Better 5V1.5A step-down module than 1117

Introduction

There is nothing unique in the design of this module. You can use it very easily. It is more often used to verify the characteristics of the 1086 chip. See the verification results below.

Reverse output test

Through 12V reverse input, 11.4V voltage is obtained on the normal input port. The reverse input within 1 minute does not affect the function of the chip.

Temperature test

Like most buck chips, the voltage gap between the input and output terminals has a direct impact on heat generation (the following test is at room temperature of 25 degrees Celsius)

At 12V, the heat is 50 degrees at 0.1A

At 8.4V, 1A, the temperature is stable at about 92 degrees, and the overheat protection is about 100 degrees.

Power Efficiency

It mainly measures the output efficiency at two commonly used voltages: 8.4V (powered by two lithium batteries) and 11.4V (powered by three lithium batteries with 50% capacity). At 8.4V, the current of this chip is consistent with the output current, and the voltage The larger the gap, the greater the heat, so it is not very suitable for use above 10V and above 0.5A.

The 5V voltage stabilization threshold is 6.4V. Below this voltage, 5V cannot be stabilized. Adding a heat sink can improve heat dissipation, but it still cannot alleviate overheating when the voltage is above 10V.

Summarize

The 1086 buck chip is much better than the AMS1117, but because it is still a triode, its performance at higher voltages is still limited, and it will perform better within 10V.