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參數(shù)資料
| 型號(hào)： | LT3582EUD-5#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.72 A SWITCHING REGULATOR, PQCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁(yè)數(shù)： | 7/28頁(yè) |
| 文件大?。?/td> | 315K |
| 代理商： | LT3582EUD-5#TRPBF |
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LT3582/LT3582-5/LT3582-12
15
3582512fb
several start-up issues have occurred: A) the expected
VOUTP ramp up path is not followed B) inductor current
ringing occurs C) the VOUTP ramp rate is limited due to
the output disconnect current limit being reached D) ad-
ditional ringing occurs when the CAPP pin starts charging
E) output voltage overshoot occurs because the inductor
currents are maximized during the output ramp-up.
In some cases it may be desirable to use only one RAMP
pin capacitor. In cases where PUSEQ = 11 (see the
Power-
Up Sequencing section) the RAMPP and RAMPN pins
can be connected together and to a single capacitor. In
this case the capacitor will charge with twice the current
congured by the IRMP bits.
Ramping VOUTP from Ground: The LT3582 series has
the unique ability to generate a smooth VOUTP voltage
ramp starting from ground and continuing all the way up
to regulation (see Figure 6). This ability is not possible
with typical Boost converters in which the output is taken
from the cathode of the Schottky diode (CAPP node in
Figure 5).
L1
D1
SWP
C1
VOUTP
C3
VIN
C2
CAPP
LT3582
SERIES
DISCONNECT
CONTROL
LOAD
3582512 F05
APPLICATIONS INFORMATION
The LT3582 series incorporates an output disconnect
PMOS allowing VOUTP to be grounded during shutdown.
Once enabled, the Disconnect Control circuit actively
drives the PMOS gate allowing VOUTP to ramp up linearly
as shown in Figure 6. Once VOUTP reaches regulation,
the PMOS is fully turned “on” to reduce resistance and
improve efciency.
Power-Up Sequencing (PUSEQ bits)
Once enabled, the part requires a delay of TSTART-UP (64μs
typ) to properly congure itself. Once congured, the order
in which VOUTP and VOUTN ramp to regulation is controlled
by the PUSEQ bits. The combinations available for the
LT3582 are shown in Table 2. The LT3582-5/LT3582-12
are pre-congured with the 11 combination.
Table 2. Power-Up Sequences
PUSEQ[1:0] Power-Up Sequence
00
Outputs are disabled, neither output ramps up
01
VOUTN ramps up 1st, followed by VOUTP
10
VOUTP ramps up 1st, followed by VOUTN
11
Both VOUTP and VOUTN ramp-up starting at the same time.
Selecting the 01 or 10 combinations cause one of the out-
puts to start ramping shortly after SHDN rises. The ramp
rate of VOUT is controlled by the RAMP pin as discussed
in the Soft-Start section. After VOUT nears its target regula-
Figure 5. Boost Converter Topology
Figure 6. VOUTP Soft-Start Ramping from Ground
Figure 7. VOUTP Soft-Start with Excessive Ramp Rate
3582512 F06
CAPP
2V/DIV
IL2
0.2A/DIV
VRAMPP
0.2V/DIV
VOUTP
2V/DIV
1ms/DIV
3582512 F07
VOUTP
3V/DIV
VRAMPP
0.5V/DIV
CAPP
3V/DIV
IL2
0.2A/DIV
50μs/DIV
A
C
E
BD
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