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ZXSC410E6TA Datasheet(PDF) 5 Page - Zetex Semiconductors

Part # ZXSC410E6TA
Description  VOLTAGE MODE BOOST CONVERTER
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Manufacturer  ZETEX [Zetex Semiconductors]
Direct Link  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

ZXSC410E6TA Datasheet(HTML) 5 Page - Zetex Semiconductors

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APPLICATIONS INFORMATION
Switching transistor selection
The choice of switching transistor has a major impact
on the converter efficiency. For optimum performance,
a bipolar transistor with low VCE(SAT) and high gain is
required. The VCEO of the switching transistor is also an
important parameter as this sees the full output
voltage when the transistor is switched off. Zetex
SuperSOT™ transistors are an ideal choice for this
application.
Schottky diode selection
As with the switching transistor, the Schottky rectifier
diode has a major impact on the converter efficiency. A
Schottky diode with a low forward voltage and fast
recovery time should be used for this application.
The diode should be selected so that the maximum
forward current rating is greater or equal to the
maximum peak current in the inductor, and the
maximum reverse voltage is greater or equal to the
output voltage. The Zetex ZHCS Series meet these
needs.
Combination devices
To minimise the external component count Zetex
recommends the ZX3CDBS1M832 combination of
NPN transistor and Schottky diode in a 3mm x 2mm
MLP package. This device is recommended for use in
space critical applications.
The IC is also capable of driving MOSFETs. Zetex
recommends the ZXMNS3BM832 combination of low
threshold voltage N-Channel MOSFET and Schottky
diode in a 3mm x 2mm MLP package. This device is
recommended for use in space critical applications.
Inductor Selection
The inductor value must be chosen to satisfy
performance, cost and size requirements of the overall
solution.
Inductor selection has a significant impact on the
converter performance. For applications where
efficiency is critical, an inductor with a series resistance
of 500m
or less should be used.
A list of recommended inductors is listed in the table
below:
Peak current definition
In general, the IPK value must be chosen to ensure that
the switching transistor, Q1, is in full saturation with
maximum output power conditions, assuming
worse-case input voltage and transistor gain under all
operating temperature extremes.
Once IPK is decided the value of RSENSE can be
determined by:
R
SENSE
V
SENSE
I
PK
=
ZXSC410
ZXSC420
SEMICO NDUC TORS
ISSUE 2 - May 2003
5
Pin No.
Name
Description
1VCC
Supply voltage, 1.8V to 8V.
2
GND
Ground
3
STDN/EOR
Shutdown ZXSC410 / End of regulation ZXSC420
4
SENSE
Inductor current sense input. Internal threshold voltage set to
28mV. Connect external sense resistor.
5VFB
Reference voltage. Internal threshold set to 300mV. Connect
external resistor network to set output voltage.
6
DRIVE
Drive output for external switching transistor. Connect to base or
gate of external switching transistor.
Part No.
Manufacture
L
IPK
(A)
RDC
( )
CMD4D11-100MC Sumida
10µH 0.5 0.457
CMD4D11-220MC Sumida
22µH 0.4 0.676
LPO2506OB-103
Coilcraft
10µH 1.0
0.24
ST2006103
Standex
Electronics Inc
10µH 0.6
0.1
PIN DESCRIPTIONS


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