lc5500 Sanken Electric Co., Ltd., lc5500 Datasheet - Page 28
![no-image](/images/manufacturer_photos/0/5/582/sanken_electric_co___ltd__sml.jpg)
lc5500
Manufacturer Part Number
lc5500
Description
Lc5500?????????mosfet ???ic
Manufacturer
Sanken Electric Co., Ltd.
Datasheet
1.LC5500.pdf
(38 pages)
- Current page: 28 of 38
- Download datasheet (2Mb)
Copy Right: SANKEN ELECTRIC CO., LTD.
部の波形を図 7-34 に示します。
が流れなくなります。フィードバック電流がなくなると、FB 端子内部の定電流源で COMP 端子に接続された C6
を充電します。
間 t
振を完全に止めます。このとき、起動回路を同時に ON し、再起動と停止を繰り返す間欠発振動作を行いま
す。
FB 端子電圧が OLP しきい電圧 2 V
LC552XD/LC552XF (絶縁用)
LC552XD/LC552XF の FB 端子周辺回路図を図 7-33 に示し、過負荷保護機能(OLP)が動作したときの各
過負荷状態になると、出力電圧が低下するため、2 次側のエラーアンプがカットオフし、フィードバック電流
BW
V
V
= 500ns になります。その後、FB 端子は充電を続け、OLP しきい電圧 1 V
CC
I
FB
D
LC5500 シリーズ
S/GND
1
LC552XD
Rocp
OLP 検出
シリーズ
シリーズ アプリケーションノート
シリーズ
OCP
3
7VReg
FB
アプリケーションノート
アプリケーションノート
アプリケーションノート
図 7-33 FB 端子周辺回路図
4
FB(OLP)2
図 7-34 OLP 動作時の各部波形
C6
R7
= 4.5V(TYP)に達すると、ON 幅はリーディング・エッジ・ブランキング時
再起動
Page.28
V
FB(MIN)
S/GND
2
LC552XF
Rocp
= 0.8V
OCP
7
7VReg
FB
6
時間
FB(OLP)1
C6
V
GND(V
GND(V
CC(ON)
= 5.5V(TYP)に達すると発
R7
V
V
V
GND(I
CC(BIAS)1
FB(OLP)2
V
FB(OLP)1
CC(OFF)
= 15.1V(TYP)
CC
FB
)
)
D
= 4.5V(TYP)
)
= 5.5V(TYP)
= 11.0V(TYP)
= 9.4V(TYP)
Rev. 0.3
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