參數(shù)資料
型號(hào)： LTC3633EUFD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PQCC28
封裝： 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28
文件頁(yè)數(shù)： 9/28頁(yè)
文件大?。?/td> 384K
代理商： LTC3633EUFD#TRPBF
LTC3633
17
3633f
MODE/SYNC Operation
The MODE/SYNC pin is a multipurpose pin allowing both
mode selection and operating frequency synchronization.
Floating this pin or connecting it to INTVCC enables Burst
Mode operation for superior efciency at low load currents
at the expense of slightly higher output voltage ripple. When
the MODE/SYNC pin is tied to ground, forced continuous
mode operation is selected, creating the lowest xed output
ripple at the expense of light load efciency.
The LTC3633 will detect the presence of the external clock
signal on the MODE/SYNC pin and synchronize the internal
oscillator to the phase and frequency of the incoming
clock. The presence of an external clock will place both
regulators into forced continuous mode operation.
Output Voltage Tracking and Soft-Start
The LTC3633 allows the user to control the output voltage
ramp rate by means of the TRACKSS pin. From 0 to 0.6V, the
TRACKSS voltage will override the internal 0.6V reference
input to the error amplier, thus regulating the feedback
voltage to that of the TRACKSS pin. When TRACKSS is
above 0.6V, tracking is disabled and the feedback voltage
will regulate to the internal reference voltage.
APPLICATIONS INFORMATION
The voltage at the TRACKSS pin may be driven from an
external source, or alternatively, the user may leverage
the internal 1.4μA pull-up current source to implement
a soft-start function by connecting an external capacitor
(CSS) from the TRACKSS pin to ground. The relationship
between output rise time and TRACKSS capacitance is
given by:
tSS = 430000Ω CSS
A default internal soft-start ramp forces a minimum soft-
start time of 400μs by overriding the TRACKSS pin input
during this time period. Hence, capacitance values less
than approximately 1000pF will not signicantly affect
soft-start behavior.
When driving the TRACKSS pin from another source, each
channel’s output can be set up to either coincidentally or
ratiometrically track another supply’s output, as shown in
Figure 4. In the following discussions, VOUT1 refers to the
LTC3633 output 1 as a master channel and VOUT2 refers
to output 2 as a slave channel. In practice, either channel
can be used as the master.
To implement the coincident tracking in Figure 4a, con-
nect an additional resistive divider to VOUT1 and connect
its midpoint to the TRACKSS pin of the slave channel.
TIME
(4a) Coincident Tracking
VOUT1
VOUT2
OUTPUT
VOLTAGE
3633 F04a
VOUT1
VOUT2
TIME
3633 F04b
(4b) Ratiometric Tracking
OUTPUT
VOLTAGE
Figure 4. Two Different Modes of Output Voltage Tracking
相關(guān)PDF資料
PDF描述
LTC3634EUFD#PBF 5.5 A DUAL SWITCHING CONTROLLER, 4600 kHz SWITCHING FREQ-MAX, PQCC28
LTC3634EFE#TRPBF 5.5 A DUAL SWITCHING CONTROLLER, 4600 kHz SWITCHING FREQ-MAX, PDSO28
LTC3634EFE#PBF 5.5 A DUAL SWITCHING CONTROLLER, 4600 kHz SWITCHING FREQ-MAX, PDSO28
LTC3642IMS8E-3.3E#PBF 0.13 A SWITCHING REGULATOR, PDSO8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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