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參數(shù)資料
| 型號： | LTC3862IUH#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24 |
| 封裝： | 5 X 5 MM, 0.65 MM PITCH, LEAD FREE, PLASTIC, QFN-24 |
| 文件頁數(shù)： | 17/40頁 |
| 文件大?。?/td> | 613K |
| 代理商： | LTC3862IUH#PBF |
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LTC3862
24
3862fb
SENSE1+
3V8
SLOPE
BLANK
CLKOUT
SYNC
PLLFLTR
PHASEMODE
DMAX
10nF
SENSE1–
SENSE2–
SENSE2+
RUN
FREQ
SS
VIN
66.5k
24.9k
84.5k
10Ω
VIN
5V TO 36V
D1
PDS760
D2
PDS760
10Ω
L2
19.4μH
PA2020-193
ITH
SGND
VOUT
12.4k
FB
68.1k
475k
10nF
1μF
1nF
6.8μF 50V
0.006Ω
1W
Q1
HAT2266H
Q2
HAT2266H
0.006Ω
1W
VOUT
48V
2A TO 5A
3862 F18
100μF
63V
100μF
63V
6.8μF 50V
LTC3862
10nF
100pF
INTVCC
GATE1
GATE2
PGND
4.7μF
10nF
6.8μF 50V
L1
19.4μH
PA2020-193
+
Figure 18. A Typical 2-Phase, Single Output Boost Converter Application Circuit
Typical Boost Applications Circuit
A basic 2-phase, single output LTC3862 application circuit is
shown in Figure 18. External component selection is driven
by the characteristics of the load and the input supply.
Duty Cycle Considerations
For a boost converter operating in a continuous conduction
mode (CCM), the duty cycle of the main switch is:
D
VV
V
VV
tf
OF
IN
OF
ON
=
+
=
–
where VF is the forward voltage of the boost diode. The
minimum on-time for a given application operating in
CCM is:
t
f
VV
V
VV
ON MIN
OF
IN MAX
OF
()
–
=
+
1
For a given input voltage range and output voltage, it is
important to know how close the minimum on-time of the
application comes to the minimum on-time of the control
IC. The LTC3862 minimum on-time can be programmed
from 180ns to 340ns using the BLANK pin.
Minimum On-Time Limitations
In a single-ended boost converter, two steady-state condi-
tions can result in operation at the minimum on-time of
the controller. The rst condition is when the input voltage
is close to the output voltage. When VIN approaches VOUT
the voltage across the inductor approaches zero during
the switch off-time. Under this operating condition the
converter can become unstable and the output can experi-
ence high ripple voltage oscillation at audible frequencies.
For applications where the input voltage can approach
or exceed the output voltage, consider using a SEPIC or
buck-boost topology instead of a boost converter.
The second condition that can result in operation at the
minimum on-time of the controller is at light load, in deep
discontinuous mode. As the load current is decreased,
the on-time of the switch decreases, until the minimum
on-time limit of the controller is reached. Any further de-
crease in the output current will result in pulse skipping,
a typically benign condition where cycles are skipped in
order to maintain output regulation.
APPLICATIONS INFORMATION
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| LTC3862EGN#PBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| LTC3862EUH#TRPBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24 |
| LTC3862HGN#TRPBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| LTC3862IUH#TRPBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24 |
| LTC3862HGN#PBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
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