参数资料
| 型号： | SPX1587T-L-1-5/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.5V 3A TO263-3 |
| 标准包装： | 500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.5V |
| 输入电压： | 最高 10V |
| 电压 - 压降（标准）： | 1.1V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3.2A |
| 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 1 5 8 7
3 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
thermal resistance of the SPX1587. The actual
thermal resistance can be determined with
experimentation.
The SPX1587 power dissipation is calculated
as follows:
Maximum Junction Temperature range:
Where θ JA is the junction-to-ambient thermal
resistance of the package.
Maximum junction temperature must not
exceed 125°C.
R IPPLE R EJECTION
Ripple rejection can be improved by adding a
capacitor between the ADJ pin and ground as
shown in Figure 11. When ADJ pin bypassing
is used, the value of the output capacitor
required increases to its maximum. If the ADJ
pin is not bypassed, the value of the output
capacitor can be lowered to 22 μ F for an
electrolytic aluminum capacitor or 10 μ F for a
solid tantalum capacitor (Fig 10).
However the value of the ADJ-bypass
capacitor should be chosen with respect to the
following equation:
If an ADJ-bypass capacitor is used, the
amplitude of the output ripple will be
independent of the output voltage. If an ADJ-
bypass capacitor is not used, the output ripple
will be proportional to the ratio of the output
voltage to the reference voltage:
Where
M = multiplier for the ripple seen when the
ADJ pin is optimally bypassed.
V REF =1.25V
Ripple rejection for the adjustable version is
showing in Figure 8.
O UTPUT V OLTAGE
The output of the adjustable regulator can be
set to any voltage between 1.25V and 15V.
The value of V OUT can be quickly approximated
using the formula
1.25
Small correction to this formula is required de-
pending on the values of resistors R1 and R2,
since the adjustable pin current (approx 50 μ A)
flows through R2. When I ADJ is taken into
account, the formula becomes
1
6.28
1
Where
V REF =1.25V
Where
C = value of the capacitor in Farads (select an
equal or larger standard value)
F R = ripple frequency in Hz
R 1 = value of resistor R1 in Ohms.
L AYOUT C ONSIDERATIONS
Parasitic line resistance can degrade load
regulation. In order to avoid this, connect R1
directly to V OUT as illustrated in Figure 13. For
the same reason, R2 should be connected to
the negative side of the load.
? 2010 Exar Corporation
6/11
Rev. 2.0.0
相关PDF资料 |
PDF描述 |
|---|---|
| GSC35DRES-S93 | CONN EDGECARD 70POS .100 EYELET |
| SPX1587T-L/TR | IC REG LDO ADJ 3A TO263-3 |
| SPX1587AT-L-2-5/TR | IC REG LDO 2.5V 3A TO263-3 |
| GMC35DRES-S93 | CONN EDGECARD 70POS .100 EYELET |
| SPX1587AT-L/TR | IC REG LDO ADJ 3A TO263-3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SPX1587T-L-2-5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SPX1587T-L-3-3 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SPX1587T-L-5-0 | 功能描述:低压差稳压器 - LDO 3A LOW DROPOUT 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 |
| SPX1587T-L-5-0/TR | 功能描述:低压差稳压器 - LDO 3A LOW DROPOUT 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 |
| SPX1587T-TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
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