MM1548 データシートの表示（PDF） - Mitsumi
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MM1548 Datasheet PDF : 12 Pages
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MITSUMI
Secondary Control for Energy-Saving AC Adaptor MM1548
2.2 for Constant current detection (RCS adjust method)
Constant current value is set by RCS value as load detection resistor.
On the design, constant current operation changes when [load current] > 520[mA] in the case of 0.22Ω use.
[Formula]
[Constant current control] = VCS1 / RCS
[Drop curve]
= VCS2 / RCS
(VCS1 = 114.4mV)
(VCS2 = 34mV)
RCS(constant current detection resistor) - constant current control value
1200
1100
1000
900
800
700
600
500
400
300
200
0.1
I= (VCS1) / RCS
0.22Ω
RCS(constant current detection resistor) [Ω]
min.
typ.
max.
1.0
2.3 Description of load detection and energy saving detection (RLS adjust method)
Load detection current and energy saving detection current is set by RLS as load detection resistor.
On the design, each current changes when [current flows through RLS] > 240µA, in the case of 470Ω use.
[Formula]
[Load detection current]
= ( VLSP1 / RLS) ( VLSP1 = 200mV)
[Energy saving detection current] = ( VLSP2 / RLS) ( VLSP2 = 115mV)
RLS (Load detection resistor) - Energy saving detection current
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
0.1
I= ( VLSP2) / RLS
470Ω
1
RLS (Load detection resistor) [kΩ]
min.
typ.
max.
10
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