MB3875 Ver la hoja de datos (PDF) - Fujitsu

Número de pieza

componentes Descripción

Fabricante

MB3875

DC/DC Converter IC for Charging

Fujitsu 

MB3875/3877

s AC ADAPTER VOLTAGE DETECTION

With an external resistor connected to the +INE1 terminal, the IC enters the dynamically-controlled charging

mode to reduce the charge current to keep AC adapter power constant when the partial potential point A of the

AC adapter voltage (Vcc) becomes lower than the voltage at the -INE1 terminal.

AC adapter detected voltage setting Vth

Vth (V) = (R1 + R2) / R2 × − INE1

− INE1 setting voltage range : 1.176 V to 4.2 V (equivalent to 7 V to 25 V for Vcc)

−INE1

11

A

VCC

8

R1 +INE1

R2

<Error Amp.1>

−

+

s OPERATION TIMING DIAGRAM

Error Amp.2 FB2

Error Amp.3 FB3

Error Amp.1 FB1

OUT

AC adapter dynamically- Constant voltage

controlled charging

control

Constant current control

2.5 V

1.5 V

AC adapter dynamically-

controlled charging

16

Share Link: