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參數(shù)資料
| 型號： | LTC3867IUF#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24 |
| 文件頁數(shù)： | 18/36頁 |
| 文件大?。?/td> | 380K |
| 代理商： | LTC3867IUF#PBF |
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LTC3867
25
3867f
APPLICATIONS INFORMATION
the soft-start phase expires, the LTC3867 is forced into
continuous mode of operation as soon as VFB is below
the undervoltage threshold of 0.555V regardless of the
setting on the MODE pin. However, the LTC3867 should
always be set in forced continuous mode tracking down
when there is no load. After TK/SS drops below 0.1V, the
controller operates in discontinuous mode.
The LTC3867 allows the user to program how its output
ramps up and down by means of the TK/SS pin. Through
these pins, the output can be set up to either coincidentally
or ratiometrically track another supply’s output, as shown
in Figure 10. In the following discussions, VOUT2 refers to
theLTC3867’soutputasaslaveandVOUT1referstoanother
supply output as a master. To implement the coincident
tracking in Figure 10a, connect an additional resistive di-
vider to VOUT1 and connect its mid-point to the TK/SS pin
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 11a. In this tracking mode, VOUT1 must
be set higher than VOUT2. To implement the ratiometric
tracking in Figure 10b, the ratio of the VOUT2dividershould
be exactly the same as the master controller’s feedback
divider shown in Figure 11b . By selecting different resis-
tors, the LTC3867 can achieve different modes of tracking
including the two in Figure 10.
So which mode should be programmed? While either
mode in Figure 10 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 10. Two Different Modes of Output Voltage Tracking
Figure 11. Setup and Coincident and Ratiometric Tracking
TIME
(10a) Coincident Tracking
VOUT1
VOUT2
OUTPUT
VOLTAGE
VOUT1
VOUT2
TIME
3867 F10
(10b) Ratiometric Tracking
OUTPUT
VOLTAGE
R3
R1
R4
R2
R3
VOUT2
R4
(11a) Coincident Tracking Setup
TO
VFB1
PIN
TO
TK/SS2
PIN
TO
VFB2
PIN
VOUT1
R1
R2
R3
VOUT2
R4
3867 F11
(11b) Ratiometric Tracking Setup
TO
VFB1
PIN
TO
TK/SS2
PIN
TO
VFB2
PIN
VOUT1
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