參數(shù)資料
型號(hào)： TC2574-VOETR
元件分類： 穩(wěn)壓器
英文描述： 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO16
封裝： WIDE, SOIC-16
文件頁(yè)數(shù)： 7/25頁(yè)
文件大?。?/td> 212K
代理商： TC2574-VOETR
15
TC2574
0.5A Step-Down Switching Regulator
TC2574-1 1/6/00
exception to this is the output (switch) pin, which should not
have large areas of copper in order to minimize coupling to
sensitive circuitry.
Additional improvement in heat dissipation can be
achieved even by using of double sided or multilayer boards
which can provide even better heat path to the ambient.
Using a socket for the 8-Pin PDIP (narrow) package is
not recommended because socket represents an additional
thermal resistance, and as a result the junction temperature
will be higher.
Since the current rating of the TC2574 is only 0.5 A, the
total package power dissipation for this switcher is quite low,
ranging from approximately 0.1
up to 0.75 under varying
conditions. In a carefully engineered printed circuit board,
the through–hole PDIP package can easily dissipate up to
0.75
, even at ambient temperatures of 60°C, and still keep
the maximum junction temperature below 125
°C.
Thermal Analysis and Design
The following procedure must be performed to deter-
mine the operating junction temperature. First determine:
1. PD(max) – maximum regulator power dissipation in the
application.
2. TA(max) – maximum ambient temperature in the
application.
3. TJ (max) – maximum allowed junction temperature
(125
°C for the TC2574). For a conservative design, the
maximum junction temperature should not exceed 110
°C
to assure safe operation. For every additional +10
°C tem-
perature rise that the junction must withstand, the estimated
operating lifetime of the component is halved.
4.
ΘJC – package thermal resistance junction–case.
5.
ΘJA – package thermal resistance junction–
ambient.
(Refer to Absolute Maximum Ratings on page 2 of this
data sheet or
ΘJC and ΘJA values).
The following formula is to calculate the approximate
total power dissipated by the TC2574:
PD = (VIN x IQ ) + d x ILOAD x VSAT
where d is the duty cycle and for buck converter
d =
tON
=
VO
T
VIN
IQ (quiescent current) and VSAT can be found in the
TC2574 data sheet,
VIN is minimum input voltage applied,
VO is the regulator output voltage,
ILOAD is the load current.
The dynamic switching losses during turn-on and
turn-off can be neglected if a proper type catch diode is used.
The junction temperature can be determined by the follow-
ing expression:
TJ = (ΘJA )(PD ) + TA
where (
Θ
JA )(PD ) represents the junction temperature rise
caused by the dissipated power and TA is the maximum
ambient temperature.
Some Aspects That can Influence
Thermal Design
It should be noted that the package thermal resistance
and the junction temperature rise numbers are all approxi-
mate, and there are many factors that will affect these
numbers, such as PC board size, shape, thickness, physical
position, location, board temperature, as well as whether the
surrounding air is moving or still. At higher power levels the
thermal resistance decreases due to the increased air
current activity.
Other factors are trace width, total printed circuit copper
area, copper thickness, single– or double–sided, multilayer
board, the amount of solder on the board or even color of the
traces.
The size, quantity and spacing of other components on
the board can also influence its effectiveness to dissipate
the heat. Some of them, like the catch diode or the inductor
will enerate some additional heat.
Figure 8. Inverting Buck-Boost Develops –12V
D1
MBR150
L1
68 mH
Output
7
1
Feedback
8.0 to 25 V
Unregulated
DC Input
5
3
4ON/OFF
Pwr
GND
+VIN
–12 V @ 100mA
Regulated
Output
TC2574
(12V)
2
Sig
GND
COUT
680
F
CIN*
22
F
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC2574VPA 制造商:Rochester Electronics LLC 功能描述:- Bulk
TC2574-VPA 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:0.5A Step-Down Switching Regulator
TC2575 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:1.0A Step-Down Switching Regulator
TC2575-12.0VAT 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:1.0A Step-Down Switching Regulator
TC2575-3.3VAT 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:1.0A Step-Down Switching Regulator
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