ZXLD1366EN8TC Diodes Inc, ZXLD1366EN8TC Datasheet - Page 21

• Manufacturer Part Number: ZXLD1366EN8TC
• Description: Current & Power Monitors & Regulators LED DRVR W/ INT SW 1A 60V
• Manufacturer: Diodes Inc

Specifications of ZXLD1366EN8TC

• Product: Current Monitors
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: SMD/SMT
• Sense Voltage (max): 0.3 V
• Supply Voltage (max): 60 V
• Supply Voltage (min): 6 V
• Package / Case: SO-8-EP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
V
V
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 used with the C
ceramic capacitor 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:
Inductor selection
Recommended inductor values for the ZXLD1366 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- 17). The inductor should be mounted as close to the device as
possible with low resistance connections to the LX and VIN pins.
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 ZXLD1366 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.
The graph Figure 3 below can be used to select a recommended inductor based on maintaining the ZXLD1366 case
temperature below 60°C. For detailed performance characteristics for the inductor values 68, 100, 150 and 220μH see
graphs on pages 10-17.
ZXLD1366
Document number: DS31992 Rev. 6 - 2
IN
IN
IN
IN
capacitor selection
= 6 to 40V C
= 40 to 50V C
= 50 to 60V C
www.murata.com
www.niccomp.com
www.kemet.com
www.coilcraft.com
www.niccomp.com
www.wuerth-elektronik.de
IN
IN
IN
= 2.2μF
= 4.7μF
= 10μF
(Continued)
IN
= 10μF, an electrolytic capacitor can be used provided that a suitable 1µF
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21 of 30
IN
pin as possible.
IN
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A Product Line of
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© Diodes Incorporated
ZXLD1366
March 2011