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LM27951SD Arkusz danych(PDF) 4 Page - Texas Instruments

Numer części LM27951SD
Szczegółowy opis  White LED Adaptive 1.5/1 Switched-Capacitor Current Driver
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LM27951
SNVS416C – NOVEMBER 2005 – REVISED FEBRUARY 2016
www.ti.com
Product Folder Links: LM27951
Submit Documentation Feedback
Copyright © 2005–2016, Texas Instruments Incorporated
(1)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2)
If Military/Aerospace specified devices are required, contact the Texas Instruments Sales Office / Distributors for availability and
specifications.
(3)
Maximum value is 6 V.
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
(1) (2)
MIN
MAX
UNIT
VIN
–0.3
6
V
EN, PWM
–0.3
VIN + 0.3
(3)
V
Continuous power dissipation
Internally limited
Junction temperature, TJ-MAX-ABS
150
°C
Lead temperature (Soldering, 5 sec.)
260
°C
Storage temperature, Tstg
–65
150
°C
(1)
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
6.2 ESD Ratings
VALUE
UNIT
V(ESD)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)
±2000
V
(1)
All voltages are with respect to the potential at the GND pin.
(2)
Minimum and maximum limits are ensured by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the
most likely norm.
(3)
In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may
have to be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operation junction temperature (TJ-MAX-OP =
115°C), the maximum power dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the
part/package in the application (RθJA), as given by the equation: TA-MAX = TJ-MAX-OP – (RθJA × PD-MAX).
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
(1) (2) (3)
MIN
NOM
MAX
UNIT
Inpu voltage, VIN
2.8
5.5
V
LED voltage
2.5
3.9
V
Junction temperature, TJ
–40
115
°C
Ambient temperature, TA
–40
85
°C
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
6.4 Thermal Information
THERMAL METRIC(1)
LM27951
UNIT
NHK (WSON)
14 PINS
RθJA
Junction-to-ambient thermal resistance
42.5
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
33.3
°C/W
RθJB
Junction-to-board thermal resistance
14.1
°C/W
ψJT
Junction-to-top characterization parameter
0.5
°C/W
ψJB
Junction-to-board characterization parameter
14.1
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
6.1
°C/W


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