ZXLD1366_10 DIODES [Diodes Incorporated], ZXLD1366_10 Datasheet - Page 21

• Manufacturer Part Number: ZXLD1366_10
• Description: HIGH ACCURACY 1A, 60V LED DRIVER WITH INTERNAL SWITCH
• Manufacturer: DIODES [Diodes Incorporated]

VIN capacitor selection
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:
www.murata.com
www.niccomp.com
www.kemet.com
ZXLD1366
Document number: DS31992 Rev. 5 - 2
IN
IN
IN
= 6 to 40V C
= 40 to 50V C
= 50 to 60V C
IN
IN
IN
= 2.2μF
= 4.7μF
= 10μF
IN
= 10μF, an electrolytic capacitor can be used provided that a suitable 1mF
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IN
pin as possible.
IN
Diodes Incorporated
A Product Line of
voltage:
© Diodes Incorporated
ZXLD1366
June 2010