Linear Regulator or DC/DC Converter
When discussing the power supply configuration of the machine, are you worried about using a linear voltage regulator or a DC/DC converter? When the operating voltage of the LSI drops, operating at 1.8V or 1.2V operation, such as when a linear voltage regulator is used for driving from a 5V line or a lithium ion battery, a large amount of heat loss will occur, and energy efficiency cannot be effectively used. It is well known that in this case, if a step-down DC/DC converter is used, the voltage can be converted with high efficiency. However, if DC/DC converters are used, there will be many “such as “noise generationâ€, “more external components and higher costs,†“the procedure for setting fixed numbers†and so on due to “necessary matters at the time of useâ€. Impede the use of opinions.
In this investigation record, through explaining the working condition of TOREX DC/DC converter XC9235/XC9236/XC9237, understand the basic characteristic and working principle of DC/DC converter. In addition, the XC9235/XC9236/XC9237 series has a small number of external components and is an integral, centralized DC/DC converter that does not require adjustment. Its specialty is to meet both low noise and improved power conversion efficiency. It is an application and wireless device. Other popular ICs.
Features of Step-Down Converter XC9235/XC9236/XC9237
Recently, there have been many products that simply achieve the purpose of work by adding a coil and a capacitor to a step-down DC/DC converter with few external components. This is because it is possible to obtain a high-efficiency power supply simply by adding only one coil that is also smaller than the LDO voltage regulator to constitute a component.
XC9235/XC9236/XC9237 Series
Terex Semiconductor's XC9235/XC9236/XC9237 family includes a step-down synchronous rectification DC/DC converter with P-channel MOSFET and N-channel MOSFET output current drivers.
The internal IC determines the number of circuits required for stable operation. The external components only require the input and output capacitors and coils described in the product catalog to operate. It is an integrated DC/DC converter. Can provide up to 600mA output current. (Refer to Figure 1)
figure 1. XC9235/36A, B, C, E, G (3 MHz product)
This type of IC has different control modes depending on the model. The XC9235 is a PWM operation, the XC9236 is a PWM/PFM automatic conversion operation, and the XC9237 is equipped with an additional manual signal to fix the PWM operation function, in addition to the PWM/PFM automatic conversion operation. product. It is equipped with two kinds of switching frequency of 1.2MHz and 3MHz. You can select 1.2MHz if you want to focus on the energy conversion rate, and choose a 3MHz product that is smaller than the coil size if you prefer miniaturization. In addition, there are optional rich features and features that can correspond to a variety of different uses. The high-speed soft-start and CL discharge functions enable rapid rise and fall at turn-on and turn-off, allowing easy setup of the combined power supply sequence.
Table 1: Selection Table for XC9235/XC9236/XC9237
Provides SOT-25 and USP-6C (2.0 mm × 1.8 mm, t = 0.6 mm MAX), USP-6EL (2.0 mm × 1.8 mm, t = 0.4 mm MAX), WLP-5-03 (1.26 mm × 1.06 Mm, t=0.4mm) package.
Photo 1: Package Photo
Photo 2: Mounting Board Photo
figure 2. Internal block diagram of the XC9235/XC9236/XC9237
The internal circuit consists of the reference voltage, error amplifier, oscillator, indicator waveform, PWM comparator, UVLO, current limiting circuit, etc. The fixed output voltage type is fixed by laser trimming to adjust the resistance ratio of internal resistance R1/R2. Operating voltage range is between 1.8V and 6V. In addition, the phase compensation, transmission frequency, and soft-start time of the amplifier are adjusted internally and can be used without any adjustment.
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