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PDF MAP3511 Data sheet ( Hoja de datos )

Número de pieza MAP3511
Descripción Average Current Control Buck Controller
Fabricantes MagnaChip 
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No Preview Available ! MAP3511 Hoja de datos, Descripción, Manual

Confidential
Datasheet Version 1.0
Datasheet - MAP3511
Average Current Control Buck Controller for LED Backlight
General Description
MAP3511 is an average-mode current control buck
controller for LED backlight application. It does not
require an additional dimming MOSFET and utilizes
constant off-time control and average current control
feedback without external loop compensation or high-
side current sensing.
MAP3511 features ±1% CS voltage accuracy and
has dedicated analog dimming input up to 3V. It can
be powered from 8.5V ~ 18V supply.
MAP3511 provides MOSFET DS short detection(FLT
output), SCP and UVLO.
MAP3511 is available 8 leads SOIC with Halogen-
free (fully RoHS compliant).
Features
8.5V to 18V Input Voltage Range
Average-Mode Current Control
Programmable Constant off-time
Up to 3V Analog Dimming Input
1% CS Voltage Accuracy
Direct PWM Dimming Input
Fault Output(MOSFET Drain-Source Short)
Short Circuit Protection
UVLO
8 Leads SOIC Package with Halogen-free
Applications
High Brightness white LED backlighting for LCD
TVs
General LED lighting applications
Ordering Information
Part Number
MAP3511SIRH
Top
Marking
MAP3511
Ambient
Temperature Range
-40to +85
1 Typical Application
Package
8Leads SOIC
RoHS Status
Halogen Free
VIN
VCC
PWM
ADIM
CIN
CVCC
MAP3511
2
VCC
FLT 7
RPWM
RADIM
CADIM
6
PWM
8 ADIM
GATE 4
CS 1
RTOFF
5
TOFF
GND 3
D
FLT
RG Q
RF
CF RCS
COUT
L
LEDs
Dec 12th 2014

1 page




MAP3511 pdf
Confidential
Typical Operating Characteristics
Unless otherwise noted, VVCC = 12V and TA = 25C.
Datasheet Version 1.0
5
Set ILED=425mA
Set ILED=425mA
Dec 12th 2014
Set ILED=425mA

5 Page





MAP3511 arduino
Confidential
Datasheet Version 1.0
External Components Selection
Inductor
In order to achieve accurate constant current output,
the MAP3511 is required to operate in Continuous
Conduction Mode (CCM) under all operating conditions.
In general, the magnitude of the inductor ripple current
should be kept as small as possible. If the PCB size is
not limited, higher inductance values result in better
accuracy of the output current. However, in order to
minimize the physical size of the circuit, an inductor
with minimum physical outline should be selected such
that the converter always operates in CCM and the
peak inductor current does not exceed the saturation
current limit of the inductor.
The Min. inductance(boundary inductance) which
guarantees CCM operation can be calculated as;
I LB 2 I OUT
L MIN
V
OUT
I LB
t OFF
V (1 D )
OUT
2 I OUT f SW
The ripple current through chosen inductor is as
following equation;
MOSFET
The power MOSFET is chosen based on maximum
stress voltage, maximum peak MOSFET current, total
power losses, maximum allowed operating temperature
and the driver capability of the MAP3511.
Maximum stress voltage on the power MOSFET
(drain-source voltage) for this buck converter is equal
to the input voltage. The power MOSFET must be
selected with some voltage margin. For example, if the
input voltage is maximally 400 V, then maximum drain-
source voltage should be 450 V or higher.
Maximum peak MOSFET current was selected in
order to calculate the inductor size. Also in this case,
the power MOSFET must be chosen with some current
margin.
The power losses in the MOSFET can be separated
into conduction losses and switching losses. The
conduction loss, PCOND, is the I2R loss across the
MOSFET. The conduction loss is given by;
PCOND R DS ( ON ) I RMS 2 k
11
I L
(V IN
V OUT
Lf
)D
SW
For example, in case VIN=175V, VOUT=135V,
IOUT(ILED)=425mA, fSW=50kHz and target ripple
current=300mA;
V
D OUT
135
0 .77
V IN 175
L
V OUT
(1 D )
135 (1 0 .77 )
0 .73 [ mH ]
MIN 2 I OUT f SW 2 0 .425 50 10 3
The ripple current at LMIN is 2*IOUT=850[mA] and this is
too large to use.
For target ripple current(ΔIL=300mA);
L (V IN
V OUT
)D
(175
135 ) 0 .77
2 .05 [ mH
]
I L f SW
0 .3 50 10 3
Where, k is the temperature coefficient of the MOSFET.
The switching loss is related to QGD and QGS1 which
determine the commutation time. QGS1 is the charge
between the threshold voltage and the plateau voltage
when a driver charges the gate, which can be read in
the chart of VGS vs. QG of the MOSFET datasheet. QGD
is the charge during the plateau voltage. These two
parameters are needed to estimate the turn on and turn
off loss.
PSW Q GS 1 R G V DS I IN f SW
V DR V TH
Q GD R G
V DR V PLT
V DS I IN f SW
where VTH is the threshold voltage, VPLT is the plateau
voltage, RG is the gate resistance, VDS is the drain-
source voltage, VDR is the drive voltage
The total gate charge, QG, is used to calculate the
gate drive loss. The expression is
In this case, the chosen conventional inductor is
2mH/1A.
P DR Q G V DR f SW
Fast switching MOSFETs can cause noise spikes
which may affect performance. To reduce these spikes
a drive resistor can be placed between GATE pin and
the MOSFET gate.
Dec 12th 2014

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