ZXLD1356ET5TA Diodes Zetex, ZXLD1356ET5TA Datasheet - Page 22

• Manufacturer Part Number: ZXLD1356ET5TA
• Description: IC LED DRIVR WHITE BCKLGT TSOT-5
• Manufacturer: Diodes Zetex
• Type: Backlight, White LEDr

Specifications of ZXLD1356ET5TA

• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Type - Secondary: High Brightness LED (HBLED), White LED
• Frequency: 500kHz
• Voltage - Supply: 6 V ~ 60 V
• Voltage - Output: 60V
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 550mA
• Internal Switch(s): Yes
• Efficiency: 97%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXLD1356ET5TR

Application Information
Inductor Selection
Recommended inductor values for the ZXLD1356 are in the range 68 µH to 220 µH.
Higher values of inductance are recommended at higher supply voltages in order to minimize errors due to switching delays,
which result in increased ripple and lower efficiency. Higher values of inductance also result in a smaller change in output current
over the supply voltage range. (see graphs pages 10-16). The inductor should be mounted as close to the device as possible
with low resistance connections to the LX and V
The chosen coil should have a saturation current higher than the peak output current and a continuous current rating above the
required mean output current.
Suitable coils for use with the ZXLD1356 may be selected from the MSS range manufactured by Coilcraft, or the NPIS range
manufactured by NIC components. The following websites may be useful in finding suitable components
The inductor value should be chosen to maintain operating duty cycle and switch 'on'/'off' times within the specified limits over
the supply voltage and load current range.
Figures 3 and 4 (following) can be used to select a recommended inductor based on maintaining the ZXLD1356 case
temperature below 60°C for the different package types. For detailed performance characteristics for the inductor values 68, 100,
150 and 220µH see graphs on pages 10-16.
ZXLD1356
Document number: DS33470 Rev. 3 - 2
www.coilcraft.com
www.niccomp.com
www.wuerth-elektronik.de
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1
0
Legend
68uH
100uH
150uH
220uH
10
(Continued)
Figure 3. ZXLD1356 Minimum Recommended Inductor
20
IN
Minimum Recommended Inductor
2% Accuracy, <60°C Case Temperature
pins.
Supply Voltage (V)
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ZXLD1356
December 2010