Texas Instruments 36V, 2A PowerWise® Adjustable Frequency Synchronous Buck Regulator Evaluation Module LM20242EVAL/NOPB LM20242EVAL/NOPB Datenbogen
Produktcode
LM20242EVAL/NOPB
SNVS534E – OCTOBER 2007 – REVISED MARCH 2013
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise stated, the following conditions apply: V
VIN
= 12V. Limits in standard type are for T
J
= 25°C only, limits in
bold face type apply over the junction temperature (T
J
) 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 T
J
= 25°C,
and are provided for reference purposes only.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Oscillator
F
SW1
Switching Frequency 1
R
RT
= 49.9 k
Ω
675
750
825
kHz
F
SW2
Switching Frequency 2
R
RT
= 249 k
Ω
225
250
325
kHz
D
MAX
Maximum Duty Cycle
I
LOAD
= 0A
90
%
V
RT
RT pin voltage
R
RT
= 250 k
Ω
550
mV
Error Amplifier
I
FB
Feedback pin bias current
V
FB
= 1V
50
nA
I
COMP(SRC)
COMP Output Source Current
V
FB
= 0V
200
400
µA
V
COMP
= 0V
I
COMP(SNK)
COMP Output Sink Current
V
FB
= 1V
200
350
µA
V
COMP
= 0.5V
g
m
Error Amplifier DC Transconductance
I
COMP
= -50 µA to +50 µA
400
515
600
µmho
A
VOL
Error Amplifier Voltage Gain
COMP pin open
2000
V/V
GBW
Error Amplifier Gain-Bandwidth Product
COMP pin open
7
MHz
Current Limit
I
LIM
Cycle By Cycle Current Limit
3.1
3.7
4.65
A
T
ILIM
Cycle By Cycle Current Limit Delay
150
ns
Enable
V
EN(RISING)
EN Pin Rising Threshold
1.2
1.25
1.3
V
V
EN(HYS)
EN Pin Hysteresis
50
mV
I
EN
EN Source Current
V
EN
= 0V, V
VIN
= 12V
2
µA
Thermal Shutdown
T
SD
Thermal Shutdown
170
°C
T
SD(HYS)
Thermal Shutdown Hysteresis
20
°C
Thermal Resistance
θ
JC
Junction to Case
5.6
°C/W
θ
JA
Junction to Ambient
0 LFM airflow
30
°C/W
4
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