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参数资料
| 型号： | LT1572CS |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 100kHz, 1.25A Switching Regulator with Catch Diode |
| 中文描述： | 1.25 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SO-16 |
| 文件页数： | 7/12页 |
| 文件大小： | 257K |
| 代理商： | LT1572CS |
7
LT1572
W
IAGRA
BLOCK
1.24V
REF
1572 BD
ERROR
AMP
+
100kHz
OSC
2.3V
REG
V
IN
FB
–
+
–
SHUTDOWN
CIRCUIT
V
C
COMP
LOGIC
DRIVER
ANTI-
SAT
FLYBACK
ERROR
AMP
16V
SWITCH
OUT
5A, 75V
SWITCH
CURRENT
AMP
GAIN 6
0.15V
0.16
*ALWAYS CONNECT E1 TO GROUND
MODE
SELECT
E1*
E2
LT1172
ANODE
CATHODE
OPERATIOU
The LT1572 is a current mode switcher. This means that
switch duty cycle is directly controlled by switch current
rather than by output voltage. Referring to the block
diagram, the switch is turned “on” at the start of each
oscillator cycle. It is turned “off” when switch current
reaches a predetermined level. Control of output voltage is
obtained by using the output of a voltage sensing error
amplifier to set current trip level. This technique has
several advantages. First, it has immediate response to
input voltage variations, unlike ordinary switchers which
have notoriously poor line transient response. Second, it
reduces the 90
°
phase shift at mid-frequencies in the
energy storage inductor. This greatly simplifies closed-
loop frequency compensation under widely varying input
voltage or output load conditions. Finally, it allows simple
pulse-by-pulse current limiting to provide maximum switch
protection under output overload or short conditions.
A low dropout internal regulator provides a 2.3V supply for
all internal circuitry on the LT1572. This low dropout
design allows input voltage to vary from 3V to 40V with
virtually no change in device performance. A 100kHz
oscillator is the basic clock for all internal timing. It turns
“on” the output switch via the logic and driver circuitry.
Special adaptive anti-sat circuitry detects onset of satura-
tion in the power switch and adjusts driver current instan-
taneously to limit switch saturation. This minimizes driver
dissipation and provides very rapid turn-off of the switch.
A 1.2V bandgap reference biases the positive input of the
error amplifier. The negative input is brought out for
output voltage sensing. This feedback pin has a second
function; when pulled low with an external resistor, it
programs the LT1572 to disconnect the main error ampli-
fier output and connects the output of the flyback amplifier
相关PDF资料 |
PDF描述 |
|---|---|
| LT1572 | 100kHz, 1.25A Switching Regulator with Catch Diode(100kHz, 1.25A 开关稳压器(带箝位二极管）) |
| LT1573C | Low Dropout PNP Regulator Driver |
| LT1573CS8 | Low Dropout PNP Regulator Driver |
| LT1573CS8-2.5 | Low Dropout PNP Regulator Driver |
| LT1573CS8-2.8 | Low Dropout PNP Regulator Driver |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1572CS#PBF | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1572CS#TR | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1572CS#TRPBF | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1573 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Dropout PNP Regulator Driver |
| LT-1573-111-024 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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