FSDL321 Fairchild Semiconductor, FSDL321 Datasheet - Page 12

• 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
Figure 12. FSDX-series FPS Full Range EMI Scan (67KHz,
12
Figure 11. KA5-series FPS Full Range EMI scan(67KHz,
with Frequency Modulation) with DVD Player SET
no Frequency Modulation) with DVD Player SET
Frequency (MHz)
Frequency (MHz)
8. Adjusting Peak Current Limit : As shown in Figure 13,
a combined 2.8kΩ internal resistance is connected to the
non-inverting lead on the PWM comparator. A external
resistance of Rx on the current limit pin forms a parallel
resistance with the 2.8kΩ when the internal diodes are
biased by the main current source of 900uA.
For example, FSDx321 has a typical Sense FET peak current
limit (I
ing Rx between the Ipk pin and the ground. The value of the
Rx can be estimated by the following equations:
0.7A : 0.5A = 2.8kΩ : XkΩ ,
X = Rx || 2.8kΩ .
(X represents the resistance of the parallel network)
Rx
LIM
Figure 13. Peak Current Limit Adjustment
) of 0.7A. I
Vfb
Ipk
3
4
I
DELAY
Vcc
5uA
LIM
I
FB
can be adjusted to 0.5A by insert-
Vcc
900uA
0.8k
2k
Ω
Ω
Comparator
PWM
SenseFET
Current
Sense