公开(公告)号：EP1052758B1

公开(公告)日：2004-10-13

申请号：EP99830285.5

申请日：1999-05-10

Applicant: STMicroelectronics S.r.l.

Inventor： D'Arrigo, Angelo ,  Capici, Salvatore ,  Marino, Filippo ,  Pulvirenti, Francesco

IPC: H02J7/00

CPC classification number: H02J7/0068 ,  H02M3/156 ,  H02M2001/0009

公开(公告)号：EP1052758A1

公开(公告)日：2000-11-15

申请号：EP99830285.5

申请日：1999-05-10

Applicant: STMicroelectronics S.r.l.

Inventor： D'Arrigo, Angelo ,  Capici, Salvatore ,  Marino, Filippo ,  Pulvirenti, Francesco

IPC: H02J7/00

CPC classification number: H02J7/0068 ,  H02M3/156 ,  H02M2001/0009

Abstract: The frequency translator (72) is usable in a switching DC-DC converter of the type operating as a voltage regulator and as a battery charger. The frequency translator (72) receives at inputs a division voltage (VFB) proportional to a present value of the output voltage (VOUT) of the DC-DC converter (70), a reference voltage (VREF) correlated to a nominal value of the output voltage (VOUT), and a limiting signal (VL) indicative of a normal operation or of current limitation operation of the DC-DC converter (70), and supplies at an output (72u) a bias current (IBIAS) which is supplied to an input of an oscillator (32) supplying at an output a comparison signal (VC) presenting a periodic pattern with a frequency which is correlated to the bias current (IBIAS). In particular, the frequency translator (72) operates in a way such as to regulate a frequency translation of the comparison signal (VC) as a function of the difference between the division voltage (VFB) and the reference voltage (VREF) only when the DC-DC converter (70) is operating in the current limitation condition.

Abstract translation: 频率变换器（72）是在作为电压调节器和作为电池充电器操作的类型的开关型DC-DC转换器使用。 频率转换器（72）接收在输入的分压电压（VFB）正比于相关的一个标称值的输出电压的DC-DC转换器（70），参考电压（VREF）的（VOUT）的当前值 输出电压（VOUT）和一个限制信号（VL）表示在上输出（72U）的偏置电流（I BIAS）正常操作或DC-DC转换器（70）的电流限制手术，和用品的所有被提供 对在以输出供给振荡器（32）的输入呈现的周期性图案的频率的所有其相关于偏置电流（I BIAS）的比较信号（VC）。 特别地，所述频率变换器（72）进行操作的方式：例如，以调节所述比较信号（VC）作为分割电压（VFB）和参考电压（VREF）之间的差的函数的一个频率转换只有当 DC-DC转换器（70）在电流限制的条件下操作。