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參數(shù)資料
| 型號(hào)： | LTC3873ITS8-5#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大小： | 170K |
| 代理商： | LTC3873ITS8-5#TR |
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LTC3873-5
8
38735fb
OPERATION
VTURNON (nominally 4.1V) at least momentarily to enable
LTC3873-5 operation. The VCCvoltageisthenallowedtofall
to VTURNOFF (nominally 2.9V) before undervoltage lockout
disables the LTC3873-5. The RUN/SS pin can be driven
below VSHDN (nominally 0.7V) to force the LTC3873-5 into
shutdown. When the chip is off, the input supply current is
typically only 50μA. Keep in mind that VCC should exceed
the gate threshold voltage of the switching MOSFET for
safe operation.
Soft-Start
Leave the RUN/SS pin open to use the internal 3.3ms
soft-start. During the internal soft-start, a voltage ramp
limits the VITH. 3.3ms is required for ITH to ramp from
zero current level to full current level. The soft-start can
be lengthened by placing an external capacitor from the
RUN/SS pin to the GND. A 3μA current will charge the
capacitor, pulling the RUN/SS pin above the shutdown
threshold and a 15μA pull-up current will continue to ramp
RUN/SS to limit VITH during the start-up. When RUN/SS
is driven by an external logic, a minimum of 2.75V logic
is recommended to allow the maximum ITH range.
Light Load Operation
Under very light load current conditions, the ITH pin voltage
will be very close to 0.85V. As the load current decreases
further, an internal offset at the current comparator input
will assure that the current comparator remains tripped
(even at zero load current) and the regulator will start to
skip cycles in order to maintain regulation. This behavior
allows the regulator to maintain constant frequency down
to very light loads, resulting in low output ripple as well
as low audible noise and reduced RF interference while
providing high light load efciency.
Current Sense
During the switch on-time, the control circuit limits the
maximum voltage drop across the current sense com-
ponent to about 295mV, 110mV and 185mV at low duty
cycle with IPRG tied to VIN, GND or left oating respec-
tively. It is reduced with increasing duty cycle as shown
in Figure 4.
Figure 4. Maximum SENSE Threshold Voltage vs Duty Cycle
DUTY CYCLE (%)
1
0
MAXIMUM
CURRENT
SENSE
VOL
TAGE
(mV)
50
100
150
200
250
300
20
40
60
80
3873-5 F04
100
IPRG = HIGH
IPRG = FLOAT
IPRG = LOW
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