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参数资料
| 型号： | LT1054CDWE4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 35 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, SOIC-16 |
| 文件页数： | 6/30页 |
| 文件大小： | 607K |
| 代理商： | LT1054CDWE4 |
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LT1054
SWITCHED-CAPACITOR VOLTAGE CONVERTERS
WITH REGULATORS
SLVS033F FEBRUARY 1990 REVISED NOVEMBER 2004
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power dissipation (continued)
At RθJA 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 (RX), determine how much voltage can be dropped across RX. 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) ) |*5V|] + 4.9 V
and
R
X
+
4.9 V
(4.4)(100 mA)
+ 11 W
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
Ω
Speed Control
5
μF
100 k
Ω
10
μF
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1054CDWG4 | 功能描述:电荷泵 Swed-Capacitor Vltg Converters RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| LT1054CDWR | 功能描述:电荷泵 Bipolar Regulated V RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| LT1054CDWRE4 | 功能描述:电荷泵 Switched-Capacitor Voltage Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| LT1054CDWRG4 | 功能描述:电荷泵 Swed-Capacitor Vltg Converters RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| LT1054CN8 | 功能描述:IC REG SWITCHED CAP DBL INV 8DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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