参数资料
| 型号： | NCV8512PW50R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .15A 16-SOIC |
| 产品变化通告： | Product Obsolescence 24/Jan/2011 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 45 V |
| 电压 - 压降（标准）： | 0.4V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 151mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCV8512PW50R2GOSCT |
NCV8512
2. After a reset event has occurred and the device is
back in regulation. The DELAY capacitor is
discharged when the regulation (RESET threshold)
has been violated. When the DELAY capacitor
trip point can be programmed externally using a resistor
divider to the input monitor (MON) (Figure 13). The typical
threshold is 1.20 V on the MON Pin.
V IN
discharges to 0.45 V, the RESET signal pulls low.
FLAG/Monitor Function
An on ? chip comparator is available to provide an early
warning to the microprocessor of a possible reset signal. The
reset signal typically turns the microprocessor off
instantaneously. This can cause unpredictable results with
the microprocessor. The signal received from the FLAG pin
V BAT
R M1
R M2
V OUT
NCV8512
MON FLAG
R ADJ RESET
Delay GND
R FLG
R RST
C OUT
V CC
m P
I/O
RESET
will allow the microprocessor time to complete its present
task before shutting down. This function is performed by a
comparator referenced to the bandgap voltage. The actual
APPLICATION NOTES
Figure 13. FLAG/Monitor Function
tDELAY + + 6.45 ms
FLAG MONITOR
Figure 14 shows the FLAG Monitor waveforms taken
from the circuit depicted in Figure 13. As the output voltage
falls (V OUT ), the Monitor threshold is crossed. This causes
the voltage on the FLAG output to go low sending a warning
signal to the microprocessor that a RESET signal may occur
in a short period of time. T WARNING is the time the
microprocessor has to complete the function it is currently
working on and get ready for the RESET shutdown signal.
V OUT
MON
FLAG Monitor
Ref. Voltage
RESET
FLAG
Use the typical value for V DT = 1.8 V.
Use the typical value for Delay Charge Current = 9.0 m A.
33 nF(1.8 * 0.04 V)
9.0 m A
STABILITY CONSIDERATIONS
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: startup delay,
load transient response and loop stability.
The capacitor value and type should be based on cost,
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
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
manufacturer ’s data sheet usually provides this information.
The value for the output capacitor C OUT shown in Figure 15
should work for most applications, but is not necessarily the
optimized solution.
V IN
V OUT
T WARNING
Figure 14. FLAG Monitor Circuit Waveform
C IN *
0.1 m F
NCV8512
RESET
R RST
C OUT **
10 m F
SETTING THE DELAY TIME
The delay time is controlled by the Reset Delay Low
Voltage, Delay Switching Threshold, and the Delay Charge
tDELAY +
Current. The delay follows the equation:
CDELAY(VDT * Reset Delay Low Voltage)
Delay Charge Current
Example:
Using C DELAY = 33 nF.
Use the typical value for Delay Low Voltage = 0.04 V.
*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 15. Test and Application Circuit Showing
Output Compensation
http://onsemi.com
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相关代理商/技术参数 |
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|---|---|
| NCV8518 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
| NCV8518A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Low Dropout Linear Regulator with Watchdog, Wake Up, RESET, and ENABLE |
| NCV8518APDG | 功能描述:低压差稳压器 - LDO LINEAR VLT REGULATOR 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 |
| NCV8518APDR2G | 功能描述:低压差稳压器 - LDO LINEAR VLT REGULATOR 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 |
| NCV8518APWG | 功能描述:低压差稳压器 - LDO LINEAR VLT REGULATOR 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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