參數(shù)資料
型號(hào)： SA57254-XX
廠商： NXP Semiconductors N.V.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 14/18頁(yè)
文件大?。?/td> 267K
代理商： SA57254-XX
Philips Semiconductors
Product data
SA57254-XX
CMOS switching regulator (PWM controlled)
2003 Nov 11
14
Designing a passive snubber
If the switching power supply is generating too much radio
frequency interference (RFI) a
passive snubber
can be added.
A passive snubber is a series resistor and capacitor placed across
any component that exhibits a resonant “ringing”. This series R-L-C
loop creates a lossy or damped tank circuit that dissipates the
ringing energy. The design is critical, because it introduces another
loss within the converter.
Designing a snubber is an empirical process, mainly because it
involves undefined parasitic capacitances and inductances
contributed by the PCB layout, leakage inductance, and device
capacitances. The snubber should be placed across the major
source of the spike or ringing which is the output rectifier for a boost
converter (see Figure 24) and the primary winding of the transformer
for a flyback transformer.
The usual design process is:
1. Measure the period of the undesired ringing (T
0
).
2. Place a very small ceramic capacitor (about 10 pF) across the
output rectifier or primary winding.
3. Re-measure the period of the undesired ringing. The new period
should be about 3 times that of T
0
. If it is less than this, place a
slightly larger value of capacitor across the output rectifier or
primary winding.
4. Once the desired increase in the ringing period is achieved with
a capacitance (C
0
), place a resistor in series with the capacitor
whose value is approximately:
R
snubber
T
0
2 C
0
Eqn. (10)
This should produce a snubber that does not load the circuit and
introduces a very small loss.
SL01506
SA57254-XX
V
BATT
GND
FB
SW
V
OUT
R
PASSIVE SNUBBER
V
DD
Figure 29. Flyback converter with passive snubber.
相關(guān)PDF資料
PDF描述
SA57254-28GW RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
SA57254-30GW Ceramic Multilayer Capacitor; Capacitance:47pF; Capacitance Tolerance:+/- 5 %; Working Voltage, DC:100V; Dielectric Characteristic:C0G/NP0; Package/Case:0603; Series:VJ; Leaded Process Compatible:Yes; Mounting Type:Surface Mount
SA57254-33GW RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
SA57254-36GW RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
SA57254-50GW Ceramic Multilayer Capacitor; Capacitance:4.7pF; Capacitance Tolerance:+/- 0.25 pF; Working Voltage, DC:50V; Dielectric Characteristic:C0G/NP0; Package/Case:0603; Series:VJ; Leaded Process Compatible:Yes; Mounting Type:Surface Mount
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SA57254-XXGW 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:CMOS switching regulator (PWM controlled)
SA572D 功能描述:音頻放大器 Dual Channel Hi Perf RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
SA572DG 功能描述:音頻放大器 Dual Channel Hi Perf Compandor Ind. Temp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
SA572DG 制造商:ON Semiconductor 功能描述:Standard Recovery Rectifier
SA572DR2 功能描述:音頻放大器 Dual Channel Hi Perf RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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