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参数资料
| 型号： | LTC3727AIG-1#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | 5.30 MM, LEAD FREE, PLASTIC, SSOP-28 |
| 文件页数： | 10/32页 |
| 文件大小： | 328K |
| 代理商： | LTC3727AIG-1#TRPBF |
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LTC3727A-1
18
3727a1fa
2. EXTVCC Connected directly to VOUT. This is the normal
connection for a 7.5V regulator and provides the highest
efciency.
3. EXTVCC Connected to an External supply. If an external
supply is available in the 7.5V to 8.5V range, it may be
used to power EXTVCC providing it is compatible with the
MOSFET gate drive requirements.
4. EXTVCCConnectedtoanOutput-DerivedBoostNetwork.
For 3.3V and other low voltage regulators, efciency
gains can still be realized by connecting EXTVCC to an
output-derived voltage that has been boosted to greater
than 7.5V. This can be done with the inductive boost
winding as shown in Figure 6.
Topside MOSFET Driver Supply (CB, DB)
External bootstrap capacitors CB connected to the BOOST
pins supply the gate drive voltages for the topside MOSFETs.
Capacitor CB in the functional diagram is charged though
external diode DB from INTVCC when the SW pin is low.
When one of the topside MOSFETs is to be turned on,
the driver places the CB voltage across the gate-source
of the desired MOSFET. This enhances the MOSFET and
turns on the topside switch. The switch node voltage, SW,
rises to VIN and the BOOST pin follows. With the topside
MOSFET on, the boost voltage is above the input supply:
VBOOST = VIN + VINTVCC. The value of the boost capacitor
CB needs to be 100 times that of the total input capacitance
APPLICATIONS INFORMATION
Figure 6. Secondary Output Loop & EXTVCC Connection
EXTVCC
FCB
SGND
VIN
TG1
SW
BG1
PGND
LTC3727A-1
RSENSE
VOUT
VSEC
+
COUT
+
1μF
3727 F06
N-CH
R6
+
CIN
VIN
T1
1:N
OPTIONAL EXTVCC
CONNECTION
7.5V < VSEC < 8.5V
R5
of the topside MOSFET(s). The reverse breakdown of the
external Schottky diode must be greater than VIN(MAX).
When adjusting the gate drive level, the nal arbiter is the
total input current for the regulator. If a change is made
and the input current decreases, then the efciency has
improved. If there is no change in input current, then there
is no change in efciency.
Output Voltage
The LTC3727A-1 output voltages are each set by an external
feedback resistive divider carefully placed across the output
capacitor. The resultant feedback signal is compared with
the internal precision 0.800V voltage reference by the error
amplier. The output voltage is given by the equation:
VV
R
OUT =+
08
1
2
1
.
where R1 and R2 are dened in Figure 2.
SENSE+/SENSE– Pins
The common mode input range of the current comparator
sense pins is from 0V to 14V. Continuous linear operation is
guaranteed throughout this range allowing output voltage
setting from 0.8V to 14V. A differential NPN input stage is
biased with internal resistors from an internal 2.4V source
as shown in the Functional Diagram. This requires that
current either be sourced or sunk from the SENSE pins
depending on the output voltage. If the output voltage is
below 2.4V current will ow out of both SENSE pins to
the main output. The output can be easily preloaded by
the VOUT resistive divider to compensate for the current
comparator’s negative input bias current. The maximum
current owing out of each pair of SENSE pins is:
ISENSE+ + ISENSE– = (2.4V – VOUT)/24k
Since VOSENSE is servoed to the 0.8V reference voltage,
we can choose R1 in Figure 2 to have a maximum value
to absorb this current.
Rk
V
VV
MAX
OUT
124
08
24
()
.
.–
.
=
<
for
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