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参数资料
| 型号： | SC1146CSW |
| 厂商： | Semtech Corporation |
| 英文描述： | VRM9.0 PROGRAMMABLE, MULTI-PHASE, HIGH PERFORMANCE PWM CONTROLLER |
| 中文描述： | VRM9.0可编程多相位，高性能的PWM控制器 |
| 文件页数： | 5/10页 |
| 文件大小： | 148K |
| 代理商： | SC1146CSW |
VRM9.0 PROGRAMMABLE, MULTI-PHASE,
HIGH PERFORMANCE PWM CONTROLLER
SC1146
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
July 25, 2000
4
The SC1146 is patent pending
NOTE: (1) All logic inputs and outputs are open collector TTL compatible.
PIN DESCRIPTION
Pin #
Pin Name
Pin Function
1V
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.
5R
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 250A at 8MHz.
6VID0
(1)
Programming Input (LSB)
7VID1
(1)
Programming Input
8VID2
(1)
Programming Input
9VID3
(1)
Programming Input
10
VID4
(1)
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
BG
OUT
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 not internally connected to GND.
17
ENABLE
Connects to 5V to ENABLE. Connect to GND to disable entire device.
18
GND
Ground Pin
19
DRV2
Phase 2 output, output voltage range ~.3V - V
CC2 - 1V.
20
DRV0
Phase 0 output, output voltage range ~.3V - V
CC2 - 1V.
21
VCC2
Supply voltage for the DRV0-3, may be connected to +5V or +12V supply.
There is no Undervoltage Lockout on this pin.
22
DRV1
Phase 1 output, output voltage range ~.3V - V
CC2 - 1V.
23
DRV3
Phase 3 output, output voltage range ~.3V - V
CC2 - 1V.
24
PWRGOOD
Power good should be pulled-up to 5V supply via a 3K - 10K resistor.
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