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參數(shù)資料
| 型號： | TK11830 |
| 廠商： | TOKO Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | POSITIVE-TO-NEGATIVE DC-DC CONVERTER |
| 中文描述： | 正到負(fù)DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 85K |
| 代理商： | TK11830 |
Page 12
January 1999 TOKO, Inc.
TK11830
The components shown in the test circuit may be changed
for different operating conditions (input/output voltage,
output current, inductor type, etc.) The performance of the
DC-DC converter depends largely on the coil in use. To
optimize efficiency, a coil with a low DC resistance should
be used, such as the Toko 646CY471M. Oscillation will
begin with an inductor value as low as 100
μ
H. However,
if the Equivalent Series Resistance (ESR) is over 5
,
oscillation may not occur. The input and output capacitors
should have a low ESR and high capacity since there is a
large ripple current present. For operation below 0
°
C, the
capacitors should be selected for low ESR and good
temperature stability at reduced temperatures. This is
required to minimize ripple current. For low values of load
current, a smaller coil can be used. For higher current, a
large coil is needed to prevent saturation. When the coil
saturates, the current increases dramatically, resulting in
a severe overcurrent through the inductor. Please refer to
the following drawings.
PD (mW)
25
50
75
150
TA (
°
C)
Tj = 150
°
C
0
50
100
TA (
°
C)
P
150
0
450
750
150
300
600
MOUNTED
FREE AIR
TIME
I
INDUCTOR CURRENT WAVEFORM
(NORMAL)
TIME
I
INDUCTOR CURRENT WAVEFORM
(SATURATED INDUCTOR)
APPLICATION INFORMATION (CONT.)
17.5 mm
2
11830
OUT
VOUT
+
COUT
R2
Di
R1
CFB
0.01
CREF
1 μF
ON/OFF
300 k
RSD
VIN
GND
+
5
6
4
2
1
3
L
CIN
TK11830
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| TK118A | 制造商:Thomas & Betts 功能描述:Fittings Coupler 3inch Steel |
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