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AN44 Arkusz danych(PDF) 3 Page - Zetex Semiconductors

Numer części AN44
Szczegółowy opis  A high power LED driver for low voltage halogen replacement
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Producent  ZETEX [Zetex Semiconductors]
Strona internetowa  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

AN44 Arkusz danych(HTML) 3 Page - Zetex Semiconductors

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AN44
Issue 2 - July 2006
3
www.zetex.com
© Zetex Semiconductors plc 2006
For continuous mode
If the current does not reach zero after 1.7µs, but instead falls to a value of IMIN, then the device
is said to be in ‘continuous’ mode. The LED current will ramp up and down between IMIN and IPEAK
(probably at different di/dt rates) and the average LED current will therefore be the average of
IPEAK and IMIN, as shown in Figure 3.
Figure 3
Design example
(Refer to Figure 1 and Table 1)
Input = VIN = 12V
LED forward drop = VLED = 9.6V
VIN = VLED+VL
Therefore VL = (12 - 9.6) = 2.4
The peak current = VSENSE / R1
(R1 is RSENSE) = 24mV/50mR = 480mA
TON = IPEAK x L1/V(L1)
These equations make the approximation that the LED forward drop is constant throughout the
current ramp. In fact it will increase with current, but they still enable design calculations to be
made within the tolerances of the components used in a practical circuit. Also, the difference
between VIN and VLED is small compared to either of them, so the 6.2µs ramp time will be fairly
dependent on these voltages.
Note that, for an LED drop of 9.6V and a Schottky drop of 300mV, the time to ramp down from
680mA to zero would be:
T
ON
680mAx22
µH
2.4
---------------------------------------
6.2
µs
=
TDIS
680mAx22
µH
9.6
0.3
+
()
---------------------------------------
1.5
µs
=


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