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LM3481-Q1 Datenblatt(PDF) 5 Page - Texas Instruments

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Teilenummer LM3481-Q1
Bauteilbeschribung  LM3481 / -Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3481-Q1 Datenblatt(HTML) 5 Page - Texas Instruments

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LM3481, LM3481-Q1
www.ti.com
SNVS346F – NOVEMBER 2007 – REVISED NOVEMBER 2014
6.5 Thermal Information
LM3481
THERMAL METRIC(1)
VSSOP
UNIT
10 PINS
RθJA
Junction-to-ambient thermal resistance
157.3
RθJC(top)
Junction-to-case (top) thermal resistance
51.1
RθJB
Junction-to-board thermal resistance
76.9
°C/W
ψJT
Junction-to-top characterization parameter
5.0
ψJB
Junction-to-board characterization parameter
75.6
RθJC(bot)
Junction-to-case (bottom) thermal resistance
-
(1)
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
6.6 Electrical Characteristics
VIN= 12 V, RFA= 40 kΩ, TJ = 25°C, unless otherwise indicated.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VCOMP = 1.4 V, 2.97 ≤ VIN ≤ 48 V
1.275
VFB
Feedback Voltage
V
VCOMP = 1.4 V, 2.97 ≤ VIN ≤ 48 V,
1.256
1.294
–40°C
≤ TJ ≤ 125°C
ΔVLINE
Feedback Voltage Line Regulation
2.97
≤ VIN ≤ 48 V
0.003
%/V
ΔVLOAD
Output Voltage Load Regulation
IEAO Source/Sink
±0.5
%/A
VUVLO Ramping Down
1.430
Undervoltage Lockout Reference
VUVLOSEN
V
VUVLO Ramping Down, –40°C ≤ TJ
Voltage
1.345
1.517
125°C
Enabled
5
IUVLO
UVLO Source Current
µA
Enabled, –40°C
≤ TJ ≤ 125°C
3
6
VUVLOSD
UVLO Shutdown Voltage
0.55
0.7
0.82
V
ICOMP
COMP pin Current Sink
VFB = 0V
640
µA
VCOMP
VFB = 1.275V
1
V
RFA = 40 kΩ
475
fnom
Nominal Switching Frequency
kHz
RFA = 40 kΩ, –40°C ≤ TJ ≤ 125°C
406
550
Threshold for Synchronization on
Vsync-HI
Synchronization Voltage Rising
1.4
V
FA/SYNC/SD pin
Threshold for Synchronization on
Vsync-LOW
Synchronization Voltage Falling
0.7
V
FA/SYNC/SD pin
RDS1 (ON)
Driver Switch On Resistance (top)
IDR = 0.2A, VIN= 5 V
4
Ω
RDS2 (ON)
Driver Switch On Resistance (bottom)
IDR = 0.2A
2
Ω
VIN < 6V
VIN
VDR (max)
Maximum Drive Voltage Swing(1)
V
VIN ≥ 6V
6
Dmax
Maximum Duty Cycle
RFA=40 kΩ
81%
85%
250
363
ns
tmin (on)
Minimum On Time
worst case over temperature
571
ns
See(2)
3.7
ISUPPLY
Supply Current (switching)
mA
See(2), –40°C
≤ TJ ≤ 125°C
5.0
(1)
The drive pin voltage, VDR, is equal to the input voltage when input voltage is less than 6 V. VDR is equal to 6 V when the input voltage
is greater than or equal to 6 V.
(2)
For this test, the FA/SYNC/SD Pin is pulled to ground using a 40-k
Ω resistor.
Copyright © 2007–2014, Texas Instruments Incorporated
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