参数资料
型号: LTC3829EUHF#PBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, PQCC38
封装: 5 X 7 MM, LEAD FREE, PLASTIC, M0-220WHKD, QFN-38
文件页数: 21/40页
文件大小: 478K
代理商: LTC3829EUHF#PBF
LTC3829
3829f
applicaTions inForMaTion
The LTC3829 allows the user to program how its output
ramps up and down by means of the TK/SS pins. Through
these pins, the output can be set up to either coincidentally
or ratiometrically track another supply’s output, as shown
in Figure 11. In the following discussions, VOUT1 refers
to the LTC3829’s output as a master and VOUT2 refers to
another supply output as a slave. To implement the coinci-
dent tracking in Figure 11a, connect an additional resistive
divider to VOUT1andconnectitsmid-pointtotheTK/SSpin
of the slave controller. The ratio of this divider should be
the same as that of the slave controller’s feedback divider
shown in Figure 12a. In this tracking mode, VOUT1 must
be set higher than VOUT2. To implement the ratiometric
tracking in Figure 11b, the ratio of the VOUT2dividershould
be exactly the same as the master controller’s feedback
divider shown in Figure 12b . By selecting different resis-
tors, the LTC3829 can achieve different modes of tracking
including the two in Figure 11.
So which mode should be programmed? While either
mode in Figure 11 satisfies most practical applications,
some trade-offs exist. The ratiometric mode saves a pair
of resistors, but the coincident mode offers better output
regulation. Under ratiometric tracking, when the master
controller’s output experiences dynamic excursion (under
load transient, for example), the slave controller output
will be affected as well. For better output regulation, use
the coincident tracking mode instead of ratiometric.
Figure 11. Two Different Modes of Output Voltage Tracking
Figure 12. Setup and Coincident and Ratiometric Tracking
TIME
(11a) Coincident Tracking
VOUT1
VOUT2
OUTPUT
VOLTAGE
3829 F11a
VOUT1
VOUT2
TIME
3829 F11b
(11b) Ratiometric Tracking
OUTPUT
VOLTAGE
R3
R1
R4
R2
R3
VOUT2
R4
(12a) Coincident Tracking Setup
TO
VFB1
PIN
TO
TK/SS2
PIN
TO
VFB2
PIN
VOUT1
R1
R2
R3
VOUT2
R4
3829 F12
(12b) Ratiometric Tracking Setup
TO
VFB1
PIN
TO
TK/SS2
PIN
TO
VFB2
PIN
VOUT1
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