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参数资料
| 型号： | LSP3170SD |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 4/10页 |
| 文件大小： | 244K |
| 代理商： | LSP3170SD |
Liteon Semiconductor Corporation
LSP3170
2A Step Down DC/DC Converter
Rev1.5
3/10
FUNCTIONAL BLOCK DIAGRAM
FUNCTIONAL DESCRIPTION
As seen in the above Figure, Functional Block Diagram, the LSP3170 is a current mode pulse width modulation
(PWM) converter. The converter operates as follows:
The LSP3170 is a current mode buck converter regulator.LSP3170 has an internal fixed-frequency clock. It uses two
feedback loops that control the duty cycle of the internal power switch. The error amplifier functions like that of the
voltage mode converter. The output of the error amplifier works as a switch current reference. This technique
effectively removes one of the double poles in the voltage mode system. With this, it is much simpler to compensate
a current mode converter to have better performance. The current sense amplifier in the LSP3170 monitors the
switch current during each cycle. Overcurrent protection (OCP) is triggered when the current limit exceeds the upper
limit of 2.6A, detected by a voltage on COMP greater than about 2V. When an OCP fault is detected, the switch is
turned off and the external COMP capacitor is quickly discharged using an internal npn transistor. Once the COMP
voltage has fallen below 250mV, an internal timer prevents any operation for 50s, after which the part enters a
normal startup cycle. In the case of sustained over current or dead-short, the part will continually cycle through the
retry sequence as described above, at a rate dependent on the value of Ccomp.
The COMP voltage is the integration of the error between FB input and the internal 1.222V reference. If FB is lower
than the reference voltage, COMP tends to go higher to increase current to the output. Current limit happens when
COMP reaches its maximum clamp value of 2.55V.
Shutdown control
The LSP3170 has an enable input EN for turning the IC on or off. When EN is less than 2.0V, the IC is in 15A low
current shutdown mode and output is discharged through the Low-Side Power Switch. When EN is higher than 2.5V,
the IC is in normal operation mode. EN is internally pulled up with a 2A current source and can be left unconnected
for always-on operation. Note that EN is a low voltage input with a maximum voltage of 7V; it should never be
directly connected to IN.
Thermal Shutdown
The LSP3170 automatically turns off when its junction temperature exceeds 160°C.
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