参数资料
| 型号： | NCP5217AMNTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 14-QFN |
| 标准包装： | 3,000 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 电源电压： | 4.5 V ~ 27 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 14-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP5217AMNTXG-ND NCP5217AMNTXGOSTR |
NCP5217A
The Figure 18 shows how to realize the AVP function. A
current path is connecting to the FB pin via R ocp resistor.
Rocp is not actually for AVP function, indeed, R ocp is used
for OCP threshold value programming. The IDRP/OCP pin
has dual functions: OCP programming and AVP. At the
IDRP/OCP pin, conceptually there is a current source which
is modulated by current sensing amplifier.
The output voltage Vo with AVP is:
V O + V O 0 * I O * R LL
(eq. 1)
Where I o is the load current, no load output voltage Vo0 is
set by the external divider that is
Top to Bottom SWN, V o , Transient Signal
V O 0 + 1 )
Rt
Rb
* V ref
(eq. 2)
Figure 16. Transient Response with TRE Enable
The load line impendence R LL is given by:
Adaptive Voltage Positioning (AVP)
R LL + DCR * Gain_CS * Rt *
Rs2
Rs1 ) Rs2
(eq. 3)
For applications with fast transient currents, adaptive
voltage positioning can reduce peak ? to ? peak output voltage
deviations due to load transients. With the use of AVP, the
output voltage allows to have some controlled sag when load
current is applied. Upon removal of the load, the output
voltage returns no higher than the original level, just
allowing one output transient peak to be cancelled over a
load step up and release cycle. The amount of AVP is
adjustable.
The behaviors of the V o waveforms with or without AVP
are depicted at Figure 17.
Where DCR is inductor DC resistance. Gain_CS is a gain
from [(CS+) ? (CS ? )] to IDRP Gain (At electrical table, the
symbol is IDRP_GAIN), the typical value is 0.525 m A/mV.
The AVP function can be easily disable by shorting the
Rocp resistor into ground.
From the equation we can see that the value of “top”
resistor Rt can affect the R LL , so it is recommended to define
the amount of R LL FRIST before defining the compensation
component value. And if the user wants to fine tune the
compensation network for optimizing the transient
performance, it is NOT recommend to adjust the value of Rt.
Otherwise, both transient performance and AVP amount
will be affected. The following diagram shows the typical
waveform of AVP. Note that the Rt typical value should be
above 1 k W .
Vo With AVP
Vo Without AVP
Figure 17. Adaptive Voltage Positioning
Vo
Rt
Rb
FB
+
COMP
? Vref
Rocp
IDRP/OCP
+
IDRP
DCR
L
Rs1
Cs
CS+
Rs2
CS ?
+
Gi
Top to Bottom: SWN, V o , Transient Signal (0.5 ? 10 ? 0.5A)
Figure 19. Typical waveform of AVP
Figure 18. Configuration for AVP function
http://onsemi.com
10
相关PDF资料 |
PDF描述 |
|---|---|
| NCP5218MNR2G | IC DDR PWR CTLR 2IN2 NTBK 22-DFN |
| NCP5220MNR2G | IC CTLR PWM DUAL BUCK PWR 20-DFN |
| NCP5222MNR2G | IC CTLR BUCK 2CH 2PH 28QFN |
| NCP5252MNTXG | IC REG BUCK SYNC ADJ 2A 16QFN |
| NCP5314FTR2G | IC CTLR CPU 2/3/4 PHASE 32-LQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5218 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2−in−1 Notebook DDR Power Controller |
| NCP5218MNR2G | 功能描述:电压模式 PWM 控制器 2IN1 NOTEBK DDR CNTL RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| NCP5220 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:3−in−1 PWM Dual Buck and Linear Power Controller |
| NCP5220AMNR2 | 功能描述:DC/DC 开关控制器 3-in-1 PWM Dual Buck 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 |
| NCP5220AMNR2G | 功能描述:DC/DC 开关控制器 ANA DDR PWER CNTRLR 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 |
发布紧急采购，3分钟左右您将得到回复。