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參數(shù)資料
| 型號(hào)： | LTC3860IUH#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32 |
| 文件頁數(shù)： | 14/36頁 |
| 文件大?。?/td> | 436K |
| 代理商： | LTC3860IUH#PBF |
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LTC3860
21
3860fc
Dual-Channel Operation
The LTC3860 can control two independent power supply
outputs with no channel-to-channel interaction or jitter.
The following recommendations will ensure maximum
performance in this mode of operation:
n The output of channel 1 should be sensed using the
remote sense differential amplier. The SGND pins and
exposed pad and all local small-signal GND should then
be a Kelvin connection to the negative terminal of the
channel 2 output. This will provide the best possible
regulation on channel 2 without adversely affecting
channel 1.
n Due to internal logic used to determine the mode of
operation, separate current limit resistors should be
used for each channel in dual-channel operation, even
when the values are the same.
Table 4 shows the ILIM and EA conguration for dual-
channel operation.
Table 4. Dual-Channel Conguration
CH1
CH2
EA1
EA2
ILIM1
ILIM2
Independent Independent
On
Resistor
to GND
Resistor
to GND
Tracking and Soft-Start (TRACK/SS Pins)
The start-up of the supply output is controlled by the volt-
age on the TRACK/SS pin for that channel. The LTC3860
regulates the FB pin voltage to the lower of the voltage
on the TRACK/SS pin and the internal 600mV reference.
APPLICATIONS INFORMATION
The TRACK/SS pin can therefore be used to program an
external soft-start function or allow the output supply to
track another supply during start-up.
External soft-start is enabled by connecting a capacitor
from the TRACK/SS pin to SGND. An internal 2.5μA current
source charges the capacitor, creating a linear voltage ramp
at the TRACK/SS pin, and causing the output supply to
rise smoothly from its prebiased value to its nal regulated
value. The total soft-start time is approximately:
t
SS = CSS
600mV
2.5A
Alternatively, the TRACK/SS pin can be used to track
another supply during start-up.
For example, Figure 11a shows the start-up of VOUT2 con-
trolled by the voltage on the TRACK/SS2 pin. Normally this
pin is used to allow the start-up of VOUT2 to track that of
VOUT1 as shown qualitatively in Figures 11a and 11b. When
the voltage on the TRACK/SS2 pin is less than the internal
0.6V reference, the LTC3860 regulates the FB2 voltage to
LTC3860
FB2
VOUT2
VOUT1
FB1
TRACK/SS2
R2B
R2A
3860 F11a
R1B
R1A
RTRACKA
RTRACKB
Figure 11b and 11c. Two Different Modes of Output Voltage Tracking
Figure 11a. Using the TRACK/SS Pin
TIME
(11b) Coincident Tracking
VOUT1
VOUT2
OUTPUT
VOL
TAGE
TIME
3860 F11b_c
(11c) Ratiometric Tracking
VOUT1
VOUT2
OUTPUT
VOL
TAGE
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