參數(shù)資料
型號: LTC3616IUDD#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 13.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC24
封裝: 3 X 5 MM, LEAD FREE, PLASTIC, QFN-24
文件頁數(shù): 13/28頁
文件大小: 490K
代理商: LTC3616IUDD#TRPBF
LTC3616
20
3616fa
applicaTions inForMaTion
Output Voltage Tracking Input
If the DDR pin is not tied to SVIN, once VTRACK/SS exceeds
0.6V,therunstateisenteredandtheMODEselection,power
good and current foldback circuits are enabled.
In the run state, the TRACK/SS pin can be used for track-
ing down/up the output voltage of another supply. If the
VTRACK/SS drops below 0.6V, the LTC3616 enters the down
trackingstateandVOUTisreferencedtotheTRACK/SSvolt-
age. If the TRACK/SS pin drops below 0.2V, the switching
frequency is reduced to ensure that the minimum duty
cycle limit does not prevent the output from following
the TRACK/SS pin. The run state will resume if VTRACK/SS
again exceeds 0.6V and VOUT is referenced to the internal
precision reference (see Figure 8).
Through the TRACK/SS pin, the output voltage can be set
up for either coincident or ratiometric tracking, as shown
in Figure 6.
To implement the coincident tracking behavior in Fig-
ure 6a, connect an extra resistive divider to the output
of the master channel and connect its midpoint to the
TRACK/SS pin for the slave channel. The ratio of this
divider should be selected to be the same as that of the
slavechannel’sfeedbackdivider(Figure 7a).Inthistrack-
ing mode, the master channel’s output must be set higher
than slave channel’s output. To implement the ratiometric
tracking behavior in Figure 6b, different resistor divider
values must be used as specified in Figure 7b.
For coincident start-up, the voltage value at the TRACK/SS
pin for the slave channel needs to reach the final reference
value after the internal soft-start time (around 1ms). The
master start-up time needs to be adjusted with an external
capacitor and resistor to ensure this.
External Reference Input (DDR Mode)
If the DDR pin is tied to SVIN (DDR mode), the run state
is entered when VTRACK/SS exceeds 0.3V and tracking
down behavior is possible if the VTRACK/SS voltage is
below 0.6V.
This allows TRACK/SS to be used as an external reference
between 0.3V and 0.6V if desired. During the run state in
DDR mode, the power good window moves in relation
Figure 7a. Setup for Coincident Tracking
Figure 7b. Setup for Ratiometric Tracking
VFB2
R4
R2
R4
R2
R3
R2
R4 ≤ R3
VOUT2
VOUT1
LTC3616
TRACK/SS2
VFB1
VIN
LTC3616
LTC3616 CHANNEL 2
SLAVE
LTC3616 CHANNEL 1
MASTER
TRACK/SS1
3616 F07a
VFB2
R1
R2
R5
R6
R3 R1/R2 < R5/R6
R4
VOUT2
VOUT1
LTC3616
TRACK/SS2
VFB1
VIN
3616 F07b
LTC3616
LTC3616 CHANNEL 2
SLAVE
LTC3616 CHANNEL 1
MASTER
TRACK/SS1
Figure 6. Two Different Modes of Output Voltage Tracking
TIME
(6b) Ratiometric Tracking
VOUT1
VOUT2
OUTPUT
VOL
TAGE
TIME
3616 F06
(6a) Coincident Tracking
VOUT1
VOUT2
OUTPUT
VOL
TAGE
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