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参数资料
| 型号： | NCV8503PW25R2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V .4A 16SOIC |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 1,000 |
| 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： | 16-SOIC（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
| 其它名称： | NCV8503PW25R2OS |
NCV8503 Series
Voltage Adjust
Figure 19 shows the device setup for a user configurable
output voltage. The feedback to the V ADJ pin is taken from
a voltage divider referenced to the output voltage. The loop
is balanced around the Unity Gain threshold (1.30 V
typical). JEDEC standard JESD78 requires ? 100 mA trigger
test conditions. V ADJ conforms to ? 75 mA test conditions.
V OUT
NCV8503
V ADJ
15 k
1.28 V
5.1 k
≈ 5.0 V
C OUT
Figure 19. Adjustable Output
Voltage
APPLICATION NOTES
FLAG MONITOR
Figure 20 shows the FLAG Monitor waveforms as a result
of the circuit depicted in Figure 18. As the input voltage falls
(V MON ), the Monitor threshold is crossed. This causes the
voltage on the FLAG output to go low.
V MON
MON
Flag Monitor
Ref. Voltage
FLAG
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,
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
manufacturers data sheet usually provides this information.
The value for the output capacitor C OUT shown in Figure 21
should work for most applications, however it is not
necessarily the optimized solution.
V IN
V OUT
Figure 20. FLAG Monitor Circuit Waveform
C IN *
0.1 m F
NCV8503
RESET
R RST
C OUT **
33 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.
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.
*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 21. Test and Application Circuit Showing
Output Compensation
tDELAY +
33 nF(1.8 * 0)
4.2 m A
+ 14 ms
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8503PW25R2G | 功能描述:低压差稳压器 - LDO 2.5V 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 |
| NCV8503PW33 | 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 |
| NCV8503PW33G | 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 |
| NCV8503PW33R2 | 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 |
| NCV8503PW33R2G | 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 |
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