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| 型号： | LT3509HMSE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件页数： | 24/24页 |
| 文件大小： | 271K |
| 代理商： | LT3509HMSE#TRPBF |
LT3509
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3509fc
APPLICATIONS INFORMATION
Shutdown and Soft Start
When the RUN/SS pins are pulled to ground, the part will
shut down to its lowest current state of approximately
9μA. If driving a large capacitive load it may be desirable
to use the current limiting soft-start feature. Connecting
capacitors to ground from the RUN/SS pins will control
the delay until full current is available. The pull-up current
is 1μA and the full current threshold is 2V so the start-up
time is given by:
T = 2 C 106 s
For example a 0.005μF capacitor will give a time to full
current of 10ms. If both outputs can come up together
then the two inputs can be paralleled and tied to one ca-
pacitor. In this case use twice the capacitor value to obtain
the same start-up time. During the soft-start time both
the peak current threshold and the DA current threshold
will track so the part will skip pulses as required to limit
the maximum inductor current. Starting up into a large
capacitor is not much different to starting into a short-
circuit in this respect.
Setting The Output Voltage
The output voltage is programmed with a resistor divider
between the output and the FB pin. Choose the resistors
according to:
R1=R2
VOUT
0.8
–1
The designators correspond to Figure 1. R2 should be 20k
or less to avoid bias current errors.
Frequency Setting
The timing resistor, RT, for any desired frequency in the
range 264kHz to 2.2MHz can be calculated from the
following formula:
RT =
1.215
fSW
– 0.215 40.2
where fSW is in MHz and RT is in kΩ.
Table 1. Standard E96 Resistors for Common Frequencies
FREQUENCY
TIMING RESISTOR RT (kΩ)
264 kHz
178
300 kHz
154
400kHz
113
500kHz
88.7
1MHz
40.2
2MHz
15.8
2.2MHz
13.7
Note: The device is specied for operation down to 300kHz. The 264kHz
value is to allow external synchronization at 300kHz
Figure 2. Soft-Start
IL
0.2A/DIV
VSW
10V/DIV
VOUT
5V/DIV
TIME 1ms/DIV
3509 F02
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相关代理商/技术参数 |
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| LT3509IDE#PBF | 功能描述:IC REG BUCK ADJ 0.7A DL 14DFN 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 |
| LT3509IDE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.2MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.2MHZ, DFN-14 |
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| LT3509IDE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 36V, 700mA Step-Down Regulator |
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