參數(shù)資料
型號(hào)： LTC3890MPUH#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32
文件頁(yè)數(shù)： 13/38頁(yè)
文件大?。?/td> 381K
代理商： LTC3890MPUH#TRPBF
LTC3890
20
3890fa
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 LTC3890 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 6.
An internal 1μA current source charges the capacitor,
providing a linear ramping voltage at the TRACK/SS pin.
The LTC3890 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 final regulated value.
The total soft-start time will be approximately:
tSS = CSS
0.8V
1μA
TIME
VX(MASTER)
VOUT(SLAVE)
OUTPUT
VOLTAGE
3890 F07a
TIME
3890 F07b
VX(MASTER)
VOUT(SLAVE)
OUTPUT
VOLTAGE
1/2 LTC3890
VOUT
Vx
VFB
TRACK/SS
3890 F08
RB
RA
RTRACKA
RTRACKB
(7a) Coincident Tracking
(7b) Ratiometric Tracking
Figure 8. Using the TRACK/SS Pin for Tracking
1/2 LTC3890
TRACK/SS
CSS
SGND
3890 F06
Figure 6. Using the TRACK/SS Pin to Program Soft-Start
Alternatively, the TRACK/SS pin can be used to track two
(or more) supplies during start-up, as shown qualitatively
in Figures 7a and 7b. 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 8.
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
Figure 7. Two Different Modes of Output Voltage Tracking
相關(guān)PDF資料
PDF描述
LTC3890EUH#PBF DUAL SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PQCC32
LTC3890IUH#TRPBF DUAL SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PQCC32
LTC3890HUH#PBF DUAL SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PQCC32
LTC3890HUH#TRPBF DUAL SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PQCC32
LTC3891HFE#TRPBF SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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