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PDF STR-A6351 Data sheet ( Hoja de datos )
| Número de pieza | STR-A6351 | |
| Descripción | STR-A6300 Series | |
| Fabricantes | SanKen | |
| Logotipo |  |
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1. STR-A6351 datasheet pinout  Hay una vista previa y un enlace de descarga de STR-A6351 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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STR-A6300 Application Notes
（Ver.1.2）
STR-A6300 Series
Application Notes(Ver. 1.2)
May 15th, 2002
System Engineering Dept.
Semiconductor Operations
Sanken Electric Co., Ltd.
Page 1
1 page  
STR-A6300 Application Notes
（Ver.1.2）
4 OUTLINE DRAWINGS&PIN ARRANGEMENT
Note: Below are reference drawings. For details, please see each data sheet.
8765
A6351
SK
a
b
c
1234
a.品名標示
Type Number
b.ロット番号
Lot Number
第１文字 西暦年号下一桁
1st letter The last digit of year
第２文字 月
2nd letter
Month
1～9月 ：アラビア数字
10月
：O
11月
：N
12月
：D
(1 to 9 for Jan. to Sept.,
O for Oct. N for Nov. D for Dec.)
第3文字
製造週
3rd letter
Week
1～3
アラビア数字
Arabic numerals
c.弊社管理番号
Sanken Registration Number
端子材質：Cu
Material of terminal: Cu
端子の処理：半田メッキ
Treatment of terminal:solder plating
製品重量：約0.51g
Weight: Approx. 0.51g
Page 5
5 Page 
STR-A6300 Application Notes
≒5V
発振器電圧
≒0V
≒0.76V
C5両端電圧
≒0V
STR-A6300
ﾌｫﾄﾄﾗﾝｼﾞｽﾀによる直流ﾊﾞｲｱｽ
OSC
発振器出力 ON
0
MOSFET
OFF
ON
DC bias by
photo -transistor
PWM Latch
SQ
R
OCP.Comp
Vth(1)
+
‐
Reg1
Drive
Fig.7 Oscillati図n7g 定O電p圧er制a御tio時nのa発t振c動on作stant voltage control
（Ver.1.2）
⑦⑧D
PC
R2
①S VR4
④OCP/FB
②⑤Gnd
R4
C5
R5
VR5
Feedback current (FB current) through a photo-coupler flows to R4, and the voltage drop VR4 is added to
VR5. That is, the VR4 (FB current) controls the VR5 voltage (peak ID) which requires to reverse the OCP
Comp., and the output is controlled in the current mode.
Generally, in the current mode control, the bias from VR4 increases at light mode, and the OCP Comp. shall
be functioned faultily by the noise caused from the surge current at the MOSFET turn-ON. In order to avoid
this problem, the impedance between the OCP/FB (No.5) and the GND terminal is reduced by an
Active-Low-Pass Filter Circuit while the MOSFET is turned OFF.
The Active-Low-Pass Filter circuit is composed of the 0.8mA constant current by-pass circuit between the
OCP/FB (No.5) and the GND terminal, and it reduces the bias by 50% until the MOSFET is turned ON.
This function enables C5 to absorb surge noise when the MOSFET is turned ON and achieves a stable
control at light load.
Page 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet STR-A6351.PDF ] | |
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