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參數(shù)資料
| 型號： | LTC1735IS-1#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁數(shù)： | 27/28頁 |
| 文件大小： | 343K |
| 代理商： | LTC1735IS-1#TR |
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8
LTC1735-1
OPERATIO
U
(Refer to Functional Diagram)
FU CTIO AL DIAGRA
UU
W
SW
–
+
–
0.86V
–
+
0.55V
2.4V
0.8V
0.86V
I1
+
–
I2
+
–
EA
A
BURST
DISABLE
FC
OV
gm =1.3m
B
–
+
4.8V
IREV
+
–
+
–
F
FC
INTVCC
S
R
Q
DROP
OUT
DET
0.8V
REF
SWITCH
LOGIC
SD
6V
R1
RUN/SS
CSS
RC
VOSENSE
VFB
1.2
A
RUN
SOFT-
START
+
OVER-
CURRENT
LATCHOFF
SD
ITH
CC
0.17
A
OSC
4(VFB)
BUFFERED
ITH
SLOPE COMP
+
–
+
3mV
ICMP
R2
2k
45k
BOT
TOP ON
FORCE BOT
45k
100k
INTVCC
30k
SENSE+
SENSE–
SYNC
1.2V
+
–
0.74V
0.8V
C
TOP
UVL
BOT
INTVCC
5.2V
LDO
REG
VIN
+
CINTVCC
+
INTVCC
BG
PGND
VIN
BOOST
TG
INTVCC
CB
DB
D1
L
VOUT
RSENSE
COUT
COSC
+
CIN
EXTVCC
SGND
COSC
1735-1 FD
1
PGOOD 4
8
13
15
16
14
12
11
10
9
5
6
3
2
7
Main Control Loop:
The LTC1735-1 uses a constant frequency, current mode
step-down architecture. During normal operation, the top
MOSFET is turned on each cycle when the oscillator sets
the RS latch, and turned off when the main current
comparator I1 resets the RS latch. The peak inductor
current at which I1 resets the RS latch is controlled by the
voltage on Pin ITH, which is the output of error amplifier
EA. Pin VOSENSE, described in the Pin Functions, allows EA
to receive an output feedback voltage VFB from the external
resistive divider. When the load current increases, it
causes a slight decrease in VFB relative to the 0.8V refer-
ence, which in turn causes the ITH voltage to increase until
the average inductor current matches the new load cur-
rent. While the top MOSFET is off, the bottom MOSFET is
turned on until either the inductor current starts to reverse,
as indicated by current comparator I2, or the beginning of
the next cycle.
The top MOSFET driver is powered from a floating boot-
strap capacitor CB. This capacitor is normally recharged
from INTVCC through an external Schottky diode when the
top MOSFET is turned off. As VIN decreases towards VOUT,
the converter will attempt to turn on the top MOSFET con-
tinuously (“dropout’’). A dropout counter detects this con-
dition and forces the top MOSFET to turn off for about 500ns
every tenth cycle to recharge the bootstrap capacitor.
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