参数资料
型号: NCP5331FTR2
厂商: ON Semiconductor
文件页数: 29/36页
文件大小: 0K
描述: IC CTRLR BUCK 2PH PWM DRV 32LQFP
产品变化通告: Product Obsolescence 11/Feb/2009
标准包装: 1
应用: 控制器,AMD Athlon?
输入电压: 9 V ~ 14 V
输出数: 2
输出电压: 5V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 32-LQFP
供应商设备封装: 32-LQFP(7x7)
包装: 剪切带 (CT)
其它名称: NCP5331FTR2OSCT
NCP5331
R S1
L1
I MAX /2
C S1
CS1
+
?
G VDRP
Σ
COMP
Error
Amp
+?
VID Setting
IBIAS VFB
L2
R S2
CS2
+
?
G VDRP
R DRP
V DRP = VID + V FB = VID
I MAX ? R L ? G VDRP
R F1
V CORE
I MAX /2
C S2
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 F1
Figure 34. AVP Circuitry at Full?Load
7. Current Sensing
For inductive current sensing, choose the current sense
network (RSx, CSx) to satisfy
RSx @ CSx + Lo (RL ) RPCB)
(32)
For resistive current sensing, choose the current sense
network (RSx, CSx) to satisfy
RSx @ CSx + Lo (Rsense)
(33)
This will provide an adequate starting point for RSx and
CSx. After the converter is constructed, the value of RSx
(and/or LSx) should be fine?tuned in the lab by observing
the V DRP signal during a step change in load current. Tune
the RSx ? CSx network to provide a “square?wave” at the
V DRP output pin with maximum rise time and minimal
NOTE:
The RC time constant of the current sense network is
overshoot as shown in Figures 34 ? 36.
too long (slow); V DRP and V CORE respond too slowly.
Figure 35. V DRP Tuning, RC Time Too Long
NOTE:
The RC time constant of the current sense network is
NOTE:
The RC time constant of the current sense network is
optimal; V DRP and V CORE respond to the load current
too short (fast); V DRP and V CORE both overshoot.
Figure 36. V DRP tuning, RC Time Too Short
http://onsemi.com
29
quickly without overshooting.
Figure 37. V DRP Tuning, RC Time Optimal
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