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A Product Line of
Diodes Incorporated
ZXLD1350
30V 350mA LED DRIVER with AEC-Q100
Application Information (Continued)
Example:
For V IN =12V, L=47μH, rL=0.64V, V LED =3.4V, I avg =350mA and V D =0.36V
t ON = (47e-6 x 0.105)/(12 - 3.4 - 0.672) = 0.622μs
t OFF = (47e-6 x 0.105)/(3.4 + 0.36 + 0.322)= 1.21μs
This gives an operating frequency of 546kHz and a duty cycle of 0.34.
These and other equations are available as a spreadsheet calculator from the Diodes website.
Note that in practice, the duty cycle and operating frequency will deviate from the calculated values due to dynamic switching
delays, switch rise/fall times and losses in the external components.
Optimum performance will be achieved by setting the duty cycle close to 0.5 at the nominal supply voltage. This helps to
equalize the undershoot and overshoot and improves temperature stability of the output current.
Diode Selection
For maximum efficiency and performance, the rectifier (D1) should be a fast low capacitance Schottky diode with low reverse
leakage at the maximum operating voltage and temperature. The recommended diode for use with this part is the ZLLS1000.
This has approximately ten times lower leakage than standard Schottky diodes, which are unsuitable for use above 85°C. It
also provides better efficiency than silicon diodes, due to a combination of lower forward voltage and reduced recovery time.
The table below gives the typical characteristics for the ZLLS1000:
Diode
ZLLS1000
Forward Voltage
@ 100mA (mV)
310
Continuous
Current
(mA)
1000
Reverse Leakage
@ 30V 85°C
(mA)
300
Package
TSOT23
If alternative diodes are used, it is important to select parts with a peak current rating above the peak coil current and a
continuous current rating higher than the maximum output load current. It is very important to consider the reverse leakage of
the diode when operating above 85°C. Excess leakage will increase the power dissipation in the device.
The higher forward voltage and overshoot due to reverse recovery time in silicon diodes will increase the peak voltage on the
LX output. If a silicon diode is used, care should be taken to ensure that the total voltage appearing on the LX pin including
supply ripple, does not exceed the specified maximum value.
Reducing Output Ripple
Peak to peak ripple current in the LED(s) can be reduced, if required, by shunting a capacitor Cled across the LED(s) as
shown below:
V IN
R S
D1
LED
L1
Cled
ZXLD1350
Document number: DS33468 Rev. 8 - 2
V IN
I SENSE
ZXLD1350
18 of 22
www.diodes.com
LX
March 2011
? Diodes Incorporated
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