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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： | 11/12页 |
| 文件大小： | 128K |
| 代理商： | MM1548N |
MITSUMI
Secondary Control for Energy-Saving AC Adaptor MM1548
1.6 Overvoltage detection
When VCC voltage or OUT voltage exceeds 7V (overvoltage), overvoltage detection circuit turn on.
As a result, PO1 sink current is controlled to turn on the photocoupler PC1, and system is protected from
overvoltage.
This circuit also detects negative voltage applied CS pin, and when it is detected, PO1 current is turned off
for overvoltage protection.
2. Design principles for each mode
AC adaptor output is controlled by following 4 mode under usage with MM1548.
Switching of each control mode is explained as follow.
2.1 for Output voltage
In MM1548 series, the output voltage can't be adjusted by external resistor, because referential voltage
terminal (REF pin) for adjustment is build in the chip.
Instead of voltage adjustment, you can chose output voltage by select the rank of MM1548 series.
Output voltage is lower 0.2V (equal to in-out differential control voltage) than 5.1V(equal to the value set by
ROS1 and ROS2).
[Formula]
Output voltage
= Vo –
VLS
= {1+(ROS1/ ROS2)}
1.25 –
VLS
(Vo = 5.1V)
= {1+(2460k/800k)}
1.25 – 0.2
(
VLS = 0.2V)
= 4.9V
[A]
CV MODE
(PO1:Control)
CC MODE
(PO1:Control)
VCS(115mV typ.)
Energy saving mode
(PO1:Open)
Energy saving current detection (load detection release )
Load current detection
CC MODE
Drop curve
(PO1:Control)
114.4mV/RCS
(115mV/RLS)
(200mV/RLS)
34mV/RCS
Load current
V
o(5.1V
typ.)–
VLS(0.2V
typ.)
Output
voltage
(between
OUT
and
CS)
[V]
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