FSDL321 Fairchild Semiconductor, FSDL321 Datasheet - Page 14

• Manufacturer Part Number: FSDL321
• Description: IC SWIT PWM GREEN CM OVP HV 8DIP
• Manufacturer: Fairchild Semiconductor

Specifications of FSDL321

• Output Isolation: Isolated
• Frequency Range: 45 ~ 55kHz
• Voltage - Input: 8 ~ 20 V
• Voltage - Output: 650V
• Power (watts): 17W
• Operating Temperature: 25°C ~ 140°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Power Switch Family: FSDL321
• Power Switch On Resistance: 14Ohm
• Output Current: 2A
• Number Of Outputs: Single
• Mounting: Through Hole
• Supply Current: 3mA
• Package Type: PDIP
• Operating Temperature (min): -25C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Pin Count: 8
• Power Dissipation: 1.4W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FSDL321_NL; FSDL321_NL

FSDH321, FSDL321
Typical application circuit
1. PC Auxiliary Power Circuit (10W Output Power)
10W PC Auxiliary Power, 150~375VDC Input Power
supply:
It shows an auxiliary power for PC. Efficiency at 10W, 150/
375VDC is ≥70%.
The PC application has the standard of standby power con-
sumption, under 1W at the output load 0.5W and input volt-
age 230VAC. For this the FSDH321 also has the burst
operating function like other green mode FPS’ such as
FSDM0265RN or FSDM0365RN and so on. This skill
reduces the MOSFET switching numbers and power MOS-
FET switching loss. This design takes advantage of self pro-
tection without external components and high switching
frequency, 100kHz. The frequency makes using a small size
transformer core possible. The EE16 or EE1625 can be used
for 10W application.
This is achieved by preventing the green FPS from switching
when the input voltage goes below a level needed to main-
tain output regulation, and keeping it off until the input volt-
age goes above the under-voltage threshold, when the AC is
turned on again. For example with the resistor, R101,
680kΩ, the threshold voltage is around 150VAC(210VDC)
at the room temperature.
Surge voltages on the DRAIN pin due to the leakage induc-
14
140~ 375
INPUT
ZD1
19V
VDC
C104
22nF
FSDx321
IC 101
680k Ω
R 101
1W
3
Vstr
Vfb
5
1
GND
Drain
Vcc
6,7,8
2
C 103
10uF
50V
1N 4937
D 103
M Vcc
ZD2
19V
100kΩ
R 102
UF 4007
1W
D 101
10W PC Auxiliary Power Circuit
C 102
47uF
50V
1N 4937
D 102
C 101
10nF
630V
R 104
10Ω
R 103
10Ω
5
6
3
1
2
4
H 11A 817A
tance is clamped by R102 and C101, keeping the DRAIN
voltage below 650 V under all conditions. The frequency
modulation feature of FSDH321 allows the circuit shown to
meet CISPR2AB with simple EMI filtering. The secondary
is rectified and smoothed by D201. Similarly D102 and
D103 are also rectifiers for main power control IC and
FSDH321 respectively. The 5V output voltage require two
capacitors in parallel to meet the ripple current requirement.
Switching noise filtering is provided by L201. The output is
regulated by the reference (TL431) voltage in secondary. It
is sensed via R203 and R204. Resistor R201 provides bias
for TL431 and R202 sets the overall DC gain. R202, C202
and R203 provide loop compensation.
EE 1625
2.2 nF
PC 301
C 301
T1
10
7
KA431
IC 201
SB 360
D 201
1000uF
C 201
16V
R 202
330Ω
R 201
1k Ω
10uH
L 201
100nF
C 202
R 204
R 203
2kΩ
2kΩ
470uF
C 203
16V
(+/-5 %)
5V
2A