MB39A119 Fujitsu, MB39A119 Datasheet - Page 18

• Manufacturer Part Number: MB39A119
• Description: DC/DC Converter IC
• Manufacturer: Fujitsu

18
MB39A119
3. Detection Functions
(1) AC adapter voltage detection block (AC Comp.)
(2) Constant voltage control state detection block (CV Comp.)
When ACIN terminal (pin 4) voltage is lower than 2.0 V (Typ) , AC adapter voltage detection block (AC Comp.)
outputs “Hi-Z” level to the ACOK terminal (pin 5) and outputs “L” level to the XACOK terminal (pin 22) . When
CTL terminal (pin 21) is set to “L” level, ACOK terminal (pin 5) and XACOK terminal (pin 22) are fixed to “Hi-Z” level.
AC adapter detection function table
The logic of the following terminal is fixed according to the connection state of the AC adapter.
When CV Comp. detects that the FB123 terminal (pin 14) voltage of the error amplifier (Error Amp3) output
terminal becomes 2.6 V (Typ) or less, “L” level is output to constant voltage control state detection block output
terminal CVM terminal (pin 6) .
Charge control state function table
Error Amp3 output
(FB123)
> 2.6 V
≤ 2.6 V
ACIN
H
L
ACOK
CVM
Hi-Z
Hi-Z
L
L
Constant voltage control
Constant current control
XACOK
Status
Hi-Z
L