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參數(shù)資料
| 型號： | NCP5331FTR2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two-Phase PWM Controller with Integrated Gate Drivers |
| 中文描述： | 1.5 A SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封裝： | LEAD FREE, LQFP-32 |
| 文件頁數(shù)： | 35/36頁 |
| 文件大?。?/td> | 443K |
| 代理商： | NCP5331FTR2G |
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NCP5331
http://onsemi.com
35
VILIM
(IOUT,LIM
GILIM
ILo2)
(RLMAX
RPCB,MAX)
(72 A
7.20 A 2)
(1.28 m
0.26 m )
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 (R
LIM2
),
then the resistor from I
LIM
to 5.0 V
REF
can be calculated
from
RLIM1
(VREF
(5.0 V
VILIM) (VILIMRLIM2)
1.4 V) (1.4 V 910
)
2340
or
2.37 k
10. Overcurrent Timer
To set the overcurrent timer, solve Equation 35 for C
OVC
and substitute t
OVC
= 120 ms.
COVC
tOVC(5.5
105)
(35)
120 ms (5.5
0.218 F or
0.22 F
105)
11. Soft Start Time
To set the Soft Start time, first calculate the external ramp
size at a dutycycle of D = 1.225 V/12 V = 0.102.
Ext_Ramp
D
(VIN
(RSx
VOUT)
CSx
fSW)
0.102
(12 V
1.225 V)
0.1 F
(10.0 k
200 kHz)
5.5 mV
R
LIM2
910
R
LIM1
5 V
REF
To I
LIM
Pin
V
LIM
Figure 42. Setting the Current Limit
Then calculate the steadystate COMP voltage.
VCOMP
VOUT@ 0 A
Int_Ramp
Channel_Startup_Offset
GCSA
Ext_Ramp 2
1.225 V
4.0 V V
0.60 V
5.3 mV 2
0.102
250 mV
1.86 V
Finally, solve Equation 35 for the softstart capacitor,
C
C2
, and substitute as required.
CC2
(tSS
(6 ms
0.11 F or
0.1 F
ICOMP) (VCOMP
30 A) (1.86 V
RC1
7.5 k
ICOMP)
(36)
30 A)
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
10.2 A
Next, solve equation 37 for C
PGD
and substitute as
required.
CPGD
tPGD
6 ms
0.022 F
IPGD(PGDTHRESH
10.2 A (3.0 V
PGDMIN)
(37)
0.25 V)
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