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参数资料
| 型号： | SC1578CS |
| 厂商： | Semtech Corporation |
| 英文描述： | CAP 47UF 50V ELECT TG SMD |
| 中文描述： | 高效降压型DC - DC转换器 |
| 文件页数： | 4/5页 |
| 文件大小： | 130K |
| 代理商： | SC1578CS |
1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH-EFFICIENCY STEP-DOWN
DC-DC CONVERTER
SC1578
January 29, 1998
PIN DESCRIPTIONS
PIN 1:
V
IN
4V to 24V input supply voltage.
PIN 5:
GND Power ground.
PIN 2:
DUTY Duty cycle adjustment pin. To be tied
to the V
IN pin directly or through a re-
sistor to adjust oscillator duty cycle.
See Electrical Characteristics: R
DUTY
must be above 1M
if V
IN>20V.
PIN 6:
DRI
Push-Pull driver output to drive an ex-
ternal P-channel MOSFET or PNP
transistor. When driving a PNP bipolar
transistor, a base resistor and a capac-
itor to the base of PNP are recom-
mended.
PIN 3:
SHDN Logical input to shutdown the chip:
V
SHDN = high for normal operation,
V
SHDN = low for shutdown.
This pin should not be left floating or
forced greater than 15V. In shutdown
mode the DRI pin is high.
PIN 7:
CS-
Current sense comparator inverting
input, not to exceed V
IN.
PIN 4:
FB
Feedback comparator input, to com-
pare the feedback voltage with the in-
ternal reference voltage. Connecting a
resistor R1 to the converter output and
a resistor R2 to ground yields the out-
put voltage:
V
OUT = 1.22 x (R1+R2)/R2
PIN 8:
CS+
Current sense comparator non-
inverting input, not to exceed V
IN.
Figure 3. Battery Charge Circuit with High-Side Current Sensing Constant Current Source
NOTE: R
SENSE=0.1 ohm, charge current=0.5A ± 10%, VIN>VBATT + 3.5V
R
SENSE=0.05 ohm, charge current=1A ± 10%, VIN>VBATT + 4V
R
SENSE=0.033 ohm, charge current=1.5A ± 10%, VIN>VBATT + 4.5V
Efficiency>90%, measured at CS- node
TYPICAL APPLICATION CIRCUIT
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