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AN44 Datasheet(PDF) 4 Page - Zetex Semiconductors

Part No. AN44
Description  A high power LED driver for low voltage halogen replacement
Download  6 Pages
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Maker  ZETEX [Zetex Semiconductors]
Homepage  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

AN44 Datasheet(HTML) 4 Page - Zetex Semiconductors

  AN44 Datasheet HTML 1Page - Zetex Semiconductors AN44 Datasheet HTML 2Page - Zetex Semiconductors AN44 Datasheet HTML 3Page - Zetex Semiconductors AN44 Datasheet HTML 4Page - Zetex Semiconductors AN44 Datasheet HTML 5Page - Zetex Semiconductors AN44 Datasheet HTML 6Page - Zetex Semiconductors  
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AN44
www.zetex.com
4
Issue 2 - July 2006
© Zetex Semiconductors plc 2006
As the TOFF period is nominally 1.7µs, the current should have time to reach zero. However, 1.5µs
is rather close to 1.7µs and it is possible that, over component tolerances, the coil current will not
reach zero, but this is not a big issue as the remaining current will be small. Note that, because of
the peak current measurement and switch-off, it is not possible to get the dangerous ‘inductor
staircasing’ which occurs in converters with fixed TON times. The current can never exceed IPEAK,
so even if it starts from a finite value (i.e. continuous mode) it will not exceed the IPEAK. The LED
current will therefore be approximately the average of 680mA and zero = 340mA (it will not be
exactly the average, because there is a 200ns period at zero current, but this is small compared
with the IPEAK and component tolerances).
Ref
Value
Part number
Manufacturer Contact details
Comments
U1
ZXSC310E5
Zetex
www.zetex.com
LED Driver in SOT23-5
Q1
ZXMN6A07F
Zetex
www.zetex.com
N-channel MOSFET in
SOT23
D1
1A / 40V
ZHCS1000
Zetex
www.zetex.com
1A Schottky diode in
SOT23
D2
6V8
Generic
Generic
6V8 Zener diode
L1
22 H
DO3316P-223 Coilcraft
www.coilcraft.com
R1
50m
Generic
Generic
0805 size
R2
1k2
Generic
Generic
0805 size
C1
100 F/25V
Generic
Generic
C2
1 F/10V
Generic
Generic
C3
2.2 F/25V
Generic
Generic
Table 1
Bill of materials


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