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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)： | 5/36頁 |
| 文件大小： | 380K |
| 代理商： | LTC3867IUF#PBF |
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LTC3867
13
3867f
load across the load capacitors directly greatly benefits
regulation in high current, low voltage applications, where
boardinterconnectionlossescanbeasignificantportionof
the total error budget. Connect DIFF+ to the center tap of
the feedback divider across the output load, and DIFF– to
the load ground. See Figure 1
TheLTC3867differentialamplifierhasatypicaloutputslew
rate of 2V/s. The amplifier is configured for unity gain,
meaning that the difference between DIFF+ and DIFF– is
translated to DIFFOUT, relative to SGND.
Care should be taken to route the DIFF+ and DIFF– PCB
traces parallel to each other all the way to the remote sens-
ing points on the board. In addition, avoid routing these
sensitive traces near any high speed switching nodes in
the circuit. Ideally, the DIFF+ and DIFF– traces should be
shielded by a low impedance ground plane to maintain
signal integrity.
Power Good (PGOOD Pin)
The PGOOD pin is connected to the open drain of an
internal N-channel MOSFET. The MOSFET turns on and
pulls the PGOOD pin low when the VFB pin voltage is not
within ±7.5% of the 0.6V reference voltage. The PGOOD
pin is also pulled low when the RUN pin is below 1.22V or
when the LTC3867 is in the soft-start or tracking up phase.
When the VFB pin voltage is within the ±7.5% regulation
window, the MOSFET is turned off and the pin is allowed
to be pulled up by an external resistor to a source of up to
6V. The PGOOD pin will flag power good immediately when
the VFBpiniswithintheregulationwindow.However,there
is an internal 45s power-bad mask when the VFB goes
out of the window. There is a second set of thresholds set
at 17% and –25% that bypass this delay.
Output Overvoltage Protection
An overvoltage comparator, OV, guards against transient
overshoots (>7.5%) as well as other more serious con-
ditions that may overvoltage the output. In such cases,
the top MOSFET is turned off and the bottom MOSFET is
turned on until the overvoltage condition is cleared.
Undervoltage Lockout
The LTC3867 has two functions that help protect the
controller in case of undervoltage conditions. A precision
UVLO comparator constantly monitors the INTVCCvoltage
to ensure that an adequate gate-drive voltage is present. It
locks out the switching action when INTVCC is below 3.2V.
To prevent oscillation when there is a disturbance on the
INTVCC, the UVLO comparator has 600mV of precision
hysteresis.
Another way to detect an undervoltage condition is to
monitor the VIN supply. Because the RUN pin has a pre-
cision turn-on reference of 1.22V, one can use a resistor
divider to VIN to turn on the IC when VIN is high enough.
An extra 4A of current flows out of the RUN pin once
the RUN pin voltage passes 1.22V. The RUN comparator
itself has about 80mV of hysteresis. One can program
additional hysteresis for the RUN comparator by adjust-
ing the values of the resistive divider. For accurate VIN
undervoltage detection, VIN needs to be higher than 4.5V.
OPERATION
4
2
DIFFOUT
LTC3867
FEEDBACK
DIVIDER
DIFF+
CF1
RD1
COUT1
COUT2
VOUT
10
RD2
DIFF–
VFB
3867 F01
0
10
3
–
+
DIFFAMP
Figure 1. Differential Amplifier Connection
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