A 90V high-voltage high-end current detection chip - FP136 silkscreen BXXXX

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A 90V high-voltage high-end current detection chip - FP136 silkscreen BXXXX [Copy link]

Current detection technology is commonly used in scenarios such as high-voltage short-circuit protection, motor control, DC/DC converters, system power consumption management, secondary battery current management, battery management, and other current detection scenarios.

Today I would like to share with you a 90V high-end current detection chip with ultra-high voltage resistance - FP136, the silk screen is BXXXX .

FP136 Pinout

1. Features of FP136 current detection chip:

First of all, the advantages of FP136 are its high voltage resistance and wide common-mode input voltage: 3.3V to 90V, so that its application is very wide . It includes a differential input amplifier and a MOSFET with active output. With three external resistors, the track current signal is easily converted into an amplified voltage signal of the IC output pin. In addition, the gain can be adjusted by changing the value of these three external resistors.

FP136 Circuit

From the circuit diagram above, we know that it is a high-end current detection chip, because its sensing resistor is located above the load. We can know it clearly from the current sensing schematic diagram in the picture below.

Current sensing schematic

2. Principles and advantages of high-end current detection IC:

So how does the high-side current detection chip detect current specifically? Let's talk about its principle in detail. We know that low-side current measurement can usually use a traditional differential amplifier, which provides a simple and effective method for this type of measurement. On the other hand, there are some obvious disadvantages to low-side current measurement. The low-load sense resistor is located between the load and the ground, which prevents the load from being directly grounded. In addition, if the load is accidentally grounded, this configuration may result in dangerously high currents. High-side measurement eliminates these problems, allowing the load to maintain a direct connection to the ground while providing a method to detect high load currents caused by accidental short circuits . High-side current monitoring is particularly useful in battery-powered systems because it does not interfere with the ground path of the battery charger. However, high-side measurement brings additional requirements to device selection and operation. For this measurement configuration, the traditional method of using a differential amplifier is less efficient because there is a significant difference in the input resistance of the differential amplifier, and it is necessary to ensure that very matched resistors are used to obtain acceptable common-mode rejection ratios and other issues.

3. Advantages of FP136 current detection chip

The chip designed by Taiwan Yuanxiang Technology has solved the above problems. FP136 can detect the voltage drop of the shunt at a common mode voltage of 3.3V to 90V. At the same time, the current detection amplifier has a very low offset characteristic, which can achieve accurate measurement even at the lowest voltage level .

In addition, FP136 has improved a simple method to delay the conversion time. When a transient voltage occurs in the sensing resistor (RS), the integrated circuit will change the source current (IO) to the output terminal and produce a voltage change at the output terminal. The RC circuit will delay the output change for a period of time.

FP136 current detection chip

In addition, the impedance problem in the current detection circuit will affect the detection results. So how can this problem be solved?

Taiwan Yuanxiang's 90V high-end current detection chip - FP136 with ultra-high voltage resistance can solve this problem .

When a device is connected directly to the OUT pin, its impedance is connected in parallel with the gain setting resistor, RL. If the impedance of the device is lower, the parallel impedance combination will affect the gain of the system, resulting in an inaccurate output voltage.

Placing a buffer amplifier between the OUT pin and the device is a simple way to address the effects of impedance.

Application market display:

Other current detection chip part numbers for reference:

Shenzhen Yaxin Control Technology Co., Ltd. has been deeply involved in the chip industry for 20 years. It is the first-level agent of Feeling and MST in Shenzhen. It is committed to promoting and selling power management chips, LED driver chips and Hall switch series products, providing you with the most optimized solutions, the best quality products and consulting services.