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参数资料
| 型号： | NCP623MN-50R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .15A 6-DFN |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 12V |
| 电压 - 压降（标准）： | 0.18V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 175mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-VDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN（3x3） |
| 包装： | 带卷 (TR) |
NCP623
NCP623 Wake ? up Improvement ? In portable
applications, an immediate response to an enable signal is
vital. If noise is not a concern, the NCP623 without a bypass
capacitor settles in nearly 20 m s and typically delivers
65 m VRMS between 100 Hz and 100 kHz.
In ultra low ? noise systems, the designer needs a 10 nF
bypass capacitor to decrease the noise down to 25 m VRMS
between 100 Hz and 100 kHz. With the addition of the 10 nF
capacitor, the wake ? up time expands up to 1.0 ms as shown
on the data ? sheet curves. If an immediate response is
wanted, Figure 5 provides a solution to charge the bypass
capacitor with the enable signal without degrading the noise
response of the NCP623.
At power ? on, C4 is discharged. When the control logic
sends its wake ? up signal by going high, the PNP base is
momentarily tied to ground. The PNP switch closes and
immediately charges the bypass capacitor C1 toward its
operating value. After a few m s, the PNP opens and becomes
totally transparent to the regulator.
This circuit improves the response time of the regulator
which drops from 1.0 ms down to 30 m s. The value of C4
needs to be tweaked in order to avoid any bypass capacitor
overload during the wake ? up transient.
C4
470 pF
MMBT2902LT1
Q1
C1
10 nF
Output
8
7
6
5
Input
R2
220 k
+
C2
1.0 m F
NCP623
+
C3
1.0 m F
On/Off
C3
1.0 m F
+
6
1
5
NCP623
2
4
3
C2
+ 1.0 m F
C1
10 nF
1
2
3
4
On/Off
R2
220 k
MMBT2902LT1
Q1
C4
470 pF
Input
Output
Figure 4. A PNP Transistor Drives the
Bypass Pin when Enable Goes High (DFN6)
Figure 5. A PNP Transistor Drives the
Bypass Pin when Enable Goes High (Micro8)
http://onsemi.com
7
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| NCP6251MNR2G | 功能描述:DC/DC 开关控制器 2/3/4 PHASE EMI RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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| NCP629FC15T2G | 功能描述:低压差稳压器 - LDO HI PERFORMANCE CMOS 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 |
| NCP629FC18T2G | 功能描述:低压差稳压器 - LDO HI PERFORMANCE CMOS 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 |
| NCP629FC28T2G | 功能描述:低压差稳压器 - LDO HI PERFORMANCE CMOS 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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