC converter. The converter can start up by supply voltage as low as 0.8V, and capable of delivering maximum 200mA output current at 3.3V output with 1.8V input Voltage. Quiescent current drawn from power source is as low as 20uA. All of these features make A7530 series be suitable for the portable devices, which are supplied by a single battery to four-cell batteries. 

How it works

Working of this minuscule DC-DC Boost converter module also like circuit in Figure 1 above is based on PFM (pulse frequency modulation) technique. According Electroschematics site describe that Pulse-Frequency Modulation (PFM) is a modulation method for representing an analog signal using only two levels (1 and 0). It is analogous to Pulse-Width Modulation (PWM), in which the magnitude of an analog signal is encoded in the duty cycle of a square wave. Unlike PWM, in which the width of square pulses is varied at constant frequency, PFM is accomplished using fixed-duration pulses and varying the repetition rate thereof.

A PFM converter is an alternative DC/DC power-converter architecture that uses a variable frequency clock to drive the power switches and transfer energy from the input to the output. Because the drive signal’s frequency is directly controlled to regulate the output voltage, this architecture is referred to as pulse-frequency modulation (PFM). DC/DC converters with constant-on-time or constant-off-time control are typical examples of the PFM architecture.

1 comments:

  1. Software apakah yang digunakan untuk menggambar rangkaian tersebut ? Apakah nama kode dari IC A7530 pada software tersebut ? mohon tanggapannya.

    ReplyDelete