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DH321 Datasheet(PDF) 12 Page - ON Semiconductor

Part # DH321
Description  Green Mode Power Switch
PDF  16 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

DH321 Datasheet(HTML) 12 Page - ON Semiconductor

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FSDH321, FSDL321
www.onsemi.com
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Other Reference Materials
AN−4134: Design Guidelines for Off−line Forward
Converters Using ON Semiconductor Power
Switch
AN−4137: Design Guidelines for Off−line Flyback
Converters Using ON Semiconductor Power
Switch
AN−4140: Transformer Design Consideration for Off−line
Flyback Converters using ON Semiconductor
Power Switch
AN−4141: Troubleshooting and Design Tips for
ON Semiconductor Power Switch Flyback
Applications
AN−4147: Design Guidelines for RCD Snubber of Flyback
AN−4147: Audible Noise Reduction Techniques for FPS
Applications
Table 4. TYPICAL APPLICATION CIRCUIT
Application
Output Power
Input Voltage
Output Voltage (Max Current)
PC Auxiliary Power Supply
10 W
DC 140~375 V
5.0 V (2.0 A)
Features
• High efficiency (> 70% at full load, full input range)
• Low standby mode power consumption (< 1 W at DC
375 V input and 0.5 W load)
• Low component count
• Enhanced system reliability through various protection
functions
• Low EMI through frequency modulation
• Internal soft−start (15 ms)
Key Design Notes
• The delay time for over load protection is designed to
be about 13 ms with C104 of 22 nF. If faster/slower
triggering of OLP is required, C104 can be changed to
a smaller/larger value (eg. 47 nF for about 30 ms).
• The pule−by−pulse peak current limit level(ILIM) is set
to default value 0.7 A by floating the Ipk pin (#4).
• R102 and C101 clamp the DRAIN voltage of MOSFET
below 650 V under all conditions.
Schematic
Figure 26. 10 W PC Auxiliary Power Circuit
T1
EE1625
7
10
D201
SB360
C201
1000uF
16V
C203
470uF
16V
L201
10uH
5V
(+/-5%)
2A
C101
10nF
630V
1
2
4
5
R102
100kΩ
1W
D101
UF4007
C104
22nF
C103
10uF
50V
D103
1N4937
R104
10
Ω
R202
330
Ω
R201
1k
Ω
R203
2k
Ω
C202
100nF
R204
2k
Ω
IC301
H11A817A
IC201
KA431
3
Vfb
Vcc
Drain
GND
6
140~375
VDC
INPUT
IC101
FSDx321
6,7,8
1
2
3
R103
10
Ω
D102
1N4937
C102
47uF
50V
M Vcc
C301
2.2nF
Vstr
5
R101
680kΩ
1W
ZD1
18V
ZD2
18V



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