參數(shù)資料
型號(hào)： REG1117FA-5.0
廠商： TEXAS INSTRUMENTS INC
元件分類： 固定正電壓?jiǎn)温份敵鯨DO穩(wěn)壓器
英文描述： 5 V FIXED POSITIVE LDO REGULATOR, 1.55 V DROPOUT, PSSO3
封裝： PLASTIC, TO-263, D2PAK-3
文件頁(yè)數(shù)： 22/22頁(yè)
文件大?。?/td> 655K
代理商： REG1117FA-5.0
REG1117
REG1117A
SBVS001D OCTOBER 1992 REVISED JULY 2004
www.ti.com
9
A simple experiment will determine whether the maximum
recommended junction temperature is exceeded in an
actual circuit board and mounting configuration: Increase
the ambient temperature above that expected in normal
operation until the device’s thermal shutdown is activated.
If this occurs at more than 40
°C above the maximum
expected ambient temperature, then TJ will be less than
125
°C during normal operation.
The internal protection circuitry of the REG1117 was
designed to protect against overload conditions. It was not
intended to replace proper heat sinking. Continuously
running the REG1117 into thermal shutdown will degrade
reliability.
LAYOUT CONSIDERATIONS
The DDPAK (REG1117F-3.3 and REG1117FA) is a
surface-mount power package that has excellent thermal
characteristics. For best thermal performance, the
mounting tab should be soldered directly to a circuit board
copper area, as shown in Figure 3. Increasing the copper
area improves heat dissipation. Figure 4 shows typical
thermal resistance from junction-to-ambient as a function
of the copper area.
3Lead DDPAK(1)
NOTE: (1) For improved thermal performance increase
footprint area. See Figure 4 (Thermal Resistance vs
Circuit Board Copper Area).
All measurements
in inches.
0.
4
5
0.085
0.2
0.51
0.10
0.155
0.05
Figure 3. DDPAK Footprint
THERMAL RESISTANCE vs
CIRCUIT BOARD COPPER AREA
60
50
40
30
20
10
01
2
3
45
Copper Area (inches2)
REG1117F
DDPAK Surface Mount Package
1oz copper
Thermal
Resistance,
q
JA
(
°C/W)
Circuit Board Copper Area
REG1117F
DDPAK SurfaceMount Package
Figure 4. DDPAK Thermal Resistance versus Circuit Board Copper Area
相關(guān)PDF資料
PDF描述
REG1117FAKTTT 1.225 V-1.28 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.55 V DROPOUT, PSSO3
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REG1117FA/KTTT 1.225 V-1.28 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.55 V DROPOUT, PSSO3
REG1117FA2.5KTTTG3 2.5 V FIXED POSITIVE LDO REGULATOR, 1.55 V DROPOUT, PSSO3
REG711EA-3/2K5G4 0.005 A SWITCHED CAPACITOR REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
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