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APW7136ACITRG Datasheet(PDF) 10 Page - Anpec Electronics Coropration

Part # APW7136ACITRG
Description  1MHz, High-Efficiency, Step-Up Converter for 2 to 8 White LEDs
PDF  15 Pages
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Manufacturer  ANPEC [Anpec Electronics Coropration]
Direct Link  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

APW7136ACITRG Datasheet(HTML) 10 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.2 - Jan., 2008
APW7136A/B/C
www.anpec.com.tw
10
Application Information
Input Capacitor Selection
The input capacitor (C
IN) reduces the ripple of the input
current drawn from the input supply and reduces noise
injection into the IC. The reflected ripple voltage will be
smaller when an input capacitor with larger capacitance
is used. For reliable operation, it is recommended to
select the capacitor with maximum voltage rating at least
1.2 times of the maximum input voltage. The capacitors
should be placed close to the VIN and GND.
Inductor Selection
Selecting an inductor with low dc resistance reduces con-
duction losses and achieves high efficiency. The efficiency
is moderated whilst using small chip inductor which op-
erates with higher inductor core losses. Therefore, it is
necessary to take further consideration while choosing
an adequate inductor. Mainly, the inductor value deter-
mines the inductor ripple current: larger inductor value
results in smaller inductor ripple current and lower con-
duction losses of the converter. However, larger inductor
value generates slower load transient response. A rea-
sonable design rule is to set the ripple current,
∆I
L, to be
30% to 50% of the maximum average inductor current,
I
L(AVG). The inductor value can be obtained as below,
where
V
IN = input voltage
V
OUT = output voltage
F
SW = switching frequency in MHz
I
OUT = maximum output current in amp.
η = Efficiency
∆I
L /IL(AVG) = inductor ripple current/average current
(0.3 to 0.5 typical)
To avoid saturation of the inductor, the inductor should be
rated at least for the maximum input current of the con-
verter plus the inductor ripple current. The maximum in-
put current is calculated as below:
η
⋅
⋅
=
IN
OUT
)
MAX
(
OUT
)
MAX
(
IN
V
V
I
I
The peak inductor current is calculated as the following
equation:
(
)
SW
OUT
IN
OUT
IN
)
MAX
(
IN
PEAK
F
L
V
V
V
V
2
1
I
I
⋅
⋅
−
⋅
⋅
+
=
Output Capacitor Selection
The current-mode control scheme of the APW7136 al-
lows the usage of tiny ceramic capacitors. The higher
capacitor value provides good load transients response.
Ceramic capacitors with low ESR values have the lowest
output voltage ripple and are recommended. If required,
tantalum capacitors may be used as well. The output ripple
is the sum of the voltages across the ESR and the ideal
output capacitor.
where I
PEAK is the peak inductor current.
Δ V
OUT = Δ VESR + Δ VCOUT


⋅
−
⋅
≈
∆
SW
OUT
IN
OUT
OUT
OUT
COUT
F
V
V
V
C
I
V
ESR
PEAK
ESR
R
I
V
⋅
≈
∆
V
IN
V
OUT
I
L
N-FET
LX
I
OUT
I
SW
C
IN
C
OUT
I
IN
D1
ESR
I
LIM
I
L
I
PEAK
I
IN
I
OUT
I
SW
I
D
∆I
L
(
)
 ∆
η
×
⋅
−
×


≥
AVG
L
L
)
MAX
(
OUT
SW
IN
OUT
2
OUT
IN
I
I
I
F
V
V
V
V
L



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