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Hello everyone, today we come to understand the Apple mainboard common power supplies

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There are five common power supply modes

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The first is called switching power supply

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This type of power supply usually uses the conduction and cutoff of MOS tube to control the on and off of a voltage

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For example, converting the standby voltage to the startup voltage

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However, some circuits are converted by power chips

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The second is called LDO power supply mode,

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also known as low voltage differential linear regulator power supply mode

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The power supply mode of LDO is usually step-down type

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For example, the 3.3V voltage is reduced to 1.5V, 1.0V, 1.8V to supply power to each other circuit

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However, the output current supplied by LDO is very small

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The third is PWM power supply

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This is the common power supply mode on the mainboard,

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but also has the highest failure rate

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In laptops, most are PWM circuits in the form of step-down,

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It can be a high voltage through the PWM after the step-down, increase the current,

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to meet the power of the CPU, graphics card or other circuit power supply needs

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The fourth is integrated power supply

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The integrated power supply is similar to Apple's main and secondary power chips

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It integrates PWM power supply mode, switch power supply mode and LDO power supply mode

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This is called integrated power supply mode

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The fifth is the four switch step-down, boost power supply circuit

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This mode of power supply is usually used to control the generation of a common point voltage,

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usually controlled by the charging chip

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Ok, these are the five common power supply modes in the mainboard