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參數資料
| 型號： | MSP1250 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Power Converter 150kHz 3A Step-down Voltage Regulator |
| 中文描述： | 150kHz的第3A電源轉換器降壓穩壓器 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 213K |
| 代理商： | MSP1250 |
MSP1250
Power Converter 150kHz 3A
Step-down Voltage Regulator
General Description
The MSP1250 series of regulators are monolithic integrated circuits that provide all the
active functions for a step-down (buck) switching regulator, capable of driving a 3A load
with excellent line and load regulation. These devices are avail-able in fixed output voltages
of 3.3V, 5V, 12V, and an adjust-able output version.
Requiring a minimum number of external components, these regulators are simple to use
and include internal frequency compensation, and a fixed-frequency oscillator.
The MSP1250 series operates at a switching frequency of 150 kHz thus allowing smaller
sized filter components than what would be needed with lower frequency switching
regulators. Available in a standard 5-lead TO-220 package with several different lead bend
options, and a 5-lead TO-263 surface mount package. A standard series of inductors are
available from several different manufacturers optimized for use with the MSP1250 series.
This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage under specified input
voltage and output load conditions, and ±15% on the oscillator frequency. External
shutdown is included, featuring typically 80 μA standby current. Self-protection features
include a two stage frequency reducing current limit for the output switch and an over tem
perature shutdown for complete protection under fault conditions.
Features
3.3V, 5V, 12V, and adjustable output versions
Adjustable version output voltage range, 1.2V to 37V±4% max over line and load
conditions
Available in TO-220 and TO-263 packages
Guaranteed 3A output load current
Input voltage range up to 40V
Requires only 4 external components
Excellent line and load regulation specifications
150 kHz fixed frequency internal oscillator
TTL shutdown capability
Low power standby mode, I
Q
typically 80 μA
High efficiency
Uses readily available standard inductors
Thermal shutdown and current limit protection
Applications
Simple high-efficiency step-down (buck) regulator
On-card switching regulators
Positive to negative converter
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