参数资料
型号: LT1952MPGN#PBF
厂商: Linear Technology
文件页数: 1/28页
文件大小: 0K
描述: IC REG CTRLR ISO PWM CM 16-SSOP
标准包装: 100
PWM 型: 电流模式
输出数: 1
频率 - 最大: 560kHz
占空比: 90%
电源电压: 9.25 V ~ 25 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -55°C ~ 125°C
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
包装: 管件
LT1952/LT1952-1
Single Switch Synchronous
Forward Controller
Synchronous Rectifier Control for High Efficiency
Telecommunications Power Supplies
Industrial and Distributed Power
Isolated and Non Isolated DC/DC Converters
FEATURES
n
n Programmable Volt-Second Clamp
n Output Power Levels from 25W to 500W
n Low Current Start-Up
(LT1952: 460μA; V IN On/Off = 14.25V/8.75V)
(LT1952-1: 400μA; V IN On/Off = 7.75V/6.5V)
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 Internal 1.23V Reference
n 2.5V External Reference
n Current Mode Control
n Small 16-Pin SSOP Package
APPLICATIONS
n
n
n
TYPICAL APPLICATION
DESCRIPTION
The LT ? 1952/LT1952-1 are current mode PWM controllers
optimized to control the forward converter topology, 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-
start to provide hiccup short-circuit protection. The LT1952
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
leading edge blanking allow optimization of loop bandwidth
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.
L , LT, LTC and LTM are registered trademarks and ThinSOT is a trademark of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
T1
V IN
PA0905
16V
× 2 × 2
V IN
I SENSE
0.005
52.3k
36V to 72V Input, 12V at 20A Semi-Regulated Bus Converter
L1
40k PA1494.242
SUPPLY FROM BIAS
WINDING OF T1
10μF
V REF V IN
COMP Si7370 PH4840
SS_MAXDC OUT Si7450
LT1952/ OC
LT1952-1
340k
V OUT
12V
20A
47μF
16V
X5R
× 2
16
14
12
12V Bus Converter
V OUT vs V IN
100k
13k
SD_V SEC
FB
SYNC
SOUT
T2
LTC3900
FG CG
SYNC
10
GND
R OSC
220pF
560
8
36
42
48
54
60
66
72
0.1μF
0.1μF
PGND BLANK DELAY
40k
40k
178k
V IN (V)
1952 TA01b
1952 TA01
19521fe
1
相关PDF资料
PDF描述
VI-B5Z-EU-F1 CONVERTER MOD DC/DC 2V 80W
VE-J7Y-EY-F4 CONVERTER MOD DC/DC 3.3V 33W
LTC1439IGW#TRPBF IC REG CTRLR BUCK PWM CM 36-SSOP
NCP305LSQ15T1G IC VOLT DETECT OD 1.5V SC-82AB
VE-J7Y-EY-F3 CONVERTER MOD DC/DC 3.3V 33W
相关代理商/技术参数
参数描述
LT1956 制造商:LINEAR 制造商全称:LINEAR 功能描述:100V Synchronous Switching Regulator Controller
LT1956-5 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, 1.5A, 500kHz Step-Down Switching Regulators
LT1956EFE 功能描述:IC REG BUCK ADJ 1.5A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压(升压) 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型,TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT
LT1956EFE#PBF 功能描述:IC REG BUCK ADJ 1.5A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON(1.45x1) 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2
LT1956EFE#TR 功能描述:IC REG BUCK ADJ 1.5A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压(升压) 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型,TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT