参数资料
型号: NCP5331FTR2
厂商: ON Semiconductor
文件页数: 35/36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
VILIM + (IOUT,LIM ) D ILo 2) @ (RLMAX ) RPCB,MAX)
5 V REF
@ GILIM
R LIM1
V LIM
To I LIM Pin
+ (72 A ) 7.20 A 2) @ (1.28 m W ) 0.26 m W )
@ 12 V V
+ 1.4 Vdc
Set the voltage at the I LIM pin using a resistor divider from
the 5.0 V reference output as shown in Figure 42. If the
resistor from I LIM to GND is chosen to be 910 W (R LIM2 ),
then the resistor from I LIM to 5.0 V REF can be calculated
from
RLIM1 + (VREF * VILIM) (VILIM RLIM2)
+ (5.0 V * 1.4 V) (1.4 V 910 W )
+ 2340 W or 2.37 k W
10. Overcurrent Timer
To set the overcurrent timer, solve Equation 35 for C OVC
and substitute t OVC = 120 ms.
R LIM2
910
Figure 42. Setting the Current Limit
Then calculate the steady?state COMP voltage.
VCOMP + VOUT @ 0 A ) Channel_Startup_Offset
) Int_Ramp ) GCSA @ Ext_Ramp 2
+ 1.225 V ) 0.60 V ) 0.102 @ 250 mV
) 4.0 V V @ 5.3 mV 2
+ 1.86 V
Finally, solve Equation 35 for the soft?start capacitor,
C C2 , and substitute as required.
CC2 + (tSS @ ICOMP) (VCOMP * RC1 @ ICOMP) (36)
COVC + tOVC (5.5
+ 120 ms (5.5
105)
105)
(35)
+ (6 ms @ 30 m A) (1.86 V * 7.5 k W @ 30 m A)
+ 0.11 m F or 0.1 m F
(VIN * VOUT)
(RSx @ CSx @ fSW)
+ 0.102 @
CPGD + tPGD @ IPGD (PGDTHRESH * PGDMIN)
+ 0.218 m F or 0.22 m F
11. Soft Start Time
To set the Soft Start time, first calculate the external ramp
size at a duty?cycle of D = 1.225 V/12 V = 0.102.
Ext_Ramp + D @
(12 V * 1.225 V)
(10.0 k W @ 0.1 m F @ 200 kHz)
+ 5.5 mV
12. Power Good Delay Time
First, use the previously derived value for R OSC to
calculate the current that will be supplied to the C PGD
capacitor.
IPGD + 0.52 V ROSC
+ 0.52 V 51 k W
+ 10.2 m A
Next, solve equation 37 for C PGD and substitute as
required.
(37)
+ 6 ms @ 10.2 m A (3.0 V * 0.25 V)
+ 0.022 m F
http://onsemi.com
35
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