Flyback switching power supply applications
OB2268/OB2269
OB2268/OB2269
-
.:
,, OB2268/OB2269 ,, 。OB2268/OB2269 ,:
▲ :OB2268/OB2269 , ( 1/30 ) 。
▲: OB2268/OB...
Description
OB2268/OB2269
OB2268/OB2269
-
.:
,, OB2268/OB2269 ,, 。OB2268/OB2269 ,:
▲ :OB2268/OB2269 , ( 1/30 ) 。
▲: OB2268/OB2269 , 。。
▲ :OB2268/OB2269 VIN/VDD 4uA, ,。
▲ :OB2268/OB2269 2.3mA,, 。
▲ :(LEB), R-C , 。
▲ OCP :OB2268/OB2269 OCP , OCP ,。
▲ :OB2268/OB2269 。OVP,UVLO, OCP, OPP OTP , 。
▲ MOSFET : EMI。 ▲ :OB2268/OB2269 ,,
。 ▲ OB2269 EMI :OB2269
EMI , EMI 。
©On-Bright Electronics
-1-
Confidential
OB_DOC_DG_68690A
.
1. OB2268
OB2268/OB2269
2. OB2269
.:
©On-Bright Electronics
-2-
Confidential
OB_DOC_DG_68690A
OB2268/OB2269
RIN Rbias
1 OB2268/OB2269
.OB2268 OB2269 :
1. OB2268/69
, , , ,
No shuffling frequency
OB2268
OB2268B
OB2268C
√√
√√
√√
√√
shuffling frequency
OB2269
OB2269C
√
√
√
√
2. OB2268&OB2269
OB2268 OB2269 : 1) OB2269 (shuffling), EMI ,
, EMI 。 2) OB2268 OCP 65KHz ,OB2269 OCP 60KHz 。
.:
1. OCP :
©On-Bright Electronics
-3-
Confidential
OB_DOC_DG_68690A
OB2268/OB2269
1.1 OB2268/OB2269 :
1) OCP : 3 VIN OCP , , 1 。
2) : 7 VDD , 2, 3:
AC IN
EMI R1 Filter
R2
D1
C1 BD1
VDD
OB2268/69
GND
R3 R4
C2
D2
AC IN
EMI Filter
C2 BD1
R1 R2
VDD
OB2268/69
GND
D1 R3 C1
2
3
1.2 :
RIN VDD C1 , VDD VTH(ON)( 16.5V) 。 3 :
:
⎡ T ⎤D _ ON
V V I R eVTH (ON ) = (
−
dc
⋅
DDST
IN
)
⎢1 ⎢⎣
−
RIN⋅C1 ⎥ ⎥⎦
(1)
IDDST : OB2268/69
TD_ON:
RIN:
R1 R2
,RIN , 1.5MΩ~3MΩ 。
, 4。
AC IN
EMI Filter
C2 BD1
R1 R2
4 , C1
(),RIN ( OCP , 1.4 OCP
),
VIN
VDD
OB2268/69
GND
D1 C1 C3
R3
。 4 ,
16V...
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