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LTC3900_1

更新时间： 2022-11-16 12:14:44
品牌 Logo 应用领域
凌特 - Linear 驱动器
页数 文件大小 规格书
20页 268K
描述
Synchronous Rectifier Driver for Forward Converters

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中文翻译

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LTC3900_1 数据手册

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LTC3900  
Synchronous Rectifier Driver  
for Forward Converters  
FeaTures  
DescripTion  
The LTC®3900 is a secondary-side synchronous recti-  
fier driver designed to be used in isolated forward con-  
verter power supplies. The chip drives N-channel rectifier  
MOSFETs and accepts pulse sychronization from the  
primary-side controller via a pulse transformer.  
n
N-Channel Synchronous Rectifier MOSFET Driver  
n
Programmable Timeout Protection  
n
Reverse Inductor Current Protection  
n
Pulse Transformer Synchronization  
n
Wide V Supply Range: 4.5V to 11V  
CC  
n
n
n
15ns Rise/Fall Times at V = 5V, C = 4700pF  
CC  
L
TheLTC3900incorporatesafullrangeofprotectionforthe  
external MOSFETs. A programmable timeout function is  
included that disables both drivers when the synchroniza-  
tion signal is missing or incorrect. Additionally, the chip  
sensestheoutputinductorcurrentthroughthedrain-source  
resistance of the catch MOSFET, shutting off the MOSFET  
if the inductor current reverses. The LTC3900 also shuts  
off the drivers if the supply voltage is too low.  
Undervoltage Lockout  
Small SO-8 Package  
applicaTions  
n
48V Input Isolated DC/DC Converters  
Isolated Telecom Power Supplies  
High Voltage Distributed Power  
Step-Down Converters  
Industrial Control System Power Supplies  
Automotive and Heavy Equipment  
n
n
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
n
n
Typical applicaTion  
ISOLATION  
BARRIER  
L0  
Z
V
3.3V  
40A  
OUT  
V
IN  
36V TO 72V  
+
D3  
C
OUT  
Q
Efficiency  
T1  
C
R
Z
95  
90  
85  
80  
75  
70  
65  
GATE  
OUT  
V
V
= 3.3V  
OUT  
REG  
R
Q1  
CS2  
R
B
R
CS1  
D
= 36V  
Z
IN  
Q3  
+
CS  
V
= 72V  
IN  
OC  
CG  
Q4  
470Ω  
V
IN  
= 48V  
V
CC  
I
SENSE  
–
CS  
R
TMR  
R
CS3  
LTC3900  
10mΩ  
LT1952  
C
TIMER  
VCC  
FG  
C
SG  
C
TMR  
S
OUT  
SYNC  
GND  
COMP  
GND  
T2  
R
SG  
SYNC  
270Ω  
25 30  
LOAD CURRENT (A)  
0
5
10 15 20  
35 40  
R1  
OPTO  
V
IN  
3900 F10b  
LT4430  
COMP  
GND  
OC  
OCI  
FB  
R2  
3900 F01  
Figure 1. Simplified Isolated Synchronous Forward Converter  
3900fb  
1
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