参数资料
型号: LTC1735CGN-1#TRPBF
厂商: Linear Technology
文件页数: 8/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 16-SSOP
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 335kHz
占空比: 99.4%
电源电压: 3.5 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 85°C
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)
LTC1735-1
FU CTIO AL DIAGRA
V IN
INTV CC
13 V IN
+
C IN
100k
C OSC
INTV CC
0.8V
REF
UVL
PGOOD 4
C OSC 1
SGND 8
0.17 μ A
INTV CC
OSC
SYNC
C
+
1.2V
FORCE BOT
0.8V
+
F
FC
TOP
BOOST
15
TG
16
D B
C B
DROP
OUT
SW
DET
BOT
SWITCH
14
+
0.74V
0.86V
+
OV
S
R
Q
TOP ON
0.55V
+
B
LOGIC
D 1
L
R SENSE
+
V OUT
C OUT
R1
V OSENSE
7
R2
V FB
0.8V
1.2 μ A
+
EA
g m =1.3m
SD
RUN
SOFT-
START
0.86V
4(V FB )
2.4V
2k
ICMP
I 1 – +
+
BURST
DISABLE
FC
A
BUFFERED
45k
+
3mV
45k
I 2
+
SD
IREV
INTV CC
BOT
V IN
5.2V
LDO
REG
INTV CC
12
C INTVCC
+
6V
RUN/SS
2
+
OVER-
CURRENT
LATCHOFF
R C
SLOPE COMP
3 I TH
I TH
SENSE + 6
30k
30k
5 SENSE –
4.8V
+
EXTV CC 9
BG
11
PGND
10
C SS
C C
1735-1 FD
OPERATIO
Main Control Loop :
(Refer to Functional Diagram)
the average inductor current matches the new load cur-
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 I 1 resets the RS latch. The peak inductor
current at which I 1 resets the RS latch is controlled by the
voltage on Pin I TH , which is the output of error amplifier
EA. Pin V OSENSE , described in the Pin Functions, allows EA
to receive an output feedback voltage V FB from the external
resistive divider. When the load current increases, it
causes a slight decrease in V FB relative to the 0.8V refer-
ence, which in turn causes the I TH voltage to increase until
8
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 I 2 , or the beginning of
the next cycle.
The top MOSFET driver is powered from a floating boot-
strap capacitor C B . This capacitor is normally recharged
from INTV CC through an external Schottky diode when the
top MOSFET is turned off. As V IN decreases towards V OUT ,
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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