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ZXSC420 Schematic ( Datenblatt PDF ) - Zetex Semiconductors

Teilenummer ZXSC420
Beschreibung VOLTAGE MODE BOOST CONVERTER
Hersteller Zetex Semiconductors
Logo Zetex Semiconductors Logo 



Gesamt 12 Seiten
		
ZXSC420 Datasheet, Funktion
VOLTAGE MODE BOOST CONVERTER
ZXSC410
ZXSC420
DESCRIPTION
The ZXSC410 is voltage mode boost converter in SOT23-6 package. Its excellent
load and line regulation means that for the full supply range from lithium Ion cells,
the output voltage will typically change by less than 1%. Using high efficiency
Zetex switching transistors allow output voltages of tens of volts depending on the
selected transistor. The ZXSC420 includes a battery low indicator. This operates
by indicating when the converter is no longer able to maintain the regulated
output voltage rather than setting a preset threshold, thereby making it suitable for
various battery options and load currents.
FEATURES
1.65V to 8V supply range
Typical output regulation of ±1%
Over 85% typical efficiency
Output currents up to 300mA
4.5A typical shutdown current ZXSC410
End of regulation output ZXSC420
APPLICATIONS
System power for battery portable products
LCD bias
Local voltage conversion
SOT23-6
ORDERING INFORMATION
DEVICE
ZXSC410E6TA
ZXSC420E6TA
REEL TAPE QUANTITY
SIZE WIDTH PER REEL
7” 8mm 3000 units
7” 8mm 3000 units
TYPICAL APPLICATIONS DIAGRAM
VIN
C1
L1
D1
ZHCS1000
VOUT
U1
VCC DRIVE
STDN SENSE
GND VFB
ZXSC410
Q1
FMMT617
R2
C2
R1 R3
DEVICE MARKING
C410 ZXSC410
C420 ZXSC420
ISSUE 2 - May 2003
1 SEMICONDUCTORS






ZXSC420 Datasheet, Funktion
ZXSC410
ZXSC420
Sense Resistor
A low value sense resistor is required to set the peak
current. Power in this resistor is negligible due to the
low sense voltage threshold, VSENSE. Below is a table
of recommended sense resistors:
Manufacture
Cyntec
IRC
Series
RL1220
LR1206
RDC()
Range
0.022 - 10
0.010 - 1.0
Size
0805
1206
Tolerance
URL
±5%
±5%
http://www.cyntec.com
http://www.ictt.com
Output power calculation
By making the above assumptions for inductance and
peak current the output power can be determined by:
POUT = IAV x VIN x = (Watts)
where
IAV =
IPK
2
X (TON+ T DIS)
(TON+ T OFF )
and
TON =
IPK x
VIN
L
Output capacitors
Output capacitors are a critical choice in the overall
performance of the solution. They are required to filter
the output and supply load transient currents. There
are three parameters which are paramount in the
selection of the output capacitors, capacitance, IRIPPLE
and ESR. The capacitance value is selected to meet the
load transient requirements. The capacitors IRIPPLE
rating must meet or exceed the current ripple of the
solution.
The ESR of the output capacitor can also affect loop
stability and transient performance. The capacitors
selected for the solutions, and indicated in the
reference designs, are optimised to provide the best
overall performance.
and
TDIS =
IPK x L
VOUT - VIN
and
Input capacitors
The input capacitor is chosen for its voltage and RMS
current rating. The use of low ESR electrolitic or
tantalum capacitors is recommended. Capacitor
values for optimum performance are suggested in the
reference design section
TOFF 1.7µs (internally set by ZXSC410)
and
Also note that the ESR of the input capcitor is
effectively in series with the input and hence
contributes to efficiency losses in the order of IRMS2 .
ESR.
= efficiency i.e. 100% = 1
Operating frequency can be derived by:
1
F= TON + TOFF
SEMICONDUCTORS
6
ISSUE 2 - May 2003

6 Page







ZXSC420 pdf, datenblatt
ZXSC410
ZXSC420
PACKAGE OUTLINE
PAD LAYOUT DETAILS
A A2
be
L2
E E1
e1 a DATUM A
D
C
A1
CONTROLLING DIMENSIONS IN MILLIMETRES APPROX CONVERSIONS INCHES.
PACKAGE DIMENSIONS
DIM
A
A1
A2
b
C
D
Millimetres
Min Max
0.90 1.45
0.00 0.15
0.90 1.30
0.35 0.50
0.09 0.20
2.80 3.00
Inches
Min Max
DIM
0.35 0.057 E
0 0.006 E1
0.035 0.051 L
0.014 0.019 e
0.0035 0.008 e1
0.110 0.118 L
Millimetres
Min Max
2.60 3.00
1.50 1.75
0.10 0.60
0.95 REF
1.90 REF
0° 10°
Inches
Min Max
0.102 0.118
0.059 0.069
0.004 0.002
0.037 REF
0.074 REF
0° 10°
© Zetex plc 2003
Europe
Zetex plc
Fields New Road
Chadderton
Oldham, OL9 8NP
United Kingdom
Telephone (44) 161 622 4444
Fax: (44) 161 622 4446
hq@zetex.com
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
europe.sales@zetex.com
Americas
Zetex Inc
700 Veterans Memorial Hwy
Hauppauge, NY 11788
USA
Telephone: (1) 631 360 2222
Fax: (1) 631 360 8222
usa.sales@zetex.com
Asia Pacific
Zetex (Asia) Ltd
3701-04 Metroplaza Tower 1
Hing Fong Road
Kwai Fong
Hong Kong
Telephone: (852) 26100 611
Fax: (852) 24250 494
asia.sales@zetex.com
These offices are supported by agents and distributors in major countries world-wide.
This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced
for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company
reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.
For the latest product information, log on to www.zetex.com
ISSUE 2 - May 2003
SEMICONDUCTORS
12

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