參數(shù)資料
型號(hào)： FSDH0265RL_NL
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 8 A SWITCHING REGULATOR, 108 kHz SWITCHING FREQ-MAX, PDSO8
封裝： LEAD FREE, SOP-8
文件頁(yè)數(shù)： 3/23頁(yè)
文件大?。?/td> 1073K
代理商： FSDH0265RL_NL
FSDH0265RN, FSDM0265RN
11
5. Soft Start : The FPS has an internal soft start circuit that
slowly increases the feedback voltage together with the
Sense FET current after it starts up. The typical soft start
time is 15msec, as shown in Figure 8, where progressive
increments of the Sense FET current are allowed during the
start-up phase. The pulse width to the power switching
device is progressively increased to establish the correct
working conditions for transformers, inductors, and capaci-
tors. The voltage on the output capacitors is progressively
increased with the intention of smoothly establishing the
required output voltage. It also helps to prevent transformer
saturation and reduce the stress on the secondary diode.
Figure 8. Soft Start Function
6. Burst Operation : In order to minimize power dissipation
in standby mode, the FPS enters burst mode operation. As
the load decreases, the feedback voltage decreases. As
shown in Figure 9, the device automatically enters burst
mode
when
the
feedback
voltage
drops
below
VBURH(500mV). Switching still continues but the current
limit is set to a fixed limit internally to minimize flux density
in the transformer. The fixed current limit is larger than that
defined by VFB = VBURH and therefore, VFB is driven
down further. Switching continues until the feedback voltage
drops below VBURL(350mV). At this point switching stops
and the output voltages start to drop at a rate dependent on
the standby current load. This causes the feedback voltage to
rise. Once it passes VBURH(500mV), switching resumes.
The feedback voltage then falls and the process repeats.
Burst mode operation alternately enables and disables
switching of the power Sense FET thereby reducing switch-
ing loss in Standby mode.
Figure 9. Burst Operation Function
7. Frequency Modulation : Modulating the switching fre-
quency of a switched power supply can reduce EMI. Fre-
quency modulation 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 10, the frequency changes from 65KHz
to 69KHz in 4ms for the FSDM0265RN (97KHz to 103KHz
for FSDH0265RN). 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 10. Frequency Modulation Waveform
1ms
15steps
Current limit
0.68A
1.5A
t
Drain current
V
BURH
Switching
OFF
Current
Waveform
Burst
Operation
Normal
Operation
V
FB
V
BURL
Switching
OFF
Burst
Operation
3
Vcc
I
DELAY
I
FB
R
2.5R
Vfb
VBURL/VBURH
PWM
+
-
VBURH
Vcc
I
BUR(pk)
Burst
Normal
MOSFET
Current
t
s
f
s=1/ts
67kHz
69kHz
65kHz
4ms
t
Drain
Current
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參數(shù)描述
FSDH0265RLX 功能描述:電源開(kāi)關(guān) IC - 配電 SMPS PwrSwtch 100kHz 20W for DVDP/STB RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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
FSDH0265RN 功能描述:電源開(kāi)關(guān) IC - 配電 SMPS Power Switch 100kHz 20W for RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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
FSDH0265RN_05 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPSTM)
FSDH0270RNB 功能描述:電源開(kāi)關(guān) IC - 配電 FPS FOR DVDP/STB RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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
FSDH0370RNB 功能描述:電源開(kāi)關(guān) IC - 配電 FPS FOR DVDP/STB RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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
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