参数资料
| 型号： | SPX2815AT-L |
| 厂商： | Exar Corporation |
| 文件页数： | 4/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 1.5A TO263-3 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.25 V ~ 15 V |
| 输入电压： | 2.5 V ~ 10 V |
| 电压 - 压降（标准）： | 1.1V @ 1.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.5A |
| 电流 - 限制（最小）： | 2.5A |
| 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： | 管件 |
APPLICATION INFORMATION: Continued
Ripple Rejection
Ripple rejection can be improved by adding a
capacitor between the ADJ pin and ground as
shown in Figure 8. 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 7). However, the value of the ADJ-bypass
capacitor should be chosen with respect to the
Ripple rejection for the adjustable version is
shown in Figure 5.
Output Voltage
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
V OUT =1.25 *(R 1 + R 2 )/R 1
following equation:
A small correction to this formula is required
C=
Where
_______1______-_
( 6.28 * F R * R 1 )
depending on the values of resistors R 1 and R 2 ,
since the adjustable pin current (approx 50 μ A)
flows through R 2 . When I ADJ is taken into ac-
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.
count, the formula becomes
V OUT = V REF (1+ (R 2 /R 1 )) + I ADJ * R 2
where
V REF =1.25V
If an ADJ-bypass capacitor is used, the ampli-
tude 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:
M = V OUT / V REF
Layout Considerations
Parasitic line resistance can degrade load regu-
lation. In order to avoid this, connect R 1 directly
to V OUT as illustrated in Figure 13. For the same
reason, R 2 should be connected to the negative
side of the load.
Where M = multiplier for the ripple seen when
the ADJ pin is optimally bypassed.
V REF =1.25V
0
-10
-20
-30
-40
-50
V IN
4.7 μ F +
C 1
IN
SPX2815
OUT
C 2
V OUT
-60
-70
ADJ
R 1
-80
-90
10
100
1000
10000
100000
1000000
I OUT =
V REF
R 1
LOAD
I OUT
Frequency, Hz
Figure 5. Ripple Rejection; Vin=3.3V, Vout=1.8V (adj.),
Iload=200mA
Figure 6. Current Source
Date: 6/21/06 Rev C
SPX2815 1.5A Low Dropout Voltage Regulator
4
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SPX2815AT-L/TR | 功能描述:低压差稳压器 - LDO 1.5A 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 |
| SPX2815AT-L-2-5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SPX2815AT-L-3-3 | 功能描述:低压差稳压器 - LDO 1.5A 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 |
| SPX2815AT-L-3-3/TR | 功能描述:低压差稳压器 - LDO 1.5A 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 |
| SPX2815AU | 制造商:Exar Corporation 功能描述: |
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