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參數(shù)資料
| 型號： | TK65431M |
| 廠商： | TOKO Inc. |
| 英文描述： | STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| 中文描述： | 降壓轉(zhuǎn)換器與電池監(jiān)視器 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 762K |
| 代理商： | TK65431M |
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Page 16
TK654xx
September 1999 TOKO, Inc.
ADVANCED INFORMATION
NOISE CONSIDERATIONS (CONT.)
COIL
The coil magnetic field can also be a source of noise. This noise is more characteristic of radiated Electromagnetic
Interference (EMI). This radiated noise can interfere with RF communications systems if care is not taken by the system
designer. A shielded coil can improve this source of EMI.
SNUBBER
When the inductor current flowing through the output diode decays to zero, the parasitic capacitance at the switch pin
(pin 3) resulting from the internal switch and external diode has energy which rings back into the inductor. This high
frequency ringing is an undesirable source of radiated noise. Fortunately, due to the low amount of energy in this ringing,
a simple RC snubber as shown in Figure 5 easily eliminates it. In low noise applications the RC snubber is recommended,
although an efficiency penalty of approzimately 2% will result.
C1
22 μF
L1
100 μH
VOUT = 3 V
LBI
GND
VIN
LBO
VOUT
SW
VIN = 5 V
D1
LL 103
220
PF
1 K
FIGURE 5: OPTIONAL SNUBBER
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| TK65432M | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| TK65432MTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR |
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