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参数资料
| 型号： | LT1572 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | 100kHz, 1.25A Switching Regulator with Catch Diode(100kHz, 1.25A 开关稳压器(带箝位二极管）) |
| 中文描述： | 100kHz时，1.25A的开关稳压抓住二极管（100kHz时，1.25A的开关稳压器（带钳位二极管）） |
| 文件页数： | 10/12页 |
| 文件大小： | 222K |
| 代理商： | LT1572 |
10
LT1572
OPERATIOU
Synchronizing
The LT1572 can be externally synchronized in the fre-
quency range of 120kHz to 160kHz. This is accomplished
as shown in the accompanying figures. Synchronizing
occurs when the V
C
pin is pulled to ground with an external
transistor. To avoid disturbing the DC characteristics of
the internal error amplifier, the width of the synchronizing
pulse should be under 0.3
μ
s. C2 sets the pulse width at
0.2
μ
s. The effect of a synchronizing pulse on the LT1572
amplifier offset can be calculated from:
V
KT
q
t
f
I
V
R
I
OS
S
S
C
C
3
C
=
( )( )
+
KT = 26mV at 25
°
C
q
t
S
= pulse width
f
S
= pulse frequency
I
C
= V
C
source current (
≈
200
μ
A)
V
C
= operating V
C
voltage (1V to 2V)
R3 = resistor used to set mid-frequency “zero”
n frequency compensation network.
With t
S
= 0.2
μ
s, f
S
= 150kHz, V
C
= 1.5V, and R3 = 2k, offset
voltage shift is
≈
3.8mV. This is not particularly bother-
some, but note that high offsets could result if R3 were
reduced to a much lower value. Also, the synchronizing
transistor must sink higher currents with low values of R3,
so larger drives may have to be used. The transistor must
be capable of pulling the V
C
pin to within 200mV of ground
to ensure synchronizing.
Synchronizing with Bipolar Transistor
1572 OP01
C2
39pF
R1
3k
R2
2.2k
LT1572
GND
V
IN
V
C
C1
R3
2N2369
FROM 5V
LOGIC
Synchronizing with MOS Transistor
1572 OP02
D1
1N4158
R2
2.2k
LT1572
GND
V
IN
V
C
C1
R3
FROM 5V
LOGIC
C2
100pF
D2
1N4158
*SILICONIX OR EQUIVALENT
VN2222*
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相关代理商/技术参数 |
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|---|---|
| LT1572CS | 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#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 |
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