mm1548 Mitsumi Electronics, Corp., mm1548 Datasheet - Page 10

• Manufacturer Part Number: mm1548
• Description: Secondary-side Control For Energy-saving Ac Adaptor
• Manufacturer: Mitsumi Electronics, Corp.

MITSUMI
Timing Chart
(secondary side output)
(load det. + constant
CS terminal
(constant current
control input)
(secondary side output)
(load det. + constant
V
PO1 current
voltage control output)
Primary side switching
V
PO1 current
voltage control output)
Primary side switching
Constant voltage control
Constant current control
CC
CC
1
4
1
4
5
3
3
, OUT PIN
, OUT PIN
Normal mode [Io>115mV / R
Normal control [V
2
2
AC input
114.4mV
Rectifying
circuit
0mA
0mV
OFF
5.1V
4.9V
0mA
OFF
ON
ON
2V
0V
0V
CC
>2.0V]
Switching
interruption
control
Signal detection
circuit
Delay circuit
L
S]
200mV
Normal mode
Switching
circuit
4
V
Secondary-side Control for Energy-Saving AC Adaptor MM1548
CC
OUT
OUT
34mV
5.1V
4.9V
3.5V
0mA
OFF
Photocoupler
Smoothing
circuit
0mA
0mV
ON
OFF
ON
0V
2V
0V
Energy saving mode [Io<115mV / R
Drop control [V
Energy saving mode
1
PO1 GND
V
CC
over 0.6V
Normal mode
MM1548
CC
CNT OUT
R
3
L
<2.0V]
S
RCS
Energy saving mode
CS
OUT
V
V
CC
2
CC
OUT
5
Normal mode
output
+
–
L
S]