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参数资料
| 型号： | LT1572CS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 1.25A 16SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压），反相，Cuk，回扫，正向转换器，Sepic |
| 输出数： | 1 |
| 输入电压： | 3 V ~ 30 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 1.25A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SOIC |
LT1572
OPERATIO
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
V IN
Synchronizing with Bipolar Transistor
LT1572
( )( )
? q ? t S S ? I C + R 3 ?
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:
? KT ? ? V C ?
f
? ? ? ?
? V OS =
I C
GND
V C
R3
C1
2N2369
C2
39pF
R2
2.2k
R1
3k
FROM 5V
LOGIC
1572 OP01
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”
V IN
Synchronizing with MOS Transistor
LT1572
in frequency compensation network.
GND
V C
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
R3
VN2222*
D1
1N4158
C2
100pF
reduced to a much lower value. Also, the synchronizing
transistor must sink higher currents with low values of R3,
C1
R2
2.2k
D2
1N4158
FROM 5V
LOGIC
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.
10
*SILICONIX OR EQUIVALENT
1572 OP02
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LT1573C | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Dropout PNP Regulator Driver |
| LT1573CS8 | 功能描述:IC REG CTRLR SGL POS ADJ 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1573CS8#PBF | 功能描述:IC REG CTRLR SGL POS ADJ 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
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