FSD200_NL Fairchild Semiconductor, FSD200_NL Datasheet - Page 11

• Manufacturer Part Number: FSD200_NL
• Manufacturer: Fairchild Semiconductor

Specifications of FSD200_NL

• Power Switch Family: FSD200
• Input Voltage: -0.3 to 6.7V
• Power Switch On Resistance: 28Ohm
• Number Of Outputs: Single
• Mounting: Through Hole
• Supply Current: 600uA
• Package Type: PDIP
• Operating Temperature (min): -25C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Pin Count: 7
• Lead Free Status / Rohs Status: Compliant

standby mode.
7. Frequency Modulation : EMI reduction can be accom-
plished by modulating the switching frequency of a SMPS.
Frequency modulation can reduce EMI by spreading the
energy over a wider frequency range. The amount of EMI
reduction is directly related to the level of modulation
(Fmod) and the rate of modulation. As can be seen in Figure
14, the frequency changes from 130kHz to 138kHz in 4mS
for the FSD200/FSD210. Frequency modulation allows the
use of a cost effective inductor instead of an AC input mode
choke to satisfy the requirements of world wide EMI limits.
Vds
Vo
V
0.64V
0.58V
Ids
Vo
FB
set
Figure 12. Circuit for burst operation
Vfb
Figure 13. Burst mode operation
4
5uA
250uA
OSC
S
R
Burst Operation Block
/0.58V
0.64V
Q
FSD2xx
DRIVER
GATE
on/off
time
Figure 16. FSD210 Full Range EMI scan(134kHz, with Fre-
Figure 15. FSDH0165 Full Range EMI scan(100kHz, no
Figure 14. Frequency Modulation Waveforms
Frequency Modulation) with charger set
quency Modulation) with charger set
Drain to
Source
current
Drain to
Source
voltage
Turn-on
Oscillator
Internal
Frequency(MHz)
Frequency(MHz)
Waveform
130kHz
Vds
CISPR22Q(PK)
CISPR22Q(PK)
138kHz
134kHz
138kHz
Turn-off
point
8kHz
FSD210, FSD200
CISPR22A(AV)
CISPR22A(AV)
11