参数资料
型号: LT1950EGN#TR
厂商: Linear Technology
文件页数: 1/20页
文件大小: 0K
描述: IC REG CTRLR PWM CM 16-SSOP
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 560kHz
占空比: 97%
电源电压: 3 V ~ 25 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)
LT1950
Single Switch PWM
Controller with Auxiliary
Boost Converter
FEATURES
DESCRIPTIO
Wide Input Range: 3V to 25V
Programmable Volt-Second Clamp
Output Power Levels from 25W to 500W
Auxiliary Boost Converter Provides 10V Gate Drive
from V IN as Low as 3V
Programmable Operating Frequency (100kHz to
500kHz) with One External Resistor
Programmable Slope Compensation
Programmable Leading Edge Blanking
± 2% Internal 1.23V Reference
Accurate Shutdown Pin Threshold with
Programmable Hysteresis
60ns Current Sense Delay
2.5V Auxiliary Reference Output
Synchronizable to an External Clock up to 1.5 ? f OSC
Current Mode Control
Small 16-Pin SSOP Package
The LT ? 1950 is a wide input range, forward, boost, flyback
and SEPIC controller that drives an N-channel power
MOSFET with few external components required.
A resistor programmable duty cycle clamp can be used to
generate a volt-second clamp for forward converter appli-
cations. An internal boost switcher is available for creating
a separate supply for the output gate driver, allowing 10V
gate drive from input voltages as low as 3V. The LT1950’s
operating frequency can be set with an external resistor
over a 100kHz to 500kHz range and a SYNC pin allows the
part to be synchronized to an external clock. Additional
programmability exists for leading edge blanking and
slope compensation.
A fast current sense comparator achieves 60ns current
sense delay and the error amplifier is a true voltage mode
error amplifier, allowing a wide range of compensation
APPLICATIO S
networks. An accurate shutdown pin with programmable
hysteresis is available for undervoltage lockout and shut-
Telecom Power Supplies
Automotive Power Supplies
Portable Electronic Equipment
Isolated and Nonisolated DC/DC Converters
down. The LT1950 is available in a small 16-Pin SSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
36V to 72V DC to 26V/5A (Single Switch) Forward Converter
Efficiency vs Load Current
2.5V
0.1 μ F
SLOPE
V REF
BOOST
V IN
V IN2
V SEC
10V BIAS
V IN
470k
MBRB20200
PA0581
47 μ H
47 μ F
V OUT
26V
5A
95
90
85
V IN = 36V
V IN = 48V
V IN = 72V
249k
R OSC SHDN
LT1950
GATE
BLANK
I SENSE
SYNC
PGND
GND
1 μ F
18k
Si7450
0.015 ?
80
75
4.99k
FB
COMP
4.7k
0.022 μ F
100k
70
0.5
1.5
2.5 3.5
LOAD CURRENT (A)
4.5
5.5
1950 TA01a
1950 TA01b
1950fa
1
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LT1950IGN 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LT1950IGN#PBF 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP(0.173",4.40mm 宽) 包装:带卷 (TR)
LT1950IGN#TR 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LT1950IGN#TRPBF 功能描述:IC REG CTRLR PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LT1952 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller