参数资料
型号: NCP5322ADWR2
厂商: ON Semiconductor
文件页数: 23/31页
文件大小: 0K
描述: IC CTRLR BUCK 2PH STEPDWN 28SOIC
产品变化通告: Product Obsolescence 11/Feb/2009
标准包装: 1
应用: 控制器,高性能处理器
输入电压: 4.5 V ~ 14 V
输出数: 2
输出电压: 3.3V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
供应商设备封装: 28-SOIC
包装: 剪切带 (CT)
其它名称: NCP5322ADWR2OSCT
NCP5322A
voltage increase at the V DRP pin at full?load ( D V DRP ), the
designer must consider the output inductor ’s resistance
(R L ), the PCB trace resistance between the current sense
points (R PCB ), and the controller IC’s gain from the current
sense to the V DRP pin (G VDRP ):
D V OUT,FULL?LOAD is the full?load voltage reduction
from the VID (DAC) setting. D V OUT,FULL?LOAD is not the
voltage change from the no?load AVP setting.
7. Current Sensing
D VDRP
(IBIASVFB ) D VOUT,FULL?LOAD RFBK1)
RCSn @ CCSn + Lo (RL ) RPCB)
D VDRP + IO,MAX @ (RL ) RPCB) @ GVDRP
The value of R DRP can then be calculated:
RDRP +
(30)
(31)
For inductive current sensing, choose the current sense
network (R CSn , C CSn , n = 1 or 2) to satisfy
(32)
R CS1
L1
I MAX /2
C CS1
CS1
+
?
G VDRP
Σ
COMP
Error
Amp
+?
VID Setting
IBIAS VFB
L2
R CS2
CS2
+
?
G VDRP
R DRP
V DRP = VID + V FB = VID
I MAX ? R L ? G VDRP
R VFBK
V CORE
I MAX /2
C CS2
I DRP
I FBK
CS REF
I DRP = I MAX ? R L ? G VDRP /R DRP
I FBK = I DRP ? IBIAS VFB
V CORE = VID ? (I DRP ? IBIAS VFB ) w R VFBK
= VID ? I MAX w R L w G VDRP w R FBK /R DRP + IBIAS VFB w R FBK
Figure 19. AVP Circuitry at Full?Load
Figure 20. V DRP Tuning Waveforms. The RC Time
Constant of the Current Sense Network Is Too Long
(Slow): V DRP and V OUT Respond Too Slowly.
Figure 21. V DRP Tuning Waveforms. The RC Time
Constant of the Current Sense Network Is Too Short
(Fast): V DRP and V OUT Both Overshoot.
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