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參數(shù)資料
| 型號(hào)： | LT1054MJ8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switched-Capacitor Voltage Converter with Regulator |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 25 kHz SWITCHING FREQ-MAX, CDIP8 |
| 封裝： | 0.300 INCH, HERMETIC SEALED, CERDIP-8 |
| 文件頁數(shù)： | 14/26頁 |
| 文件大小： | 444K |
| 代理商： | LT1054MJ8 |
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SLVS033F FEBRUARY 1990 REVISED NOVEMBER 2004
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power dissipation (continued)
At R
θ
JA
of 130
°
C/W for a commercial plastic device, a junction temperature rise of 122
°
C occurs. The device
exceeds the maximum junction temperature at an ambient temperature of 25
°
C. To calculate the power
dissipation with an external resistor (R
X
), determine how much voltage can be dropped across R
X
. The
maximum voltage loss of the LT1054 in the standard regulator configuration at 100 mA output current is 1.6 V.
V
X
12 V
[(1.6 V)(1.3)
|
5 V|]
4.9 V
and
R
X
4.9 V
(4.4)(100 mA)
11
The resistor reduces the power dissipated by the LT1054 by (4.9 V)(100 mA) = 490 mW. The total power
dissipated by the LT1054 is equal to (940 mW 490 mW) = 450 mW. The junction-temperature rise is 58
°
C.
Although commercial devices are functional up to a junction temperature of 125
°
C, the specifications are tested
to a junction temperature of 100
°
C. In this example, this means limiting the ambient temperature to 42
°
C. To
allow higher ambient temperatures, the thermal resistance numbers for the LT1054 packages represent
worst-case numbers, with no heat sinking and still air. Small clip-on heat sinks can be used to lower the thermal
resistance of the LT1054 package. Airflow in some systems helps to lower the thermal resistance. Wide printed
circuit board traces from the LT1054 leads help remove heat from the device. This is especially true for plastic
packages.
10 V
1N5817
Motor
Tach
1N4002
LT1054
VOUT
VREF
OSC
VCC
CAP
GND
CAP+
FB/SD
100-k
Speed Control
5
μ
F
100 k
10
μ
F
NOTE: Motor-Tach is Canon CKT26-T5-3SAE.
Pin numbers shown are for the P package.
+
+
1
2
3
4
8
7
6
5
+
+
Figure 18. Motor-Speed Servo
(10)
(11)
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