- 您现在的位置：买卖IC网 > PDF目录44530 > LM1575J-3.3/883 (NATIONAL SEMICONDUCTOR CORP) 3.2 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, CDIP16 PDF资料下载
参数资料
| 型号： | LM1575J-3.3/883 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, CDIP16 |
| 封装： | CERAMIC, DIP-16 |
| 文件页数： | 15/27页 |
| 文件大小： | 725K |
| 代理商： | LM1575J-3.3/883 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页当前第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
Additional Applications (Continued)
Definition of Terms
BUCK REGULATOR
A switching regulator topology in which a higher voltage is
converted to a lower voltage. Also known as a step-down
switching regulator.
BUCK-BOOST REGULATOR
A switching regulator topology in which a positive voltage is
converted to a negative voltage without a transformer.
DUTY CYCLE (D)
Ratio of the output switch’s on-time to the oscillator period.
CATCH DIODE OR CURRENT STEERING DIODE
The diode which provides a return path for the load current
when the LM2575 switch is OFF.
EFFICIENCY (
η)
The proportion of input power actually delivered to the load.
CAPACITOR EQUIVALENT SERIES RESISTANCE (ESR)
The purely resistive component of a real capacitor’s imped-
ance (see Figure 16). It causes power loss resulting in
capacitor heating, which directly affects the capacitor’s op-
erating lifetime. When used as a switching regulator output
filter, higher ESR values result in higher output ripple volt-
ages.
Most standard aluminum electrolytic capacitors in the
100 F–1000 F range have 0.5
to 0.1 ESR. Higher-
grade capacitors (“low-ESR”, “high-frequency”, or “low-
inductance”’) in the 100 F–1000 F range generally have
ESR of less than 0.15
.
EQUIVALENT SERIES INDUCTANCE (ESL)
The pure inductance component of a capacitor (see Figure
16). The amount of inductance is determined to a large
extent on the capacitor’s construction. In a buck regulator,
this unwanted inductance causes voltage spikes to appear
on the output.
OUTPUT RIPPLE VOLTAGE
The AC component of the switching regulator’s output volt-
age. It is usually dominated by the output capacitor’s ESR
multiplied by the inductor’s ripple current (
I
IND). The peak-
to-peak value of this sawtooth ripple current can be deter-
mined by reading the Inductor Ripple Current section of the
Application hints.
CAPACITOR RIPPLE CURRENT
RMS value of the maximum allowable alternating current at
which a capacitor can be operated continuously at a speci-
fied temperature.
STANDBY QUIESCENT CURRENT (I
STBY)
Supply current required by the LM2575 when in the standby
mode (ON /OFF pin is driven to TTL-high voltage, thus
turning the output switch OFF).
INDUCTOR RIPPLE CURRENT (
I
IND)
The peak-to-peak value of the inductor current waveform,
typically a sawtooth waveform when the regulator is operat-
ing in the continuous mode (vs. discontinuous mode).
01147520
Note: Pin numbers are for the TO-220 package.
FIGURE 15. 1.2V to 55V Adjustable 1A Power Supply with Low Output Ripple
01147521
FIGURE 16. Simple Model of a Real Capacitor
LM1575/LM2575/LM2575HV
www.national.com
22
相关PDF资料 |
PDF描述 |
|---|---|
| LM1575WG-15-QML | 3 A SWITCHING REGULATOR, 58 kHz SWITCHING FREQ-MAX, CDSO16 |
| LM1575K-15-QML | 3 A SWITCHING REGULATOR, 58 kHz SWITCHING FREQ-MAX, MBFM2 |
| LM185BWG/883 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, CDSO10 |
| 5962-9091402QYA | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, CDSO10 |
| 5962-9091401MXA | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, MBCY3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM1575J-5.0-QML | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4V to 40V 16-Pin CDIP |
| LM1575J-ADJ-QML | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4V to 40V 16-Pin CDIP |
| LM1575K-12 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller |
| LM1575K-12/883 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller |
| LM1575K-12/883C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
发布紧急采购，3分钟左右您将得到回复。