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在手机电路中,SWDC 指未调整电压,即通过开关后的电池电压。VBATT 指电池电压。开关接通时,未调整电压(SWDC)等于电池电压(VBATT);开关断开时,SWDC 等于 OV。例如,爱立信 GF768/788型手机稳压电路采用5脚封装的直接稳压模块,与采用电源模块加扩流管的稳压方法不同,它需设独立的开关来控制 SWDC 的有无。该开关系8脚 TSOP封装的场效应开关管 U520,其第②、③脚为电池电压输入端,第④脚为未调整电压的输出端,第①脚为开
In the mobile phone circuit, SWDC refers to the unregulated voltage, which is the battery voltage after the switch. VBATT refers to the battery voltage. When the switch is on, the unadjusted voltage (SWDC) equals the battery voltage (VBATT); when the switch is off, SWDC equals OV. For example, Ericsson GF768 / 788-type cell phone voltage regulator circuit using 5-pin package of direct voltage regulator module, and the use of power modules plus the regulation of the diffuser is different, it needs to set up a separate switch to control the presence of SWDC. The switch is 8-pin TSOP package FET field effect switch U520, the first ②, ③ feet for the battery voltage input, the fourth pin is the output voltage is not adjusted, ① feet open