FSDM0365RNB Fairchild Semiconductor, FSDM0365RNB Datasheet - Page 16

• Manufacturer Part Number: FSDM0365RNB
• Description: IC SWIT PWM GREEN CM OVP HV 8DIP
• Manufacturer: Fairchild Semiconductor

Specifications of FSDM0365RNB

• Output Isolation: Isolated
• Frequency Range: 61 ~ 73kHz
• Voltage - Input: 8 ~ 20 V
• Voltage - Output: 650V
• Power (watts): 30W
• Operating Temperature: 25°C ~ 140°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FSDM0365RNB_NL; FSDM0365RNB_NL

FSDL0365RNB, FSDM0365RNB
Typical application circuit
1. Set Top Box Example Circuit (20W Output Power)
Multiple Output, 20W, 85-265VAC Input Power supply:
Figure 15 shows a multiple output supply typical for high
end set-top boxes containing high capacity hard disks for
recording or LIPS(LCD Inverter Power Supply) for 15"
LCD monitor. The supply delivers an output power of 20W
cont./24 W peak (thermally limited) from an input voltage of
85 to 265 VAC. Efficiency at 20W, 85VAC is ≥75%.
The 3.3 V and 5 V outputs are regulated to ±5% without the
need for secondary linear regulators. DC stacking (the sec-
ondary winding reference for the other output voltages is
connected to the anode of D15. For more accuracy, connec-
tion to the cathode of D15 will be better.) is used to minimize
the voltage error for the higher voltage outputs. Due to the
high ambient operating temperature requirement typical of a
set-top box (60 °C) the FSDM0365RNB is used to reduce
conduction losses without a heatsink. Resistor R5 sets the
device current limit to limit overload power.
Leakage inductance clamping is provided by R1 and C8,
keeping the DRAIN voltage below 650 V under all condi-
tions. Resistor R1 and capacitor C8 are selected such that R1
dissipates power to prevent rising of DRAIN Voltage caused
by leakage inductance. The frequency modulation feature of
FSDM0365RNB allows the circuit shown to meet
CISPR2AB with simple EMI filtering (C1, LF1 and C2) and
the output grounded. The secondaries are rectified and
smoothed by D12, D13, D14,and D15. Diode D15 for the
3.4V output is a Schottky diode to maximize efficiency.
Diode D14 for the 5 V output is a PN type to center the 5 V
output at 5 V. The 3.3 V and 5 V output voltage require two
capacitors in parallel to meet the ripple current requirement.
16
~275VAC
85VAC
PERFORMANCE SUMMARY
Output Power:
Regulation
3.3V:
5.0V:
17.0V:
23.0:
Efficiency:
No load Consumption:
0.12W at 230Vac
2A/250V
FUSE
100pF
/400V
C1
40mH
LF1
100pF
/400V
C2
Figure15. 20W multiple power supply using FSDM0365RNB
≥75%
±7%
±5%
±5%
±7%
20W
KBP06M
GreenFPS
400V
/47u
C7
ZD1
19V
D
47uF
G Vcc Vfb
1
50V
C6
FSDM0365RNB
D
50V
C9
33n
56K/1/
R3
4W
D
ZD2
19V
start
I_pk
5
6kR
R5
47K
R1
UF4004
D6
PC817
6.8n/1k
C8
V
UF4007
D5
30R
R4
Switching noise filtering is provided by L3, L2 and L1.
Resistor R15 prevents peak charging of the lightly loaded
23V output. The outputs are regulated by the reference
(TL431) voltage in secondary. Both the 3.3 V and 5 V out-
puts are sensed via R13 and R14. Resistor R22 provides bias
for TL431and R21 sets the overall DC gain. Resistor R21,
C209, R14 and R13 provide loop compensation.
Q1
FOD2741A
4
5
1
3
10
12
11
6
8
EGP20D
D12
EGP20D
PC817
TL431AZ
EGP20D
SB360
D13
330R
D14
D15
R21
20R
R15
R15
1000uF
0.1uF/mon
1000uF
C17
C15
C13
C11
1KR
/16V
R22
/16V
100uF
470uF
olithic
/50V
/35V
L1
6.9K
C209
L3
L2
800R
R14
R12
1.5K
470uF
470uF
/10V
R13
C12
2.7K
/10V
C14
C16
220uF
100uF
/35V
/50V
R19
R20
0.005~0.45A
0.01~0.5A
+17.0V
0.4~1.4A
+23.0V
+5.0V
+3.3V
0.2~0.85A