负载降低 meaning in English

load decrease
load decrement
load drop

The switch power will operate at ccm condition when circuit is set to pwm mode . when pfm mode is selected for the operation mode , the switch power will still operate at pwm condition with the high load , the system will cancel the pwm mode and enter the pfm mode only when the load is drop to a certain threshold to boost the operation efficiency at light load , make the ic has high efficiency within wide load range
选择pwm模式,开关电源将工作在ccm模式下;选择pfm模式,在负载较高的情况下,开关电源仍然工作于pwm模式,只有当负载降低到一定程度时,开关电源才退出pwm模式,而按照pfm工作模式操作,跨过一部分时钟周期,降低频率相关功耗,以提高轻负载时低效率的问题,使得开关电源在很宽的负载范围内都具有高效率。