ZXSC420E6TA Diodes Zetex, ZXSC420E6TA Datasheet - Page 6

• Manufacturer Part Number: ZXSC420E6TA
• Description: IC CONVERTER BOOST SOT23-6
• Manufacturer: Diodes Zetex
• Type: Step-Up (Boost)r

Specifications of ZXSC420E6TA

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adjustable
• Current - Output: 300mA
• Frequency - Switching: Up to 200kHz
• Voltage - Input: 1.8 ~ 8 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Power - Output: 450mW
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXSC420E6TATR

I
F
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, V
of recommended sense resistors:
Output power calculation
By making the above assumptions for inductance and
peak current the output power can be determined by:
P
where
and
T
and
T
and
T
and
Operating frequency can be derived by:
ZXSC410
ZXSC420
AV
ON
DIS
OUT
OFF
= efficiency i.e. 100% = 1
Cyntec
IRC
T
S E M I C O N D U C T O R S
Manufacture
ON
I
PK
= I
2
I
V
PK
1.7µs (internally set by ZXSC410)
OUT
I
PK
1
V
AV
X
IN
T
x L
(T
OFF
(T
x L
x V
- V
ON
ON
IN
IN
T
T
x
OFF
DIS
= (Watts)
)
)
RL1220
LR1206
Series
SENSE
0.010 - 1.0
0.022 - 10
. Below is a table
R
Range
DC
( )
0805
1206
Size
6
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, I
and ESR. The capacitance value is selected to meet the
load transient requirements. The capacitors I
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.
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
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 I
ESR.
Tolerance
±5%
±5%
http://www.cyntec.com
http://www.ictt.com
URL
ISSUE 2 - May 2003
RMS
RIPPLE
RIPPLE
2
.