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LM3492Q Scheda tecnica(PDF) 3 Page - Texas Instruments

Il numero della parte LM3492Q
Spiegazioni elettronici  Two-Channel Individual Dimmable LED Driver
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LM3492, LM3492Q
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SNVS656C – SEPTEMBER 2010 – REVISED MAY 2013
PIN DESCRIPTIONS (continued)
Pin
Name
Description
Application Information
14
LGND
Ground of the Current Regulator
Current regulator ground. Must be connected to the GND pin for normal
operation. The LGND and GND pins are not internally connected.
15
DIM1/CLK
Dimming Control of Channel 1
Control the on/off of the current regulator of channel 1. This pin is internally
pulled low by a 5 µA current. This pin also serves as a clock signal for
latching input/output data of the COMM pin.
16
DIM2
Dimming Control of Channel 2
Control the on/off of the current regulator of channel 2. This pin is internally
pulled low by a 5 µA current.
17, 18
PGND
Power Ground
Integrated MOSFET ground. Must be connected to the GND pin for normal
operation. The PGND and GND pins are not internally connected.
19
VCC
LDO Regulator Output
Nominally regulated to 5.5V. Connect a capacitor of larger than 0.47 µF
between the VCC and GND pins.
20
ILIM
Peak Current Limit Adjust
Connect an external resistor from the ILIM pin to the VCC pin reduces
peak current limit. Connect the ILIM pin to the ground to obtain the
maximum current limit.
DAP
DAP
Exposed Pad
Thermal connection pad. Connect to a ground plane.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS
(1)
VALUE / UNITS
VIN, RT, VOUT to GND
−0.3V to 67V
SW to GND
−0.3V to 67V
SW to GND (Transient)
−2V (<100 ns)
ILIM to GND
−0.3V to 0.3V
FB to GND
−0.3V to 5V
COMM, DIM1, DIM2, to GND
−0.3V to 6V
ESD Rating, Human Body Model (2)
±2kV
Storage Temperature Range
−65°C to +150°C
Junction Temperature (TJ)
150°C
(1)
Absolute Maximum Ratings are limits which damage to the device may occur. Operating ratings are conditions under which operation of
the device is intended to be functional. For specifications and test conditions, see the electrical characteristics. Thermal shutdown might
occur within ambient operating temperature range as junction temperature rises above TSD level, customer should refer to efficiency
data and thermal resistance data to estimate the junction temperature to ambient temperature delta.
(2)
The human body model is a 100 pF capacitor discharged through a 1.5 k
Ω resistor into each pin.
RECOMMENDED OPERATING CONDITIONS
(1)
Supply Voltage (VIN)
4.5V to 65V
Operation Temperature Range (TA)
−40°C to +125°C
Thermal Resistance (
θJA)
(2)
32.7°C/W
(1)
Absolute Maximum Ratings are limits which damage to the device may occur. Operating ratings are conditions under which operation of
the device is intended to be functional. For specifications and test conditions, see the electrical characteristics. Thermal shutdown might
occur within ambient operating temperature range as junction temperature rises above TSD level, customer should refer to efficiency
data and thermal resistance data to estimate the junction temperature to ambient temperature delta.
(2)
The
θJA is measured on a 4-layer standard JEDEC thermal test board with 12 vias, no air flow and 1W power dissipation. Thermal
shutdown will occur if the junction temperature exceeds 165°C. The maximum power dissipation is a function of TJ(MAX), θJA and TA. The
maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) – TA) /θJA.
Copyright © 2010–2013, Texas Instruments Incorporated
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