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LT1952-1

更新时间： 2024-10-03 05:43:27
品牌 Logo 应用领域
凌特 - Linear 开关控制器
页数 文件大小 规格书
24页 230K
描述
Single Switch Synchronous Forward Controller

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LT1952-1 数据手册

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LT1952/LT1952-1  
Single Switch Synchronous  
Forward Controller  
FEATURES  
DESCRIPTION  
TheLT®1952/LT1952-1arecurrentmodePWMcontrollers  
optimizedtocontroltheforwardconvertertopology,using  
one primary MOSFET. The LT1952/LT1952-1 provide  
synchronous rectifier control, resulting in extremely  
high efficiency. A programmable Volt-Second clamp  
provides a safeguard for transformer reset that prevents  
saturation. This allows a single MOSFET on the primary  
side to reliably run at greater than 50% duty cycle for high  
MOSFET, transformer and rectifier utilization. The devices  
include soft-start for controlled exit from shutdown and  
undervoltage lockout. A precision 107mV current limit  
threshold, independent of duty cycle, combines with soft-  
starttoprovidehiccupshort-circuitprotection.TheLT1952  
is optimized for micropower bootstrap start-up from high  
input voltages. The LT1952-1 allows start-up from lower  
input voltages. Programmable slope compensation and  
leadingedgeblankingallowoptimizationofloopbandwidth  
with a wide range of inductors and MOSFETs. Each device  
can be programmed over a 100kHz to 500kHz frequency  
range and the part can be synchronized to an external  
clock. The error amplifier is a true op amp, allowing a wide  
range of compensation networks. The LT1952/LT1952-1  
are available in a small 16-pin SSOP package.  
n
Synchronous Rectifier Control for High Efficiency  
n
Programmable Volt-Second Clamp  
n
Output Power Levels from 25W to 500W  
n
Low Current Start-Up  
(LT1952: 460μA; V On/Off = 14.25V/8.75V)  
IN  
(LT1952-1: 400μA; V On/Off = 7.75V/6.5V)  
IN  
n
True PWM Soft-Start  
n
Low Stress Short-Circuit Protection  
n
Precision 107mV Current Limit Threshold  
n
Adjustable Delay for Synchronous Timing  
n
Accurate Shutdown Threshold with Programmable  
Hysteresis  
n
Programmable Slope Compensation  
n
Programmable Leading Edge Blanking  
n
Programmable Frequency (100kHz to 500kHz)  
n
Synchronizable to an External Clock up to 1.5 • f  
OSC  
n
n
n
n
Internal 1.23V Reference  
2.5V External Reference  
Current Mode Control  
Small 16-Pin SSOP Package  
APPLICATIONS  
n
Telecommunications Power Supplies  
n
Industrial and Distributed Power  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
n
Isolated and Non Isolated DC/DC Converters  
TYPICAL APPLICATION  
36V to 72V Input, 12V at 20A Semi-Regulated Bus Converter  
12V Bus Converter  
OUT vs VIN  
L1  
V
T1  
V
IN  
PA1494.242  
V
12V  
20A  
PA0905  
OUT  
SUPPLY FROM BIAS  
WINDING OF T1  
16  
14  
12  
10  
8
10μF  
47μF  
16V  
X5R  
s2  
V
V
IN  
REF  
52.3k  
100k  
Si7370  
s2  
PH4840  
s2  
COMP  
Si7450  
SS_MAXDC  
OUT  
OC  
V
IN  
340k  
LT1952/  
LT1952-1  
I
0.005Ω  
T2  
SENSE  
SD_V  
FB  
SEC  
LTC3900  
FG  
CG  
13k  
SYNC  
GND  
SOUT  
SYNC  
560Ω  
R
220pF  
OSC  
36  
48  
54  
(V)  
60  
66  
72  
42  
V
PGND BLANK DELAY  
40k 40k  
IN  
0.1μF  
0.1μF  
1952 TA01b  
178k  
1952 TA01  
19521fd  
1
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