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LT3845EN

更新时间： 2024-11-01 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
26页 248K
描述
High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency

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中文翻译

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LT3845EN 数据手册

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LT3845  
High Voltage Synchronous  
Current Mode Step-Down  
Controller with Adjustable  
Operating Frequency  
FEATURES  
DESCRIPTION  
The LT®3845 is a high voltage, synchronous, current  
mode controller used for medium to high power, high  
efficiency supplies. It offers a wide 4V to 60V input range  
(7.5V minimum start-up voltage). An onboard regulator  
simplifies the biasing requirements by providing IC power  
■
High Voltage Operation: Up to 60V  
■
Synchronizable Up to 600kHz  
■
Adjustable Constant Frequency: 100kHz to 500kHz  
■
Output Voltages Up to 36V  
■
Adaptive Nonoverlap Circuitry Prevents Switch  
Shoot-Through  
directly from V .  
IN  
■
Reverse Inductor Current Inhibit for Discontinuous  
Burst Mode® operation maintains high efficiency at light  
loads by reducing IC quiescent current to 120μA. Light  
load efficiency is also improved with the reverse inductor  
current inhibit function which supports discontinuous  
operation.  
Operation Improves Efficiency with Light Loads  
■
Programmable Soft-Start  
■
120μA No Load Quiescent Current  
■
10μA Shutdown Supply Current  
■
1% Regulation Accuracy  
■
Additional features include adjustable fixed operating  
frequency that can be synchronized to an external clock  
for noise sensitive applications, gate drivers capable of  
drivinglargeN-channelMOSFETs,aprecisionundervoltage  
lockout, 10μA shutdown current, short-circuit protection  
and a programmable soft-start.  
Standard Gate N-Channel Power MOSFETs  
■
Current Limit Unaffected by Duty Cycle  
■
Reverse Overcurrent Protection  
■
16-Lead Thermally Enhanced TSSOP Package,  
16-Pin PDIP  
APPLICATIONS  
The LT3845 is available in a 16-lead thermally enhanced  
TSSOP package and 16-pin through hole N package.  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.. Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.  
■
12V and 42V Automotive and Heavy Equipment  
■
48V Telecom Power Supplies  
■
Avionics and Industrial Control Systems  
Distributed Power Converters  
■
TYPICAL APPLICATION  
Efficiency and Power Loss vs  
Load Current  
High Voltage Step-Down Regulator 48V to 12V at 75W  
V
IN  
20V TO 55V  
100  
95  
90  
85  
80  
75  
70  
65  
7
6
5
4
3
2
1
0
V
IN  
= 48V  
0.1μF  
2.2μF  
100V  
1M  
V
BOOST  
TG  
IN  
47μF  
63V  
Si7370DP  
SHDN  
V
0.01Ω  
LT3845  
OUT  
1500pF  
C
SW  
12V  
82.5k  
SS  
BAS521  
15μH  
B160  
75W  
BURST_EN  
V
CC  
33μF  
×3  
Si7370DP  
V
V
BG  
FB  
C
20k  
PGND  
LOSS  
100pF  
16.2k  
+
SYNC  
SENSE  
2200pF  
–
1μF  
f
SENSE  
SET  
SGND  
49.9k  
0.1  
10  
1N4148  
1
143k  
LOAD CURENT (A)  
3845 TA01a  
3845 TA01b  
3845fd  
1
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