參數(shù)資料
型號(hào)： LTC3827IG-1#TR
廠(chǎng)商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3 A DUAL SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 5.30 MM, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 9/32頁(yè)
文件大小： 448K
代理商： LTC3827IG-1#TR
LTC3827-1
17
38271fe
APPLICATIONS INFORMATION
Tracking and Soft-Start (TRACK/SS Pins)
The start-up of each VOUT is controlled by the voltage on
the respective TRACK/SS pin. When the voltage on the
TRACK/SS pin is less than the internal 0.8V reference, the
LTC3827-1 regulates the VFB pin voltage to the voltage on
the TRACK/SS pin instead of 0.8V. The TRACK/SS pin can
be used to program an external soft-start function or to
allow VOUT to “track” another supply during start-up.
Soft-start is enabled by simply connecting a capacitor
from the TRACK/SS pin to ground, as shown in Figure 5.
An internal 1μA current source charges up the capacitor,
providing a linear ramping voltage at the TRACK/SS pin.
The LTC3827-1 will regulate the VFB pin (and hence VOUT)
according to the voltage on the TRACK/SS pin, allowing
VOUT to rise smoothly from 0V to its nal regulated value.
The total soft-start time will be approximately:
tSS = CSS
0.8V
1
μA
Alternatively, the TRACK/SS pin can be used to track two
(or more) supplies during start-up, as shown qualitatively
in Figures 6a and 6b. To do this, a resistor divider should
be connected from the master supply (VX) to the TRACK/
SS pin of the slave supply (VOUT), as shown in Figure 7.
During start-up VOUT will track VX according to the ratio
set by the resistor divider:
VX
VOUT
=
RA
RTRACKA
RTRACKA +RTRACKB
RA +RB
For coincident tracking (VOUT = VX during start-up),
RA = RTRACKA
RB = RTRACKB
INTVCC Regulators
The LTC3827-1 features two separate internal P-channel
low dropout linear regulators (LDO) that supply power
at the INTVCC pin from either the VIN supply pin or the
EXTVCC pin, respectively, depending on the connection
of the EXTVCC pin. INTVCC powers the gate drivers and
much of the LTC3827-1’s internal circuitry. The VIN LDO
regulates the voltage at the INTVCC pin to 5.25V and the
Figure 7. Using the TRACK/SS Pin for Tracking
Figure 6. Two Different Modes of Output
Voltage Tracking
TIME
(6a) Coincident Tracking
VX(MASTER)
VOUT(SLAVE)
OUTPUT
VOLTAGE
38271 F06A
VX(MASTER)
VOUT(SLAVE)
TIME
38271 F06B
(6b) Ratiometric Tracking
OUTPUT
VOLTAGE
1/2 LTC3827-1
VOUT
Vx
VFB
TRACK/SS
38271 F07
RB
RA
RTRACKA
RTRACKB
Figure 5. Using the TRACK/SS Pin to Program Soft-Start
1/2 LTC3827-1
TRACK/SS
CSS
SGND
38271 F05
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