参数资料
| 型号： | NCP5331FTR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 29/36页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM 2PH W/DRVRS 32-LQFP |
| 产品变化通告： | Product Obsolescence 05/Oct/2010 |
| 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： | NCP5331FTR2GOSCT |
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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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