參數(shù)資料
型號(hào)： LM20145
廠商： National Semiconductor Corporation
英文描述： 5A, PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator
中文描述： 第5A，頻率可調(diào)的PowerWise㈢同步降壓穩(wěn)壓器
文件頁(yè)數(shù)： 4/22頁(yè)
文件大?。?/td> 601K
代理商： LM20145
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Enable
V
IH_EN
V
EN_HYS
EN Pin turn-on Threshold
V
EN
Rising
1.08
1.18
1.28
V
EN Pin Hysteresis
66
mV
Thermal Shutdown
T
SD
T
SD_HYS
Thermal Resistance
θ
JA
Thermal Shutdown
160
°C
Thermal Shutdown Hysteresis
10
°C
Junction to Ambient
38
°C/W
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2:
The maximum allowable power dissipation is a function of the maximum junction temperature, T
, the junctions-to-ambient thermal resistance,
θ
JA
,
and the ambient temperature, T
. The maximum allowable power dissipation at any ambient temperature is calculated using: P
D_MAX
= (T
J_MAX
– T
A
)/θ
JA
. The
maximum power dissipations of 2.6W is determined using T
A
= 25°C,
θ
JA
= 38°C/W, and T
J_MAX
= 125°C.
Note 3:
The human body model is a 100 pF capacitor discharged through a 1.5 k
resistor to each pin.
Typical Performance Characteristics
(Coilcraft MSS1038), V
IN
= 5V, V
OUT
= 1.2V, R
LOAD
= 1.2
, f
SW
= 500 kHz, T
A
= 25°C for efficiency curves, loop gain plots and
waveforms, and T
J
= 25°C for all others.
Unless otherwise specified: C
IN
= C
OUT
= 100 μF, L = 1.5 μH
Efficiency vs. Load Current (V
IN
= 5V)
30030731
Efficiency vs. Load Current (V
IN
= 3.3V)
30030730
High-Side FET Resistance vs. Temperature
30030757
Low-Side FET Resistance vs. Temperature
30030758
www.national.com
4
L
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM20145_08 制造商:NSC 制造商全稱:National Semiconductor 功能描述:5A, PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator
LM20145CS-A 制造商:CEC Industries 功能描述:LED, RPL, BULB, AMBER, T-6, E12, Lamp Base Type:Candelabra Screw, LED Color:Ambe
LM20145CS-B 制造商:CEC Industries 功能描述:LED, RPL, BULB, BLUE, T-6, E12; Lamp Base Type:Candelabra Screw; LED Color:Blue; Wavelength Typ:470nm; Power Rating:720mW; Bulb Size:T-6; Supply Voltage:145V; Current Rating:30mA; Average Bulb Life:100000h; Beam Divergence:360 ;RoHS Compliant: No
LM20145CS-G 制造商:CEC Industries 功能描述:LED, RPL, BULB, GREEN, T-6, E12; Lamp Base Type:Candelabra Screw; LED Color:Green; Wavelength Typ:525nm; Power Rating:720mW; Bulb Size:T-6; Supply Voltage:145V; Current Rating:30mA; Average Bulb Life:100000h; Beam Divergence:360 ;RoHS Compliant: No
LM20145CS-R 制造商:CEC Industries 功能描述:LED, RPL, BULB, RED, T-6, E12; Lamp Base Type:Candelabra Screw; LED Color:Red; Wavelength Typ:629nm; Power Rating:720mW; Bulb Size:T-6; Supply Voltage:145V; Current Rating:30mA; Average Bulb Life:100000h; Beam Divergence:360 ;RoHS Compliant: No
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