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LTC3812-5 PDF预览

LTC3812-5

更新时间： 2024-11-30 14:58:19
品牌 Logo 应用领域
亚德诺 - ADI 开关控制器
页数 文件大小 规格书
34页 402K
描述
60V 电流模式同步开关稳压控制器

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中文翻译

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LTC3812-5 数据手册

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LTC3812-5  
60V Current Mode  
Synchronous Switching  
Regulator Controller  
FEATURES  
DESCRIPTION  
The LTC3812-5 is a synchronous step-down switching  
regulator controller that can directly step down voltages  
from up to 60V input, making it ideal for telecom and  
automotive applications. The LTC3812-5 uses a constant  
on-time valley current control architecture to deliver very  
low duty cycles with accurate cycle-by-cycle current limit  
without requiring a sense resistor.  
n
High Voltage Operation: Up to 60V  
n
Large 1Ω Gate Drivers  
n
No Current Sense Resistor Required  
n
Dual N-Channel MOSFET Synchronous Drive  
n
Extremely Fast Transient Response  
n
0.5% 0.8V Voltage Reference  
n
Programmable Soft-Start  
n
Generates 5.5V Driver Supply  
A precise internal reference provides 0.5% DC accuracy.  
A high bandwidth (25MHz) error amplifier provides very  
fast line and load transient response. Large 1Ω gate driv-  
ers allow the LTC3812-5 to drive large power MOSFETs  
for higher current applications. The operating frequency  
is selected by an external resistor and is compensated for  
n
Selectable Pulse-Skipping Mode Operation  
n
Power Good Output Voltage Monitor  
n
Adjustable On-Time/Frequency: t  
< 100ns  
ON(MIN)  
n
n
n
n
Adjustable Cycle-by-Cycle Current Limit  
Undervoltage Lockout On Driver Supply  
Output Overvoltage Protection  
variations in V . A shutdown pin allows the LTC3812-5 to  
IN  
Thermally Enhanced 16-Pin TSSOP Package  
be turned off reducing the supply current to <230μA.  
Integrated bias control generates gate drive power from  
theinputsupplyduringstart-upandwhenanoutputshort-  
circuit occurs, with the addition of a small external SOT23  
MOSFET. When in regulation, power is derived from the  
outputforhigherefficiency.  
APPLICATIONS  
n
48V Telecom and Base Station Power Supplies  
n
Networking Equipment, Servers  
n
Automotive and Industrial Control Systems  
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.  
Protected by U.S. Patents including 5481178, 5847554, 6304066, 6476589, 6580258,  
6677210, 6774611.  
TYPICAL APPLICATION  
High Efficiency High Voltage Step-Down Converter  
Efficiency vs Load Current  
100  
V
IN  
6V TO 60V  
R
ON  
+
100k  
C
IN  
22μF  
110k  
V
IN  
= 12V  
95  
90  
85  
M3  
ZXMN-  
10A07F  
I
ON  
NDRV  
100k  
V
= 42V  
IN  
BOOST  
PGOOD  
LTC3812-5  
V
IN  
= 24V  
PGOOD  
M1  
Si7850DP  
L1  
4.7μH  
V
RNG  
TG  
0.1μF  
V
5V  
5A  
OUT  
FCB  
SW  
EXTV  
INTV  
CC  
CC  
RUN/SS  
M2  
Si7850DP  
80  
1000pF  
I
BG  
TH  
10k  
0
1
2
3
4
5
6
47pF  
+
LOAD CURRENT (A)  
D1  
MBR1100  
C
OUT  
270μF  
200k  
5pF  
1μF  
V
PGND  
FB  
38125 TA01b  
SGND  
1.89k  
38125 TA01  
38125fc  
1
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