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参数资料
| 型号： | SC1158CS |
| 厂商： | Semtech Corporation |
| 英文描述： | PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS |
| 中文描述： | 可编程同步DC / DC控制器的先进的处理器 |
| 文件页数： | 4/5页 |
| 文件大小： | 71K |
| 代理商： | SC1158CS |
SC1158
PROGRAMMABLE SYNCHRONOUS DC/DC
CONTROLLER FOR ADVANCED PROCESSORS
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
Preliminary - August 7, 2000
4
THEORY OF OPERATION
The voltage at the VOSENSE pin is applied, through the internal precision resistor feedback chain, to the inverting
input of the error amplifier. The non-inverting input of the error amplifier is supplied with a DC voltage derived by
the DAC from the internal trimmed bandgap voltage reference. The output of the error amplifier is compared to the
triangular output of the internal oscillator to generate a fixed frequency, variable duty cycle pulse train. The internal
oscillator uses an on-chip capacitor and precision trimmed current sources to set the frequency to 140 kHz.
The generated pulse train is gated with the output of the current limit latch and the inhibit signal to produce a drive
signal for the upper FET. It is also inverted to produce a drive signal for the lower FET. These FET drive signals
are modified by the “shoot-through control” circuitry so that the top FET turn-on is delayed until the bottom FET has
turned off, and visa-versa.
The current limit latch is set (ending the upper FET drive pulse early) if the current limit comparator indicates an
overcurrent condition. The latch is reset at the start of each oscillator period.
OUTPUT VOLTAGE TABLE
Unless specified: V
CC = 4.75V to 5.25V; GND = PGND = 0V; FB = VO; 0mV < (CS(+) - CS(-)) < 60mV;
T
J = 0°C to 85°C
PARAMETER
CONDITIONS
VID
3210
MIN
TYP
MAX
UNITS
Output Voltage
(1)
I
O = 2A in Application Circuit
1111
1.980
2.000
2.020
V
(Figure 1)
1110
2.079
2.100
2.121
1101
2.178
2.200
2.222
1100
2.277
2.300
2.323
1011
2.376
2.400
2.424
1010
2.475
2.500
2.525
1001
2.574
2.600
2.626
1000
2.673
2.700
2.727
0111
2.772
2.800
2.828
0110
2.871
2.900
2.929
0101
2.970
3.000
3.030
0100
3.069
3.100
3.131
0011
3.168
3.200
3.232
0010
3.267
3.300
3.333
0001
3.366
3.400
3.434
0000
3.465
3.500
3.535
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