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参数资料
| 型号： | MM1548N |
| 厂商： | MITSUMI ELECTRIC CO LTD |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | SOT-26, 6 PIN |
| 文件页数： | 10/12页 |
| 文件大小： | 128K |
| 代理商： | MM1548N |
MITSUMI
Secondary Control for Energy-Saving AC Adaptor MM1548
1. Operation of Blocks
1.1 Input/output difference control
In the normal mode that a load current is detected and the system supplies the load current through the
Supply Transistor (PNP type), MM1548 controls CNT current flowing into the base of Supply Transistor to
keep the differential voltage between VCC and OUT (Vce of Supply Transistor) at 200mV.
1.2 Load current detection and Energy saving current detection
When load current increases in energy saving mode and the differential voltage between VCC and OUT
exceeds
VLSP1 (200mV), MM1548 changes to the normal mode, PO1 switches from open to low mode,
and the photocoupler PC1turns on. As a result, the system switches primary-side switching operation to
normal mode from disabled.
The switching voltage has following hysteresis if load current is increasing (
VLSP1) or decreasing
(
VLSP2).
( hysteresis:
VLSP1 = 200mV < >
VLSP2 = 115mV)
When the differential voltage between VCC and OUT falls to
VLSP2 (115mV), MM1548 changes to the
energy saving mode, and the photocoupler-turn-off circuit switches compulsory photocoupler current to
zero under the condition that load current is decreasing in normal mode and Vcc = 4.6V or more.
1.3 Voltage drop detection
When VCC voltage falls to 4.6V in the energy saving mode, MM1548 stops the photocoupler-turn-off circuit
operation to save consumption current of MM1548.
When VCC voltage falls to 3.5V in the energy saving mode, MM1548 changes to the normal mode.
As a result, Out voltage (output of secondary side) swings intermittent between 4.9V and 3.5V.
1.4 Constant current control
When load current is increasing in the normal mode, and the differential voltage between CS and GND
exceeds VCS1(114.4mV typ.), PO1 switches from open to low mode, and the photocoupler PC1 turns on. As
a result, MM1548 changes to the CC(constant current) mode, and the load current is controlled that CS
voltage keeps VCS1.
1.5 Constant voltage control
When MM1548 is in normal mode and isn't in constant current mode, it is in CV(constant voltage) mode,
and PO1 current is controlled that VCC voltage keeps 5.1V (equal to internal 1.25V: REF voltage).
Voltage between VCC and OUT(200mV)
RLS
470
RLB
100
Supply transistor
CNT
Load current
VCC
200mV
115mV
Energy saving mode
Normal mode
Input/output difference control
Load current detection
Energy saving current detection
PO1 drive
PO1 drive(Load 5k
)
Photocoupler PC1 control
PO1
OUT
PC1
Output
(
–)
GND
RCS
CS
0.22
Load
(
+)
Voltage drop detection
(V=4.6V)
Voltage drop detection
(VCC=3.5V)
Constant voltage control
(VCC=5.1V)
Constant current control
(CS=114.4mV)
(Io=520mA)
ROS1
ROS2
REF
Overvoltage
detection
(VCC
, OUT=7V)
Energy saving mode control
(3.5V :ON
, 5.1V :OFF)
Photocoupler-turn-off(4.6V )
Operation
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