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参数资料
| 型号： | NCV8505D2T25R4G |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V .4A D2PAK-7 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.5V |
| 输入电压： | 最高 45 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 400mA |
| 电流 - 限制（最小）： | 425mA |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-8，D²Pak（7 引线+接片），TO-263CA |
| 供应商设备封装： | D2PAK-7 |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCV8505D2T25R4GOSCT |
NCV8505 Series
APPLICATION NOTES
tDELAY +
tDELAY + + 14 ms
T
R q JA + 150 C * A
PD
SETTING THE DELAY TIME
The delay time is controlled by the Reset Delay Low
Voltage, Delay Switching Threshold, and the Delay Charge
Current. The delay follows the equation:
CDELAY(Vdt * Reset Delay Low Voltage)
Delay Charge Current
Example:
Using C DELAY = 33 nF.
Assume reset Delay Low Voltage = 0.
Use the typical value for V dt = 1.8 V (2.5 V, 3.3 V, and
5.0 V options).
Use the typical value for Delay Charge Current = 4.2 m A.
33 nF(1.8 * 0)
4.2 m A
STABILITY CONSIDERATIONS
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start ? up
delay, load transient response and loop stability.
The capacitor value and type should be based on cost,
PD(max) + [VIN(max) * VOUT(min)] IOUT(max) (1)
) VIN(max)IQ
where:
V IN(max) is the maximum input voltage,
V OUT(min) is the minimum output voltage,
I OUT(max) is the maximum output current for the
application, and
I Q is the quiescent current the regulator consumes at
I OUT(max) .
Once the value of P D(max) is known, the maximum
permissible value of R q JA can be calculated:
o
(2)
The value of R q JA can then be compared with those in the
package section of the data sheet. Those packages with
R q JA ’s less than the calculated value in equation 2 will keep
the die temperature below 150 ° C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
availability, size and temperature constraints. A tantalum or
aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR can cause
instability. The aluminum electrolytic capacitor is the least
V IN
I IN
SMART
REGULATOR ?
I OUT
V OUT
expensive solution, but, if the circuit operates at low
temperatures ( ? 25 ° C to ? 40 ° C), both the value and ESR of
the capacitor will vary considerably. The capacitor
manufacturers data sheet usually provides this information.
The value for the output capacitor C OUT shown in Figure 18
should work for most applications, however it is not
necessarily the optimized solution.
Control
} Features
I Q
Figure 19. Single Output Regulator with Key
Performance Parameters Labeled
V IN
V OUT
HEAT SINKS
A heat sink effectively increases the surface area of the
C IN *
0.1 m F
NCV8505
RESET
R RST
C OUT **
33 m F
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed to
determine the value of R q JA :
R q JA + R q JC ) R q CS ) R q SA
*C IN required if regulator is located far from the power supply
filter.
**C OUT required for stability. Capacitor must operate at minimum
temperature expected.
Figure 18. Test and Application Circuit Showing
Output Compensation
CALCULATING POWER DISSIPATION IN A
SINGLE OUTPUT LINEAR REGULATOR
The maximum power dissipation for a single output
regulator (Figure 19) is:
(3)
where:
R q JC = the junction ? to ? case thermal resistance,
R q CS = the case ? to ? heatsink thermal resistance, and
R q SA = the heatsink ? to ? ambient thermal resistance.
R q JC appears in the package section of the data sheet. Like
R q JA , it too is a function of package type. R q CS and R q SA are
functions of the package type, heatsink and the interface
between them. These values appear in heat sink data sheets
of heat sink manufacturers.
http://onsemi.com
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8505D2T33 | 功能描述:低压差稳压器 - LDO 3.3V 400mA w/ENABLE 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 |
| NCV8505D2T33G | 功能描述:低压差稳压器 - LDO MICROPOWER 400 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 |
| NCV8505D2T33R4 | 功能描述:低压差稳压器 - LDO 3.3V 400mA w/ENABLE 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 |
| NCV8505D2T33R4G | 功能描述:低压差稳压器 - LDO MICROPOWER 400 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 |
| NCV8505D2T50 | 功能描述:低压差稳压器 - LDO 5.0V 400mA w/ENABLE 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 |
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