zxld1362 Zetex Semiconductors plc., zxld1362 Datasheet - Page 27
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zxld1362
Manufacturer Part Number
zxld1362
Description
1a Led Driver With Internal Switch
Manufacturer
Zetex Semiconductors plc.
Datasheet
1.ZXLD1362.pdf
(32 pages)
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Manufacturer
Quantity
Price
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Part Number:
zxld1362ET5TA
Manufacturer:
ZETEX
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Part Number:
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Manufacturer:
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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 ZXLD1362 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.
Issue 1 - December 2007
© Zetex Semiconductors plc 2007
1100
1000
900
800
700
600
500
400
300
200
100
0
-50
-30
-10
Maximum Power Dissipation
10
Ambient Temperature (Deg C)
30
27
50
70
90
110
130
150
ZXLD1362
www.zetex.com