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LT8309_15

产品描述Secondary-Side Synchronous Rectifier Driver
文件大小225KB,共14页
制造商Linear ( ADI )
官网地址http://www.analog.com/cn/index.html
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LT8309_15概述

Secondary-Side Synchronous Rectifier Driver

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LT8309
Secondary-Side
Synchronous Rectifier Driver
FeaTures
n
n
n
n
n
DescripTion
The
LT
®
8309
is a secondary-side synchronous rectifier
driver that replaces the output rectifier diode in a flyback
topology. By replacing the diode with a N-channel MOSFET,
applications are no longer restricted by the heat constraints
of the output diode. The IC replicates the behavior of a
diode by sensing the drain-to-source voltage to determine
when the current becomes negative. The LT8309's low
minimum on- and off-times help improve noise immunity.
The fast propagation delay of 26ns allows applications to
operate in discontinuous conduction mode (DCM) and
critical conduction mode (CrCM). The gate driver features
a 0.8Ω pull-down device for fast turn-offs. The 40V V
CC
rating allows the part to be driven from the output volt-
age or the rectified drain voltage of the MOSFET. A low
quiescent current of 400µA maximizes efficiency at low
output currents.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
n
n
n
Works with DCM and BCM/CrCM Conduction Mode
Flyback Topologies
V
CC
: 4.5V to 40V
Supports Up to 150V MOSFETs
26ns Turn-Off Propagation Delay
Accurate Minimum On and Off Timers for Reliable
Operation
Adjustable and Accurate Trip Point: +5mV to –30mV
1Ω Gate Driver Pull-Down
SOT-23 5-Lead Package
applicaTions
n
n
High Output Current Flybacks
High Efficiency Flybacks
Typical applicaTion
40W, 5V Isolated Telecom Supply
V
IN
36V TO
72V
5.33:1
10µF
15.4k
412k
EN/UVLO
V
IN
R
FB
R
REF
60
100pF
147k
6.04k
TC
30.9k
0.1µF
SS
V
C
12.1k
15nF
GATE
SENSE
GND INTV
CC
4.7µF
V
OUT +
5V, 8A
100
95
90
EFFICIENCY (%)
85
80
75
70
V
OUT–
8309 TA01a
Efficiency vs Load Current
10
1µF
2.2k
V
CC
LT8309
400µF
V
IN
= 48V WITH LT8309
LT3748
6.2V
DRAIN
INTV
CC
GATE
GND
4.7µF
V
IN
= 48V WITH PDS760 DIODE
12m
65
0
1
2
3
4
5
6
LOAD CURRENT (A)
7
8
8309 TA01b
8309fa
For more information
www.linear.com/LT8309
1

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