ZXLD1356ET5TA Diodes Zetex, ZXLD1356ET5TA Datasheet - Page 21

• 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
V
A low ESR capacitor should be used for input decoupling, as the ESR of this capacitor appears in series with the supply source
impedance and lowers overall efficiency. This capacitor has to supply the relatively high peak current to the coil and smooth the
current ripple on the input supply.
To avoid transients into the IC, the size of the input capacitor will depend on the V
When the input voltage is close to the output voltage the input current increases which puts more demand on the input capacitor.
The minimum value of 2.2µF may need to be increased to 4.7µF; higher values will improve performance at lower input voltages,
especially when the source impedance is high. The input capacitor should be placed as close as possible to the IC.
For maximum stability over temperature and voltage, capacitors with X7R, X5R, or better dielectric is recommended. Capacitors
with Y5V dielectric are not suitable for decoupling in this application and should NOT be used.
When higher voltages are with C
is also used and positioned as close to the V
A suitable capacitor would be NACEW100M1006.3x8TR13F (NIC Components).
The following web sites are useful when finding alternatives:
ZXLD1356
Document number: DS33470 Rev. 3 - 2
IN
Capacitor Selection
V
V
V
www.murata.com
www.niccomp.com
www.kemet.com
IN
IN
IN
= 6 to 40V
= 40 to 50V
= 50 to 60V
C
C
C
IN
IN
IN
= 2.2µF
= 4.7µF
= 10µF
IN
(Continued)
= 10µF, an electrolytic capacitor can be used provided that a suitable 1mF ceramic capacitor
IN
pin as possible.
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ZXLD1356
December 2010