參數(shù)資料
型號(hào)： LT3757MPMSE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 3/36頁(yè)
文件大?。?/td> 436K
代理商： LT3757MPMSE#TRPBF
LT3757
11
3757fc
applicaTions inForMaTion
Figure 2. Recommended Maximum QG vs VIN at Different
Frequencies to Ensure INTVCC Higher Than 4.5V
An effective approach to reduce the power consumption
of the internal LDO for gate drive is to tie the INTVCC pin
to an external voltage source high enough to turn off the
internal LDO regulator.
If the input voltage VIN does not exceed the absolute
maximum rating of both the power MOSFET gate-source
voltage(VGS)andtheINTVCCovervoltagelockoutthreshold
voltage (17.5V), the INTVCC pin can be shorted directly
to the VIN pin. In this condition, the internal LDO will be
turned off and the gate driver will be powered directly
from the input voltage, VIN. With the INTVCC pin shorted to
VIN, however, a small current (around 16A) will load the
INTVCC in shutdown mode. For applications that require
the lowest shutdown mode input supply current, do not
connect the INTVCC pin to VIN.
In SEPIC or flyback applications, the INTVCC pin can be
connected to the output voltage VOUT through a blocking
diode, as shown in Figure 3, if VOUT meets the following
conditions:
1. VOUT < VIN (pin voltage)
2. 7.2 < VOUT < 17.5V
3. VOUT < maximum VGS rating of power MOSFET
A resistor RVCC can be connected, as shown in Figure 3, to
limit the inrush current from VOUT. Regardless of whether
Figure 3. Connecting INTVCC to VOUT
CVCC
4.7F
VOUT
3757 F03
INTVCC
GND
LT3757
RVCC
DVCC
VIN (V)
0
Q
G(nC)
200
250
150
100
10
20
5
15
30
40
25
35
50
0
300
3757 F02
300kHz
1MHz
or not the INTVCC pin is connected to an external voltage
source, it is always necessary to have the driver circuitry
bypassed with a 4.7F low ESR ceramic capacitor to
ground immediately adjacent to the INTVCC and GND pins.
Operating Frequency and Synchronization
The choice of operating frequency may be determined
by on-chip power dissipation, otherwise it is a trade-off
between efficiency and component size. Low frequency
operation improves efficiency by reducing gate drive cur-
rent and MOSFET and diode switching losses. However,
lower frequency operation requires a physically larger
inductor. Switching frequency also has implications for
loopcompensation.TheLT3757usesaconstant-frequency
architecture that can be programmed over a 100kHz to
1000kHz range with a single external resistor from the
RT pin to ground, as shown in Figure 1. The RT pin must
have an external resistor to GND for proper operation of
the LT3757. A table for selecting the value of RT for a given
operating frequency is shown in Table 1.
Table 1. Timing Resistor (RT) Value
OSCILLATOR FREQUENCY (kHz)
RT (kΩ)
100
140
200
63.4
300
41.2
400
30.9
500
24.3
600
19.6
700
16.5
800
14
900
12.1
1000
10.5
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