参数资料
| 型号： | NCP5212AMNTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-QFN |
| 标准包装： | 1 |
| 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： | 16-VQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | NCP5212AMNTXGOSDKR |
NCP5212A, NCP5212T
Once the large transient occurs, the COMP signal may be
large enough to exceed the threshold and then TRE “flag”
signal will be asserted in a short period which is typically
around one normal switching cycle. In this short period, the
controller will be running at high frequency and hence has
faster response. After that the controller comes back to
normal switching frequency operation. We can program the
internal TRE threshold (TRE_TH). For detail please see the
electrical table of “TRE Setting” section. Basically, the
recommend internal TRE threshold value is around 1.5
times of peak ? to ? peak value of the COMP signal at CCM
operation. The higher the internal TRE_TH, the lower
Adaptive Voltage Positioning (AVP)
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 20.
sensitivity to load transient. The TRE function can be
disable by setting the Rtre which is connecting to DL/TRE
pin to less than 25 k W . For system component saving, it is
usually set as default value, that is, Rtre is open ( w 75 k W )
and internal TRE_TH is 300 mV typical.
Vo With AVP
Vo Without AVP
Figure 20. Adaptive Voltage Positioning
Vo
Rt
Rb
FB
+
COMP
+ Vref
Rocp
IDRP/OCP
?
IDRP
L
Rs1
CS+
Top to Bottom SWN, Vo, Transient Signal
Figure 18. Transient Response with TRE Disable
DCR
Cs
Rs2
CS ?
+
Gi
Figure 21. Configuration for AVP Function
The Figure 21 shows how to realize the AVP function. A
current path is connecting to the FB pin via Rocp resistor.
Rocp is not actually for AVP function, indeed, Rocp 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 V o with AVP is:
V O + V O 0 * I O * R LL
(eq. 1)
V O 0 + 1 )
* V ref
Rt
Top to Bottom SWN, Vo, Transient Signal
Figure 19. Transient Response with TRE Enable
Where I o is the load current, no load output voltage V o 0 is
set by the external divider that is:
(eq. 2)
Rb
http://onsemi.com
13
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| NCP5212T | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Single Synchronous Step-Down Controller |
| NCP5212TMNTXG | 功能描述:DC/DC 开关控制器 SYNC STEP DOWN CONTROLLER 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 |
| NCP5214 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2-in-1 Notebook DDR Power Controller |
| NCP5214A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2−in−1 Notebook DDR Power Controller |
| NCP5214AMNR2G | 功能描述:DC/DC 开关控制器 OSPI 2 IN 1 NTEBOOK 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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