参数资料
型号: LT3080EST#PBF
厂商: Linear Technology
文件页数: 16/28页
文件大小: 0K
描述: IC REG LDO ADJ 1.1A SOT223-3
产品培训模块: LT3080 Linear Voltage Regulator
More Information on LDOs
特色产品: LT3080
标准包装: 78
稳压器拓扑结构: 正,可调式
输出电压: 可调至 36V
输入电压: 1.2 V ~ 36 V
电压 - 压降(标准): 1.35V @ 1.1A
稳压器数量: 1
电流 - 输出: 1.1A
电流 - 限制(最小): 1.1A
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: TO-261-4,TO-261AA
供应商设备封装: SOT-223
包装: 管件
产品目录页面: 1331 (CN2011-ZH PDF)
LT3080
APPLICATIONS INFORMATION
= 0.36A
1A –
R P =
= 3.65 ?
The second technique for reducing power dissipation,
shown in Figure 9, uses a resistor in parallel with the
LT3080. This resistor provides a parallel path for current
flow, reducing the current flowing through the LT3080.
This technique works well if input voltage is reasonably
constant and output load current changes are small. This
technique also increases the maximum available output
current at the expense of minimum load requirements.
As an example, assume: V IN = V CONTROL = 5V, V IN(MAX) =
5.5V, V OUT = 3.3V, V OUT(MIN) = 3.2V, I OUT(MAX) = 1A and
I OUT(MIN) = 0.7A. Also, assuming that R P carries no more
than 90% of I OUT(MIN) = 630mA.
Calculating R P yields:
5.5V – 3.2V
0.63A
(5% Standard value = 3.6Ω)
The maximum total power dissipation is (5.5V – 3.2V) ?
1A = 2.3W. However the LT3080 supplies only:
5.5V – 3.2V
3.6 ?
Therefore, the LT3080’s power dissipation is only:
P DIS = (5.5V – 3.2V) ? 0.36A = 0.83W
R P dissipates 1.47W of power. As with the first technique,
choose appropriate wattage resistors to handle and dis-
sipate the power properly. With this configuration, the
LT3080 supplies only 0.36A. Therefore, load current can
increase by 0.64A to 1.64A while keeping the LT3080 in
its normal operating range.
C1
V CONTROL
LT3080
+
IN
R P
V IN
SET
R SET
OUT
V OUT
C2
3080 F09
Figure 9. Reducing Power Dissipation Using a Parallel Resistor
3080fc
16
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LT3080ET#PBF 功能描述:IC REG LDO ADJ 1.1A TO220-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正,固定式 输出电压:8V 输入电压:10.5 V ~ 23 V 电压 - 压降(标准):1.7V @ 40mA 稳压器数量:1 电流 - 输出:100mA(最小值) 电流 - 限制(最小):- 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC(0.154",3.90mm 宽) 供应商设备封装:8-SOIC 包装:剪切带 (CT) 产品目录页面:1075 (CN2011-ZH PDF) 其它名称:296-24390-1