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參數(shù)資料
| 型號： | TDA3675 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Very low dropout voltage/quiescent current 8.5V voltage regulator with enable(帶使能端的低壓差/靜態(tài)電流8.5V電壓穩(wěn)壓器) |
| 中文描述： | 非常低壓差電壓/靜態(tài)電流8.5V電壓調(diào)節(jié)器，使（帶使能端的低壓差/靜態(tài)電流8.5V電壓穩(wěn)壓器） |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 83K |
| 代理商： | TDA3675 |
2000 Feb 01
7
Philips Semiconductors
Preliminary specification
Low dropout voltage/quiescent current
8.5 V voltage regulator with enable
TDA3675
E
XAMPLE
1
The regulator is stabilized with an electrolytic capacitor of
68
μ
F (ESR = 0.5
). At T
amb
=
40
°
C, the capacitor
value is decreased to 22
μ
F and the ESR is increased to
3.5
. The regulator will remain stable at a temperature of
T
amb
=
40
°
C.
E
XAMPLE
2
The regulator is stabilized with an electrolytic capacitor of
10
μ
F (ESR = 3.3
). At T
amb
=
40
°
C, the capacitor
value is decreased to 3
μ
F and the ESR is increased to
20
. The regulator will remain stable at a temperature of
T
amb
=
40
°
C.
E
XAMPLE
3
The regulator is stabilized with a 100 nF MKT capacitor
connected to the output. Full stability is guaranteed when
the output current is larger then 200
μ
A. Because the
thermal influence on this capacitor value is almost zero,
the regulator will remain stable at a temperature of
T
amb
=
40
°
C.
E
XAMPLE
4
The regulator is stabilized with a 100 nF capacitor in
parallel with a electrolytic capacitor of 10
μ
F connected to
the output.
The regulator is now stable under all conditions and
independent of:
The ESR of the electrolytic capacitor
The value of the electrolytic capacitor
The output current.
Application circuits
The maximum output current of the regulator equals:
When T
amb
= 21
°
C and V
P
= 17.5 V, the maximum output
current equals 140 mA.
For successful operation of the IC (maximum output
current capability) special attention has to be given to the
copper area required as heatsink (connected to all
GND pins), the thermal capacity of the heatsink and its
ability to transfer heat to the external environment. It is
possible to reduce the total thermal resistance from
125 to 50 K/W.
A
PPLICATION CIRCUIT WITH BACKUP FUNCTION
Sometimes a backup function is needed to supply, for
example, a microcontroller for a short period of time when
the supply voltage spikes to 0 V (or even
1 V).
ThisfunctioncaneasilybebuiltwiththeTDA3675byusing
an output capacitor with a large value. When the supply
voltage is 0 V (or
1 V), only a small current will flow into
pin REG from this output capacitor (a few
μ
A).
The application circuit is given in Fig.6.
I
REG max
)
150
T
V
P
T
V
P
–
R
th(j-a)
100
V
REG
–
(
)
------------------------------------------------------
=
–
8.5
(
)
×
-------150
=
ndbook, halfpage
MGL832
8
1
2, 3, 6, 7
VREG = 8.5 V
C2
(2)
VI(EN)
5
TDA3675
C1
(1)
1
μ
F
Fig.6 Application circuit with backup function.
V
I(EN)
= 5 V.
(1) C1 is optional (to minimize supply noise only).
(2) C2
≤
4700
μ
F.
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