- 您現在的位置：買賣IC網 > PDF目錄36340 > 935269491115 (NXP SEMICONDUCTORS) 0.3 A SWITCHING REGULATOR, 57.5 kHz SWITCHING FREQ-MAX, PDSO5 PDF資料下載
參數資料
| 型號： | 935269491115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.3 A SWITCHING REGULATOR, 57.5 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | 1.50 MM, PLASTIC, MO-178, SOT-25, SOT-23, SOP-5 |
| 文件頁數： | 6/21頁 |
| 文件大小： | 333K |
| 代理商： | 935269491115 |
Philips Semiconductors
Product data
SA57254-XX
CMOS switching regulator (PWM controlled)
2001 Aug 01
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 (T0).
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 T0. 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 (C0), place a resistor in series with the capacitor
whose value is approximately:
R
snubber ^
T
0
2
pC
0
Eqn. (10)
This should produce a snubber that does not load the circuit and
introduces a very small loss.
SL01506
SA57254-XX
VBATT
GND
FB
SW
VOUT
R
PASSIVE SNUBBER
VDD
Figure 29. Flyback converter with passive snubber.
相關PDF資料 |
PDF描述 |
|---|---|
| 935269496115 | 0.3 A SWITCHING REGULATOR, 57.5 kHz SWITCHING FREQ-MAX, PDSO5 |
| 935269576557 | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 935269580557 | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 935270418112 | 8-CHANNEL, SGL ENDED MULTIPLEXER, PDSO16 |
| 935270418118 | 8-CHANNEL, SGL ENDED MULTIPLEXER, PDSO16 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 935269544557 | 制造商:NXP Semiconductors 功能描述:SUB ONLY TDA9587-2US1-V1.3 |
| 935269987557 | 制造商:NXP Semiconductors 功能描述:SUB ONLY TDA9587-1US1-V1.8 SUBBED TO 935269987557 |
| 935270713557 | 制造商:NXP Semiconductors 功能描述:SUB ONLY IC CHP |
| 935270792551 | 制造商:NXP Semiconductors 功能描述:IC BUFF DVR TRI-ST 16BIT 56VFBGA |
| 935270792557 | 制造商:NXP Semiconductors 功能描述:IC BUFF DVR TRI-ST 16BIT 56VFBGA |
發布緊急采購，3分鐘左右您將得到回復。