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參數(shù)資料
| 型號： | SC1144ABCSW |
| 廠商： | Semtech Corporation |
| 英文描述： | PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, PWM CONTROLLER |
| 中文描述： | 可編程，高性能多相，PWM控制器 |
| 文件頁數(shù)： | 3/11頁 |
| 文件大?。?/td> | 156K |
| 代理商： | SC1144ABCSW |
PROGRAMMABLE, HIGH PERFORMANCE
MULTI-PHASE, PWM CONTROLLER
SC1144
1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
Preliminary - August 24, 1999
3
The SC1144 is patent pending
ELECTRICAL CHARACTERISTICS (Cont.)
Unless otherwise noted: T
A
= 25
°
C, V
CC5V
= 5V, V
CC12V
= 12V, 4-Phase operation.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Bgout Voltage
V
Bgout
Vid = 00000
2.05
V
Bgout Impedance
R
O_Bg
3
K
External Clock Freq. Range
F
ext_CK
.80
8.0
8.5
MHz
Oscillator Frequency Accuracy
F
OSC
Iref = 250μA
7.2
8.0
8.8
MHz
Internal Clock Freq. Range
F
int_CK
.80
8.0
8.5
MHz
Match DRV0-3
D
Duty cycle deviation from Avg.
-1
+1
%
PWM Off Time
Toff
25
%
Drive Voltage Range
OutV
Output Freq. = 2MHz/Phase
V
O
= 2.000V
5
10
12
V
Overcurrent Comparator,
Comparator, Common Mode
Range
OCC_CMR
3
15
V
OC+I/P bias Current
IB_OC+
Vin = 5V,Roc+<20Kohm
+75
185
+250
μ
Α
OC-I/P bias Current
IB_OC-
Vin = 5V,Roc-<20Kohm
+75
125
+250
μ
Α
Input Offset Voltage
VOS_OCC
Vin = 5V
10
mV
Feedback Input Impedance
Ri_FB
V
O
= 2.00V
12
Κ
Maximum Duty Cycle
Dmax
FB=0V
75
%
Mimimum Duty Cycle
Dmin
FB=4.0V
0
%
CONVERTER SPECIFICATIONS, Reference Application Circuit
Output Accuracy Over Set
Range
V
OUT
VID 0-4 = 0000-1111
V
CC5V
= 5.0V
V
O
= 2.000V
I
O
= 3A - 20A
-1
+1
%
Load Regulation
.025
.05
%/A
Line Regulation
V
= 5V,
V
= 2.000V
V
= 4-6V, (vin separated from
Vcc5v) I
O
= 5A , Clk = external
.15
%/V
O
OUT
I
V
IN
OUT
V
V
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