Active Decay Control

Active Decay Control

- High Speed response & Low Current Control -

Low Heat + Smooth Motor Rotation by Fast Decay Control

Time Optimization of Fast Decay mode reduces package heat generation. It is possible to reduce the number of substrate layers and down size the system due to low heat generation.

15 to 20°C lower than the competitors!

Competitor A/B

H-Bridge Operation Sequence

Since the Fast Decay mode is operated only when it is necessary, heat generation will be suppressed. Therefore the total cost can also be suppressed (4 layers → 2 layer board etc.).

Smooth Motor Rotation

Current ripple is suppressed by executing Fast Decay operation only when necessary, which will achieve smooth motor rotation.

Motor current is constantly monitored and Fast-decay mode is executed only when the current exceeds the target value. Low power consumption, less unevenness of the motor rotation and less vibration are achieved. The motor torque performance is improved with smooth rotation.

Current Control Image

Ripples of traditional type are not small because Fast Decay operation is executed periodically. Since Active Decay controls while maintaining responsiveness, ripples can be kept small.

Active Decay Control
Traditional Control

No External Parts, no individual motor setting

Require No External Parts for Decay Setting. Individual motor setting is not necessary.

Virtual CV (Constant Voltage)

[Feature] Long Battery Life and Constant Torque are achieved

Input voltage is always monitored and the duty of the internal PWM signal is adjusted automatically according to the power supply voltage.Even if the battery voltage drops, the torque is kept constant regardless of input fluctuation.

Automotive Qualified Product: AP1029ADR

Operating temperature range: -40 to 105°C,  Input voltage range: 5.5 to 32V

Short Brake

[Feature] Suppress Switching Noise and Reduce EMI

When switching the input signal, both of the low side MOSFETs are turned on for a certain time in order to regenerate the current, suppressing the noise of forward ⇔ reverse rotation switching and reducing EMI.