No, you can’t. The original 19V power supply has an output range of 16 to 22V and does not charge at low power. It will use the built-in battery until the battery runs out. To stabilize the input range, the laptop has a built-in voltage regulator module.
After 19V step-down 12V for fan, display, hard drive step-down 5V, USB, camera and keyboard step-down 3.3v, and chip step-down 1.2v.
As different models of the same brand use other battery specifications, the voltage range of the laptop’s internal power management module is also diverse. If you use a 12V power supply, the results are uncertain.
1. This laptop is powered by a battery; different brands have different models. For example, HP for 10.8v, Dell, Lenovo, and other domestic computers for 11.1v, some for 10.8v, while Apple’s battery voltage of 7.3v.
2. In practice, Apple uses a 12V power supply, which can work properly. And those Windows’ system requirements of the book, few can also work correctly, that is, its power management module voltage adaptation range is vast.
3. This problem can also be seen in the power adapter parameters attached to the book. For the Windows adapter, the output DC parameter is 19V or 19.5V or 20V, while the apple adapter is 14.5V.
4. Whether the book can use 12V external power depends on the design parameters of the internal power management module. The module to the external input voltage, secondary voltage regulation process, the output master needs each group of working voltage, the input voltage must be greater than the output voltage, the circuit can work properly.
Other battery specifications
As different brands of models use other battery specifications, the voltage adaptation range of the internal power management module of the notebook is also diverse, using a 12V power supply, the results are uncertain—specific reasons.
1.the notebook battery power supply, different brands or models, are also different. Such as HP notebooks for 10.8V, DELL, Lenovo, and other domestic machines for 11.1V, and some for 10.8V, while the Apple book battery voltage of 7.3V.
2.in practice, the Mac using a 12V power supply is entirely normal to work. And those Windows’ system notebooks, a tiny part, can also work correctly. That is, its power management module voltage adaptation range is wide.
3.this issue can also be seen from the parameters of the power adapter attached to the book. Such as the Windows book power adapter, the output DC parameters of 19V, or 19.5V, or 20V, while the Apple book is 14.5V.
4.this book can use 12V external power conditions, depending on the internal power management module design parameters. The module to the external input voltage, to be secondary voltage regulator processing, the output motherboard needs the working voltage of each group. Therefore, the input voltage must be greater than the output voltage, a particular amplitude value, for the voltage regulator circuit to work correctly—obviously, the Apple book meets this condition.