参数资料
| 型号： | MIC29752WWT |
| 厂商： | Micrel Inc |
| 文件页数： | 20/25页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 7.5A TO247-5 |
| 标准包装： | 30 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.25 V ~ 26 V |
| 输入电压： | 最高 26V |
| 电压 - 压降（标准）： | 0.425V @ 7.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 7.5A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-247-5 |
| 供应商设备封装： | TO-247-5 |
| 包装： | 管件 |
| 产品目录页面： | 1107 (CN2011-ZH PDF) |
| 其它名称： | 576-1157 |
Micrel, Inc.
For example, given an expected maximum ambient
temperature (T A ) of 75 ° C with V IN = 3.3V, V OUT = 2.5V,
and I OUT = 1.5A, first calculate the expected P D using
Equation 3:
P D =(3.3V–2.5V)1.5A–(3.3V)(0.016A)=1.1472W
Eq. 3
Next, calcualte the junction temperature for the expected
power dissipation.
MIC29150/29300/29500/29750
Where the regulator is powered from a source with high
AC impedance, a 0.1μF capacitor connected between
Input and GND is recommended. This capacitor should
have good characteristics to above 250kHz.
Minimum Load Current
The MIC29150–29750 regulators are specified between
finite loads. If the output current is too small, leakage
currents dominate and the output voltage rises. The
following minimum load current swamps any expected
leakage current across the operating temperature range,
as shown in Table 2:
T J =( θ JA ×P D )+T A =(56 ° C/W×1.1472W)+75 ° C
=139.24 ° C
Eq. 4
Device
MIC29150
MIC29300
Minimum Load
5mA
7mA
Now determine the maximum power dissipation allowed
that would not exceed the IC’s maximum junction
MIC29500
MIC29750
10mA
10mA
temperature (125 ° C) without the useof a heat sink by:
Table 2. Minimum Load Currents
P D(MAX) = (T J(MAX) –T A )/ θ JA
= (125 ° C–75 ° C)/(56 ° C/W) = 0.893W
Capacitor Requirements
Eq. 5
Adjustable Regulator Design
The adjustable regulator versions, MIC29xx2 and
MIC29xx3, allow programming the output voltage
anywhere between 1.25V and the 25V. Two resistors are
used. The resistor values are calculated by Equation 6:
R 1 = R 2 × ? ? OUT ? 1 ? ?
For stability and minimum output noise, a capacitor on
the regulator output is necessary. The value of this
capacitor is dependent upon the output current; lower
currents allow smaller capacitors. The
? V ?
? 1.240 ?
Eq. 6
MIC29150/29300/29500/29750 regulators are stable
with the following minimum capacitor values at full load,
as noted in Table 1:
where V OUT is the desired output voltage. Figure 4 shows
component definition. Applications with widely varying
load currents may scale the resistors to draw the
Device
MIC29150
MIC29300
MIC29500
MIC29750
Full Load Capacitor
10μF
10μF
10μF
22μF
minimum load current required for proper operation (see
“Minimum Load Current” sub-section).
Table 1. Minimum Capacitor Values at Full Load
This capacitor need not be an expensive low ESR type:
aluminum electrolytics are adequate. In fact, extremely
low ESR capacitors may contribute to instability.
Tantalum capacitors are recommended for systems
where fast load transient response is important.
December 2012
20
M9999-122012-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2981/82BN | 功能描述:IC DRIVER ARRAY HV/HC 8CH 18DIP RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:50 系列:- 配置:高端 输入类型:非反相 延迟时间:200ns 电流 - 峰:250mA 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:600V 电源电压:12 V ~ 20 V 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-DIP 包装:管件 其它名称:*IR2127 |
| MIC2981/82BWM | 功能描述:闭锁 Hi-Voltage, Hi-Current Source Driver Array RoHS:否 制造商:Micrel 电路数量:1 逻辑类型:CMOS 逻辑系列:TTL 极性:Non-Inverting 输出线路数量:9 高电平输出电流: 低电平输出电流: 传播延迟时间: 电源电压-最大:12 V 电源电压-最小:5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-16 封装:Reel |
| MIC2981/82BWM TR | 功能描述:闭锁 Hi-Voltage, Hi-Current Source Driver Array RoHS:否 制造商:Micrel 电路数量:1 逻辑类型:CMOS 逻辑系列:TTL 极性:Non-Inverting 输出线路数量:9 高电平输出电流: 低电平输出电流: 传播延迟时间: 电源电压-最大:12 V 电源电压-最小:5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-16 封装:Reel |
| MIC2981/82YN | 功能描述:闭锁 Hi-Voltage, Hi-Current Source Driver Array - Lead Free RoHS:否 制造商:Micrel 电路数量:1 逻辑类型:CMOS 逻辑系列:TTL 极性:Non-Inverting 输出线路数量:9 高电平输出电流: 低电平输出电流: 传播延迟时间: 电源电压-最大:12 V 电源电压-最小:5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-16 封装:Reel |
| MIC2981/82YN | 制造商:Micrel Inc 功能描述:IC, SOURCE DRIVER ARRAY 8CH 500mA DIP-18 |
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