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LT3782A

更新时间： 2024-09-24 05:43:35
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
20页 232K
描述
2-Phase Step-Up DC/DC Controller

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中文翻译

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LT3782A 数据手册

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LT3782A  
2-Phase Step-Up  
DC/DC Controller  
FEATURES  
DESCRIPTION  
The LT®3782A is a current mode 2-phase step-up DC/DC  
converter controller. Its high switching frequency (up to  
500kHz) and 2-phase operation reduce system filtering  
capacitance and inductance requirements.  
n
2-Phase Operation Reduces Required Input and  
Output Capacitance  
n
Programmable Switching Frequency:  
150kHz to 500kHz  
6V to 40V Input Range  
10V Gate Drive with V ≥13V  
High Current Gate Drive (4A)  
Programmable Soft-Start and Current Limit  
Programmable Slope Compensation for  
High Noise Immunity  
MOSFET Gate Signals with Programmable  
Falling Edge Delay for External Synchronous  
Drivers  
n
With 10V gate drive (V ≥13V) and 4A peak drive current,  
CC  
n
CC  
the LT3782A can drive most industrial grade high power  
MOSFETs with high efficiency. For synchronous applica-  
tions, the LT3782A provides synchronous gate signals  
with programmable falling edge delay to avoid cross  
conduction when using external MOSFET drivers. Other  
features include programmable undervoltage lockout,  
soft-start, current limit, duty cycle clamp (50% or higher)  
and slope compensation. The LT3782A is identical to the  
LT3782exceptthattheLT3782Ahasatightercurrentsense  
mismatch tolerance.  
n
n
n
n
n
n
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Programmable Undervoltage Lockout  
Programmable Duty Cycle Clamp (50% or Higher)  
Thermally Enhanced 28-Lead TSSOP and 4mm × 5mm  
QFN Packages  
The LT3782A is available in thermally enhanced 28-lead  
TSSOP and 4mm × 5mm QFN packages.  
APPLICATIONS  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 6144194.  
n
Industrial Equipment  
n
n
Telecom Infrastructure  
Interleaved Isolated Power Supply  
TYPICAL APPLICATION  
50V 4A Boost Converter  
20μH  
V
OUT  
50V, 4A  
V
IN  
10V TO 36V  
10μF  
×2  
D1  
Efficiency and Power Loss  
vs Load Current  
V
GBIAS1  
20μH  
CC  
1μF  
GBIAS2  
GBIAS  
825k  
274k  
2μF  
D2  
+
97  
95  
93  
91  
89  
87  
85  
18  
15  
12  
9
10μF  
×2  
220μF  
RUN  
V
= 24V  
IN  
EFFICIENCY  
BGATE1  
V
= 12V  
IN  
LT3782A  
0.004Ω  
V
EE1  
BGATE2  
V
IN  
= 12V  
59k  
SLOPE  
DELAY  
DCL  
V
IN  
= 24V  
6
80k  
POWER LOSS  
0.004Ω  
3
R
SET  
V
EE2  
+
10Ω  
10nF  
10Ω  
10nF  
0
SS  
0
1
2
3
4
5
SENSE1  
SENSE1  
0.1μF  
I
(A)  
OUT  
–
3782A TA01b  
V
C
475k  
+
–
13k  
6.8nF  
SENSE2  
SENSE2  
100pF  
24.9k  
FB  
GND  
3782A TA01  
3782af  
1
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