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參數(shù)資料
| 型號： | FSD200BM |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Green Mode Fairchild Power Switch (FPS) |
| 中文描述： | 0.365 A SWITCHING REGULATOR, 142 kHz SWITCHING FREQ-MAX, PDSO7 |
| 封裝： | LSOP-7 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 853K |
| 代理商： | FSD200BM |
FSD210B, FSD200B
11
6. Burst operation :
In order to minimize the power dissi-
pation in standby mode, the FSD200B/210B enter burst
mode operation. As the load decreases, the feedback voltage
decreases. The device automatically enters burst mode when
the feedback voltage drops below V
BURL
(0.58V). At this
point switching stops and the output voltages start to drop.
This causes the feedback voltage to rise. Once is passes
V
BURH
(0.64V) switching starts again. The feedback voltage
falls and the process repeats. Burst mode operation alter-
nately enables and disables switching of the power MOSFET
to reduce the switching loss in the standby mode.
Figure 12. Burst Operation Function
7. Frequency Modulation
: Modulating the switching fre-
quency of a switched power supply can reduce EMI by
spreading the energy over a wider frequency range than the
bandwidth measured by the EMI test equipment. The
amount of EMI reduction is directly related to the depth of
the reference frequency. As can be seen in Figure 13, the fre-
quency changes from 130KHz to 138KHz in 4ms for the
FSD200B/210B. 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.
Figure 13. Frequency Modulation Waveform
Figure 14. FSDH0165 Full Range EMI scan(100kHz, no
Frequency Modulation) with charger set
Figure 15. FSD210B Full Range EMI scan(134kHz, with
Frequency Modulation) with charger set
V
FB
Vds
0.58V
0.64V
Ids
Vo
Vo
set
t
OSC
4
Vfb
S
R
Q
GATE
DRIVER
5uA
250uA
0.64V
/0.58V
on/off
FSD2xxB
Burst Operation Block
t
s
f
s
=1/t
s
134kHz
130kHz
138kHz
4ms
t
Drain
Current
Frequency(MHz)
A
μ
V
CISPR22Q(PK)
CISPR22A(AV)
A
μ
V
Frequency(MHz)
CISPR22Q(PK)
CISPR22A(AV)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FSD210B | Green Mode Fairchild Power Switch (FPS) |
| FSD210BM | Green Mode Fairchild Power Switch (FPS) |
| FSD270 | SILICON DUAL VARIABLE CAPACITANCE DIODE |
| FSD270TA | SILICON DUAL VARIABLE CAPACITANCE DIODE |
| FSD270(2) | |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSD200BMX | 功能描述:電源開關(guān) IC - 配電 TBD RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| FSD200M | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPSTM) |
| FSD20A30 | 制造商:SANREX 制造商全稱:SanRex Corporation 功能描述:THYRISTOR MODULE (SINGLE PHASE BRIDGE TYPE) |
| FSD20A60 | 制造商:SANREX 制造商全稱:SanRex Corporation 功能描述:THYRISTOR MODULE (SINGLE PHASE BRIDGE TYPE) |
| FSD20A90 | 制造商:NIEC 制造商全稱:Nihon Inter Electronics Corporation 功能描述:Low Forward Voltage Drop Diode |
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