IC LED DRIVER WHITE BCKLGT 6-DFN

 

ZXLD1356DACTC

Manufacturer Part NumberZXLD1356DACTC
DescriptionIC LED DRIVER WHITE BCKLGT 6-DFN
ManufacturerDiodes Zetex
TypeBacklight, White LED
ZXLD1356DACTC datasheets

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Specifications of ZXLD1356DACTC

TopologyPWM, Step-Down (Buck)Number Of Outputs1
Internal DriverYesType - PrimaryAutomotive, Backlight
Type - SecondaryHigh Brightness LED (HBLED), White LEDFrequency500kHz
Voltage - Supply6 V ~ 60 VVoltage - Output60V
Mounting TypeSurface MountPackage / Case6-DFN
Operating Temperature-40°C ~ 125°CCurrent - Output / Channel550mA
Internal Switch(s)YesEfficiency97%
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther namesZXLD1356DACTR
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Application Information
(Continued)
Thermal considerations
When operating the device at high ambient temperatures, or when driving maximum load current, care must be taken to avoid
exceeding the package power dissipation limits. The graph below gives details for power derating. This assumes the device to be
2
mounted on a (25mm)
PCB with 1oz copper standing in still air.
2
1.8
1.6
1.4
1.2
1
0.8
TSOT23-5
0.6
0.4
0.2
0
-40
-25
-10
Note that the device power dissipation will most often be a maximum at minimum supply voltage. It will also increase if the
efficiency of the circuit is low. This may result from the use of unsuitable coils, or excessive parasitic output capacitance on the
switch output.
Thermal compensation of output current
High luminance LEDs often need to be supplied with a temperature compensated current in order to maintain stable and reliable
operation at all drive levels. The LEDs are usually mounted remotely from the device so, for this reason, the temperature
coefficients of the internal circuits for the ZXLD1356 have been optimized to minimize the change in output current when no
compensation is employed. If output current compensation is required, it is possible to use an external temperature sensing
network - normally using Negative Temperature Coefficient (NTC) thermistors and/or diodes, mounted very close to the LED(s).
The output of the sensing network can be used to drive the ADJ pin in order to reduce output current with increasing
temperature.
ZXLD1356
Document number: DS33470 Rev. 3 - 2
Maximum Power Dissipation
DFN3030-6
5
20
35
50
65
80
Ambient Temperature (°C)
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A Product Line of
Diodes Incorporated
ZXLD1356
95
110
125
140
December 2010
© Diodes Incorporated

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