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MP3306 Datasheet(PDF) 8 Page - Monolithic Power Systems

Part # MP3306
Description  30V, 700kHz Synchronous Step-Up White LED Driver
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP3306 Datasheet(HTML) 8 Page - Monolithic Power Systems

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MP3306-
--
-30V 700kHz SYNCHRONOUS STEP-UP WHITE LED DRIVER
MP3306 Rev.1.0
www.MonolithicPower.com
8
3/6/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
APPLICATION INFORMATION
VIN
EN
DIM
GND
LED+
LED-
TP6
TP5
TP4
TP3
TP2
TP1
U1
MP3306
L
1
2
3
4
5
6
8
7
10
11
9
12
SW
BS T
OU T
IN
VCC
EN
PWMI
PWMO
OV P
GND
FB
JP1
C6
10nF
R1
51k
R5
0
R3
51k
R8
205k
R9
10k
C5
NS
R7
NS
R2
0
R4
NS
Figure 2—3V~12V Input, Typical Application Driving 8 WLEDs in series
Figure 2 shows a typical application circuit that
can drive up to 8 white LEDs with 20mA. A
0.22~2.2 F output capacitor is sufficient for most
applications. The inductor with low DC inductor
resistance (DCR) will improve efficiency. Two
4.7µF ceramic capacitors provide sufficient input
decoupling.
Selecting the Inductor
The inductor forces a higher output voltage
driven from a lower input voltage. A larger
inductor value results in less ripple current, a
lower peak inductor current, and reduces stress
on the internal N-Channel MOSFET. However,
larger-value
inductor has
a
larger
physical
footprint, higher series resistance, and lower
saturation current.
Choose an inductor that does not saturate under
the worst-case load conditions. Calculate the
required inductance value using the following
equations:
2
OUT
SW
LOAD
η V
D (1 D)
L
2
f
I
×
×
× −
×
×
IN
OUT
V
D
1
V
= −
Where VIN and VOUT are the input and output
voltages, fSW is the switching frequency, ILOAD is
the LED load current, and η is the efficiency.
Setting the LED Current
The LED current is controlled by the current
setting resistor, R1. The current through the
LEDs is given by: ILED = 202mV/R1.
Table 1 shows the selection of resistors for a
given LED current.
Table 1—ILED vs. R1 RSET
ILED (mA)
R1 ( )
1
200
5
40
10
20
20
10
60
3.33
180
1.11
200
1
The
internal
ramped
compensation
voltage
added to the current sense amplifier reduces the
maximum output current as the duty cycle
increases. As more LEDs are added, the output
voltage rises but the maximum current delivered
to the load falls as well. Figure 3 shows the
current limit curve, and the max LED current is
gotten as the formula.
IN
LOAD(max)
PK
SW
V
D
I
(I
) (1 D) 0.8
2 L f
×
=
×
×
× ×
Where, IPK is the peak current corresponding duty
cycle from current limit curve, the L is inductor,
the
0.8
means
the
margin
coefficient.


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