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The difference of USB Power Delivery power supply types

The difference of USB Power Delivery power supply types

Kieran_Pan
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Question

What is the difference of USB Power Delivery power supply types? 

Answer

Based on Type-C Power Delivery specification, there are five difference Power Data Objects (PDOs) for demonstrating USB PD power supply types:

PDO

Description

Fixed Supply PDO

Fixed Supply PDO voltage have to 5V, 9V, 15V, 20V, 28V, 36V, and 48V. Current limits to rang of 0A – 5A. Source shall support at least one fixed supply PDO which have the capability of operating at 5V.

Variable Supply(no-Battery) PDO

Variable Supply (non-Battery) PDO represents that very poorly regulated sources. The absolute voltage, including any voltage variation, shall not fall below the minimum voltage and shall not exceed the maximum voltage. The minimum voltage shall not be less than 80% of the maximum voltage.

Battery Supply PDO

Battery Supply PDO represents that batteries can be connected directly as a source to VBUS. Maximum and minimum voltage in 50mV units and the maximum allowable power in 250mW units in Battery Supply PDO Message.

SPR PPS

(Programmable Power Supply) 

APDO

The PPS APDO represents a source whose output can be programmatically controlled in the advertised voltage range. It has a programmable output current fold back. The output voltage range is adjustable in 20mV steps. Voltage range is 3.3V - 21V. Current limits to rang of 0A – 5A.

EPR AVS

(Adjustable Voltage Supply)

APDO

EPR AVS APDO doesn’t support current limit. AVS APDO is limited by the power. It can set that power PD POWER(PDP) in the the capabilities message. The output voltage range is adjustable in 100mV steps. Voltage range is 15V - 48V. 

 

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