Compact, Lightweight & High-Efficiency: Dynamic Power Sources Reference Solution from Hynetek
8 15, 2025
The USB-IF's ECN for the USB Power Delivery Specification Revision 3.2 introduces the concept of DPS (Dynamic Power Sources). This ECR introduces a new type of power source known as a dynamic power source. A dynamic power source is a single-port or multi-port device capable of providing additional power for a limited period of time, with the duration depending on specific conditions (e.g., sufficiently low ambient temperature, device temperature, etc.). For manufacturers and customers, such power sources enable faster charging capabilities with smaller, lighter designs.
Differences between ordinary power supplies and DPS power supplies
During charging, the device only requires maximum power for a short period of time. For most of the charging time, the power drawn by the device does not reach the maximum power of a standard power supply. Standard power supplies waste resources during most of the charging time, while power supplies that support DPS functionality can save resources.
Basic Working Mode of DPS
The charger provides higher power within a limited time period based on a series of specific conditions, while providing a lower minimum power indefinitely. (Port Maximum PDP refers to the maximum power that can be provided, which may only last for a short period of time.)
When the charger can no longer provide higher power, it dynamically switches to providing lower minimum power. (The Port Present PDP dynamically changes when power is limited but never falls below the minimum power.)
DPS Reference Solution from Hynetek
The DPS power supply demo board based on HUSB363 is shown in the figure below. It can achieve a maximum power of 60W and a DPS power of 40W.
Maximum power 60W：
FPDO1-4: 5V3A, 9V3A,15V3A, 20V3A
PPS: 5-16V3A
AVS1: 9-15V3A
AVS2: 15-20V3A
DPS power 40W：
FPDO1-4: 5V3A, 9V3A,15V2.67A, 20V2A
PPS: 5-16V2.65A
AVS1: 9-15V2.67A
AVS2: 15-20V2A
As shown in the figure below, the DPS power supply demo board using HUSB363 from HuiNengTai and a 100K adjustable resistor are used to conveniently adjust the OTP pin level and quickly achieve the power switching conditions.
When the charger is connected and the voltage at the HUSB363-OTP pin reaches the specified condition, a 1-minute timer is activated to complete the power reduction process. Figure 2 shows the state before power reduction, and Figure 3 shows the state after power reduction.
Figure 2: 60W before power reduction
Figure 3: 40W after power reduction
When the charger is connected and the voltage at the HUSB363-OTP pin reaches the specified condition, a 1-minute timer is activated to complete power restoration. Figure 4 shows the state before power restoration, and Figure 5 shows the state after power restoration.
Figure 4: 40W Before Power Recovery
Figure 5: 60W after power restoration
When the charger is connected, broadcast high power. When the voltage of the HUSB363-OTP pin reaches the specified condition, the HUSB363 removes the spoofing device and reconnects. The PDO will quickly broadcast low power without waiting for 1 minute.
Figure 6: 60W before Power reduction
Figure 7: 40W after power reduction
When the charger is connected, broadcast low power. When the voltage of the HUSB363-OTP pin reaches the condition, HUSB363 removes the spoofing device, reconnects, and PDO quickly broadcasts high power without waiting for 1 minute.
Figure 8: 40W After Power Reduction
Figure 9: Restore to 60W power
