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參數(shù)資料
| 型號(hào)： | TDA3609JR |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Multiple voltage regulator with switch and ignition buffers |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PZFM17 |
| 封裝： | POWER, PLASTIC, DIL-BENT-SIL, 17 PIN |
| 文件頁數(shù)： | 16/20頁 |
| 文件大小： | 136K |
| 代理商： | TDA3609JR |
1997 Aug 15
16
Philips Semiconductors
Preliminary specification
Multiple voltage regulator with switch and
ignition buffers
TDA3609JR
Application information
N
OISE
Table 1
Noise figures
Note
1.
Measured at a bandwidth of 200 kHz.
The noise on the supply line depends on the value of the
supply capacitor and is caused by a current noise (output
noise of the regulators is translated into a current noise by
means of the output capacitors). When a high frequency
capacitor of 220 nF in parallel with an electrolytic capacitor
of 100
μ
F is connected directly to pins 1 and 14 (supply
and ground) the noise is minimal.
S
TABILITY
The regulators are made stable with the external
connected output capacitors.
REGULATOR
NOISE FIGURE (
μ
V)
(1)
C
O
= 10
μ
F
tbf
tbf
tbf
C
O
= 47
μ
F
150
150
200
C
O
= 100
μ
F
tbf
tbf
tbf
1
2
3
The output capacitors can be selected using the graphs of
Figs 8 and 9. When an electrolytic capacitor is used, the
temperature behaviour of this output capacitor can cause
oscillations at a low temperature. The next 2 examples
show how an output capacitor value is selected.
Example 1
Regulators 1 and 3 are made stable with an electrolytic
output capacitor of 220
μ
F (ESR = 0.15
). At
30
°
C the
capacitor value is decreased to 73
μ
F and the ESR is
increased to 1.1
. The regulator will remain stable at
30
°
C.
Example 2
Regulator 2 is made stable with a 10
μ
F electrolytic
capacitor (ESR = 3
). At
30
°
C the capacitor value is
decreased to 3
μ
F and the ESR is increased to 23.1
.
Using Fig.9, the regulator will be instable at
30
°
C.
Solution
Use a tantalum capacitor of 10
μ
F or a larger electrolytic
capacitor. To avoid problems with stability at low
temperatures, the use of tantalum capacitors is
recommended.
handbook, halfpage
0
0.1
1
10
C (
μ
F)
MGK612
stable region
maximum ESR
100
R
(
)
15
10
5
Fig.8
Curve for selecting the value of output
capacitor for regulators 1 and 3.
handbook, halfpage
2
0
0.22
1
10
C (
μ
F)
MGK613
4
6
8
10
12
stable region
maximum ESR
minimum ESR
100
R
(
)
14
Fig.9
Curve for selecting the value of output
capacitor for regulator 2.
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