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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)： | 4/11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
4
The SC1144 is patent pending
NOTE:
(1) All logic inputs and outputs are open collector TTL compatible.
PIN DESCRIPTION
Pin #
Pin Name
Pin Function
1
V
CC 5V
Supply voltage input (5V nominal)
2
Divsel
Connect to Gnd for four phase operation and to logic High for three Phase
operation.
3
Clksel
Clock Select: Logic high selects internal clock. Logic low selects external
clock.
4
Extclk
External Clock Input. The output frequency is determined by (Clock Input
Freq.)/4. Output freq.= (Clock Input)/4. Pull up to Vcc5v to select internal
clock.
5
R
REF
Connects to external reference resistor. Sets the operating frequency of
the internal clock and the ramp time for the PWM. Reference voltage at
this pin is 2.05V. Trimmed to set 250μA at 8MHz.
6
VID0
(1)
VID1
(1)
Programming Input (LSB)
7
Programming Input
8
VID2
(1)
Programming Input
9
VID3
(1)
VID4
(1)
Programming Input
10
Programming Input (MSB)
11
OC+
Over current comparator. Non-Inverting input.
12
OC-
Over current comparator. Inverting input.
13
COMP
Compensation Pin. Compensation is acheived by connecting a capacitor in
series with a resistor between this pin and FBG. A 300k ohm resistor must
also be directly connected between this pin and FBG.
14
FB
Feedback input connected to supply output.
15
B
GOUT
Bandgap Reference Output. Output resistance=3kohm. Must be bypassed
with 4.7nf -100nf capacitor to FBG. This capacitor programs the soft start
time.
16
FBG
Feedback Ground. This pin must be connected to return side of output
caps. This pin is floating, (within one diode drop of GND pin).
17
ENABLE
Connects to 5V to enable. Connect to GND to disable entire device.
18
GND
Ground Pin
19
DRV2
Phase 2 output
20
DRV0
Phase 0 output
21
V
CC12V
Supply voltage for the FET Drivers/DRV0-3
22
DRV1
Phase 1 output
23
DRV3
Phase 3 output
24
OutV
Sets the maximum DRV0-3 drive voltage in order to reduce switching
losses in the external MOSFETs.
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