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参数资料
| 型号： | NCV8675DS50GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCV8675DS50G |
| 设计资源： | NCV8675DS50GEVB Gerber Files NCV8675 EVB Schematic |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 输出电压： | 5V |
| 电流 - 输出： | 350mA |
| 输入电压： | 4.5 ~ 45 V |
| 稳压器类型： | 正，固定式 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCV8675 |
| 其它名称： | NCV8675DS50GEVBOS |
NCV8675
Calculating Power Dissipation
in a Single Output Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 36) is:
Heatsinks
A heatsink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
PD(max) + [Vin(max) * Vout(min)] Iout(max)
) VI(max)Iq
where
(1)
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
V in(max)
V out(min)
I out(max)
I q
is the maximum input voltage,
is the minimum output voltage,
is the maximum output current for the
application,
is the quiescent current the regulator
consumes at I Q(max) .
(3)
where
R q JC is the junction ? to ? case thermal resistance,
R q CS is the case ? to ? heatsink thermal resistance,
R q SA is the heatsink ? to ? ambient thermal resistance.
R q JA + 150 ° C * A
T
PD
Once the value of P D(max) is known, the maximum
permissible value of R q JA can be calculated:
(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.
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 heatsink data sheets
of heatsink manufacturers.
Thermal, mounting, and heatsinking considerations are
discussed in the ON Semiconductor application note
AN1040/D.
I in
I out
V in
SMART
REGULATOR ?
V out
Control
} Features
Iq
Figure 36. Single Output Regulator with Key
Performance Parameters Labeled
120
100
DPAK
100
80
60
40
D 2 PAK
DPAK 1 oz
DPAK 2 oz
1 oz
D 2 PAK 2 oz
10
1
D 2 PAK
Single Pulse
20
0
100
200
300
400
500
600
700
800
900
0.1
0.000001
0.0001
0.01
1
100
COPPER AREA (mm 2 )
Figure 37. JA vs. Copper Spreader Area
PULSE TIME (sec)
Figure 38. NCV8675 @ PCB Cu Area 100 mm 2
PCB Cu thk 1 oz
http://onsemi.com
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8675DS50R4G | 功能描述:低压差稳压器 - LDO NCV8675 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 |
| NCV8675DT33RKG | 功能描述:低压差稳压器 - LDO 3.3V/350MA LDO 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 |
| NCV8675DT50RKG | 功能描述:低压差稳压器 - LDO 350 mA VERY LOW QUIESCENT CURRENTLDO 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 |
| NCV8702 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:200 mA, Ultra-Low Quiescent Current, Ultra-Low Noise, LDO Linear Voltage Regulator |
| NCV8702MX18TCG | 功能描述:低压差稳压器 - LDO 200 MA LDO ULTRA-LOW IQ 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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