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LM20242 Scheda tecnica(PDF) 4 Page - Texas Instruments

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Il numero della parte LM20242
Spiegazioni elettronici  36V, 2A PowerWise짰 Adjustable Frequency Synchronous Buck Regulator
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM20242
SNVS534D – OCTOBER 2007 – REVISED MAY 2008
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise stated, the following conditions apply: VVIN = 12V. Limits in standard type are for TJ = 25°C only, limits in
bold face type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are
specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C,
and are provided for reference purposes only.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Oscillator
FSW1
Switching Frequency 1
RRT = 49.9 kΩ
675
750
825
kHz
FSW2
Switching Frequency 2
RRT = 249 kΩ
225
250
325
kHz
DMAX
Maximum Duty Cycle
ILOAD = 0A
90
%
VRT
RT pin voltage
RRT = 250 kΩ
550
mV
Error Amplifier
IFB
Feedback pin bias current
VFB = 1V
50
nA
ICOMP(SRC)
COMP Output Source Current
VFB = 0V
200
400
µA
VCOMP = 0V
ICOMP(SNK)
COMP Output Sink Current
VFB = 1V
200
350
µA
VCOMP = 0.5V
gm
Error Amplifier DC Transconductance
ICOMP = -50 µA to +50 µA
400
515
600
µmho
AVOL
Error Amplifier Voltage Gain
COMP pin open
2000
V/V
GBW
Error Amplifier Gain-Bandwidth Product
COMP pin open
7
MHz
Current Limit
ILIM
Cycle By Cycle Current Limit
3.1
3.7
4.65
A
TILIM
Cycle By Cycle Current Limit Delay
150
ns
Enable
VEN(RISING)
EN Pin Rising Threshold
1.2
1.25
1.3
V
VEN(HYS)
EN Pin Hysteresis
50
mV
IEN
EN Source Current
VEN = 0V, VVIN = 12V
2
µA
Thermal Shutdown
TSD
Thermal Shutdown
170
°C
TSD(HYS)
Thermal Shutdown Hysteresis
20
°C
Thermal Resistance
θJC
Junction to Case
5.6
°C/W
θJA
Junction to Ambient
0 LFM airflow
30
°C/W
4
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