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TDA3675 데이터시트(PDF) 7 Page - NXP Semiconductors

부품명 TDA3675
상세설명  Low dropout voltage/quiescent current 8.5 V voltage regulator with enable
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA3675 데이터시트(HTML) 7 Page - NXP Semiconductors

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2000 Feb 01
7
Philips Semiconductors
Preliminary specification
Low dropout voltage/quiescent current
8.5 V voltage regulator with enable
TDA3675
EXAMPLE 1
The regulator is stabilized with an electrolytic capacitor of
68
µF (ESR = 0.5 Ω). At Tamb = −40 °C, the capacitor
value is decreased to 22
µF and the ESR is increased to
3.5
Ω. The regulator will remain stable at a temperature of
Tamb = −40 °C.
EXAMPLE 2
The regulator is stabilized with an electrolytic capacitor of
10
µF (ESR = 3.3 Ω). At Tamb = −40 °C, the capacitor
value is decreased to 3
µF and the ESR is increased to
20
Ω. The regulator will remain stable at a temperature of
Tamb = −40 °C.
EXAMPLE 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
µA. Because the
thermal influence on this capacitor value is almost zero,
the regulator will remain stable at a temperature of
Tamb = −40 °C.
EXAMPLE 4
The regulator is stabilized with a 100 nF capacitor in
parallel with a electrolytic capacitor of 10
µF 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 Tamb =21 °C and VP = 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.
APPLICATION 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).
This function can easily be built with the TDA3675 by using
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
µA).
The application circuit is given in Fig.6.
I
REG max
()
150
T
amb
R
th(j-a)
V
P
V
REG
()
×
-------------------------------------------------------
=
150
T
amb
100
V
P
8.5
()
×
------------------------------------------ (mA)
=
ndbook, halfpage
MGL832
VP
81
2, 3, 6, 7
VREG = 8.5 V
C2(2)
VI(EN)
5
TDA3675
C1(1)
1
µF
Fig.6 Application circuit with backup function.
VI(EN) =5V.
(1) C1 is optional (to minimize supply noise only).
(2) C2
≤ 4700 µF.


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