FSDH321LX Fairchild Semiconductor, FSDH321LX Datasheet - Page 14

• Manufacturer Part Number: FSDH321LX
• Manufacturer: Fairchild Semiconductor

Specifications of FSDH321LX

• Power Switch Family: FSDH321
• Power Switch On Resistance: 14Ohm
• Output Current: 2A
• Number Of Outputs: Single
• Mounting: Surface Mount
• Supply Current: 3mA
• Package Type: LSOP
• Operating Temperature (min): -25C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Pin Count: 8
• Power Dissipation: 1.4W
• Lead Free Status / RoHS Status: Supplier Unconfirmed

FSDH321, FSDL321
Typical Application Circuit
Features
• High efficiency (>70% at full load, full input range)
• Low standby mode power consumption (<1W at DC 375V input and 0.5W load)
• Low component count
• Enhanced system reliability through various protection functions
• Low EMI through frequency modulation
• Internal soft-start (15ms)
Key Design Notes
• The delay time for over load protection is designed to be about 13ms with C104 of 22nF. If faster/slower triggering of OLP
• The pule-by-pulse peak current limit level(I
• R102 and C101 clamp the DRAIN voltage of MOSFET below 650V under all conditions.
1. Schematic
14
is required, C104 can be changed to a smaller/larger value(eg. 47nF for about 30ms).
140~ 375
Power Supply
INPUT
Application
PC Auxiliary
ZD1
18V
VDC
C104
22nF
FSDx321
IC101
680kΩ
R 101
1W
3
Vfb
Vstr
5
1
GND
Output power
Drain
Vcc
10W
6,7,8
2
C 103
10uF
50V
1N 4937
D 103
M Vcc
ZD2
18V
100kΩ
R 102
UF 4007
1W
D 101
LIM
10W PC Auxiliary Power Circuit
) is set to default value 0.7A by floating the Ipk pin (#4).
C 102
47uF
50V
1N 4937
D 102
C 101
10nF
630V
R 104
10Ω
DC 140~375V
Input voltage
R 103
10Ω
5
6
3
2
1
4
H11A 817A
EE1625
2.2nF
C301
IC 301
T1
10
7
KA431
IC201
SB360
D 201
1000uF
C 201
16V
R 202
330Ω
R 201
1kΩ
Output voltage (Max current)
L 201
10uH
100nF
C 202
5.0V (2.0A)
R 204
R 203
2kΩ
2kΩ
470uF
C 203
16V
(+/-5%)
5V
2A