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參數(shù)資料
| 型號： | LTC3534EGN#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1150 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 218K |
| 代理商： | LTC3534EGN#TR |
LTC3534
11
3534f
In Burst Mode operation the typical maximum average
output currents in the three operating regions, buck, four
switch, and boost are given by:
IOUT(MAX)BURST–BUCK ≈ 100mA;
Burst Mode operation – buck region: VIN > VOUT
IOUT(MAX)BURST–FOUR_SWITCH ≈ 200mA;
Burst Mode operation – four switch region: VIN ≈ VOUT
IOUT(MAX)BURSTBOOST ≈
200 VIN
VOUT
mA;
Burst Mode operation – boost region: VIN < VOUT
The efciency below 1mA becomes dominated primarily
by the quiescent current. The Burst Mode operation ef-
ciency is given by:
Efficiency
ηILOAD
25A
+ILOAD
where
η is typically 90% during Burst Mode operation.
A graph of Burst Mode operation maximum output current
vs VIN (for VOUT = 5V) is provided in the Typical Perfor-
mance Characteristics section.
Burst Mode Operation to Fixed Frequency Transient
Response
In Burst Mode operation, the compensation network is
not used and VC is disconnected from the error amplier.
During long periods of Burst Mode operation, leakage
currents in the external components or on the PC board
could cause the compensation capacitor to charge (or
discharge), which could result in a large output transient
when returning to xed frequency mode operation, even
at the same load current. To prevent this, the LTC3534
incorporates an active clamp circuit that holds the voltage
on VC at an optimal voltage during Burst Mode operation.
This minimizes any output transient when returning to
xed frequency mode operation. For optimum transient
response, Type III compensation is also recommended
to broad band the control loop and roll off past the two
pole response of the output LC lter. (See Closing the
Feedback Loop).
Soft-Start
The soft-start function is combined with shutdown. When
the RUN/SS pin is brought above 1V typical, the LTC3534
is enabled but the error amplier duty cycle is clamped
from VC. A detailed diagram of this function is shown in
Figure 3. The components RSS and CSS provide a slow
ramping voltage on RUN/SS to provide a soft-start function.
To ensure that VC is not being clamped, RUN/SS must be
raised to 2.4V or above.
OPERATION
–
+
15
14
13
2
11
VIN
CSS
RSS
RUN/SS
1V
FB
R1
R2
CP1
VC
VCI
VOUT
1V
TO PWM
COMPARATORS
CHIP
ENABLE
SIGNAL
3534 F03
–
+
ERROR
AMP
Figure 3. Soft-Start Circuitry
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