参数资料
| 型号： | SPX3940AT-L-3-3/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V 1A TO263-3 |
| 标准包装： | 500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 16V |
| 电压 - 压降（标准）： | 0.28V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A |
| 电流 - 限制（最小）： | 1.5A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-4，D²Pak（3 引线+接片），TO-263AA |
| 供应商设备封装： | TO-263-3 |
| 包装： | 带卷 (TR) |
S P X 3 9 4 0
1 A L o w D r o p o u t V o l t a g e R e g u l a t o r
THEORY OF OPERATION
The SPX3940 incorporates protection against
over-current faults, reversed load insertion,
over temperature operation, and positive and
negative transient voltage.
T HERMAL C ONSIDERATIONS
Although the SPX3940 offers limiting circuitry
for overload conditions, it is still necessary to
insure that the maximum junction
temperature is not exceeded in the
application. Heat will flow through the lowest
resistance path, the junction-to-case path. In
order to insure the best thermal flow of the
component, proper mount-ing is required.
Consult heatsink manufacturer for thermal
resistance and design of heatsink.
TO-220 Design Example:
Assume that V IN = 10V, V OUT = 5V,
I OUT = 1.5A, T A = 50°C/W, θ HA = 1°C/W,
θ CH = 2°C/W, and θ JC = 3°C/W.
Where T A = ambient temperature
θ HA = heatsink to ambient thermal resistance
θ CH = case to heatsink thermal resistance
θ JC = junction to case thermal resistance
The power calculated under these conditions
is:
P D = (V IN – V OUT ) * I OUT = 7.5W.
And the junction temperature is calculated as
T J = T A + P D * (θ HA + θ CH + θ JC ) or
T J = 50 + 7.5 * (1 + 2 + 3) = 95°C
Reliable operation is insured.
C APACITOR R EQUIREMENTS
The output capacitor is needed to insure
stability and minimize the output noise. The
value of the capacitor varies with the load.
However, a minimum value of 10μF aluminum
capacitor will guarantee stability over all load
conditions. A tantalum capacitor is
recommended if a faster load transient
response is needed.
If the power source has a high AC impedance,
a 0.1μF ceramic capacitor between input &
ground is recommended.
M INIMUM L OAD C URRENT
To ensure a proper behavior of the regulator
under light load, a minimum load of 5mA for
SPX3940 is required.
Fig. 20: Fixed Output Linear Regulator
? 2012 Exar Corporation
8/11
Rev. 1.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SPX3940AT-L-5-0 | 功能描述:低压差稳压器 - LDO 1.0A LW DROPOUT VLT 1.5A PEAK OUTPT CURR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| SPX3940AT-L-5-0/TR | 功能描述:低压差稳压器 - LDO 1.0A LW DROPOUT VLT 1.5A PEAK OUTPT CURR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| SPX3940AT-L-5-0TR | 制造商:EXAR 制造商全称:EXAR 功能描述:1A Low Dropout Voltage Regulator |
| SPX3940AU | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:1A Low Drop Out Voltage Regulator |
| SPX3940AU-1.8 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:1A Low Dropout Voltage Regulator Fixed Output, Fast Response |
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