Datenblatt-pdf.com


MAP3204SIRH Schematic ( PDF Datasheet ) - MagnaChip

Teilenummer MAP3204SIRH
Beschreibung 4-channel LED Driver
Hersteller MagnaChip
Logo MagnaChip Logo 




Gesamt 11 Seiten
MAP3204SIRH Datasheet, Funktion
Confidential
Preliminary Datasheet Version 0.0
MAP3204
4-channel LED Driver for High Brightness LEDs
General Description
The MAP3204 is a 4-channel LED driver optimized
for LED backlight application targeting mid and large
size LCD module. It uses the boost MOSFET
externally and 4-channel current sources internally for
driving high brightness white LEDs
Input voltage of the MAP3204 is ranged from 7V ~
36V and max. LED current is 150mA per channel. It
can increase the output voltage depending on the
drain voltage rating of boost MOSFET.
It features PWM dimming control, internal soft-start
and 1.5% current matching between channels and
has protections like output over-voltage and LED
short/open and UVLO.
The MAP3204 is available in 16 leads E-TSSOP and
20 leads SOIC package with Halogen-free (fully RoHS
compliant).
Features
7V to 36V Input Voltage Range
Drive up to 4 Channels
150mA Output Current per Channel
1.5% Current Matching
Programmable Boost Switching Frequency :
100kHz to 500kHz
PWM Dimming : up to 22kHz
Current Mode Control
Boost Over Current Protection
Output Over Voltage Protection
LED Short/Open Protection
UVLO
16 leads E-TSSOP and 20 leads SOIC
Applications
High Brightness white LED backlighting for mid
and large size LCD module
General LED lighting applications
Ordering Information
Part Number
MAP3204SIRH
MAP3204TERH
Top
Marking
MAP3204
MAP3204
Ambient
Temperature Range
-40to +85
-40to +85
Typical Application
Package
20 leads SOIC
16 leads TSSOP with E-Pad
RoHS Status
Halogen Free
Halogen Free
Jan. 28th 2011






MAP3204SIRH Datasheet, Funktion
Confidential
Preliminary Datasheet Version 0.0
Application Information
CURRENT MODE BOOST SWITCHING
CONTROLLER OPERATION
The MAP3204 employs current mode control boost
architecture that has a fast current sense loop and a
slow voltage feedback loop. Such architecture
achieves a fast transient response that is essential for
the LED backlight application.
DYNAMIC HEADROOM CONTROL
The MAP3204 features a proprietary Dynamic
Headroom Control circuit that detects the lowest
voltage from any of the FB1-FB4 pins. This lowest
channel voltage is used as the feedback signal for the
boost controller. Since all LED stacks are connected in
parallel to the same output voltage, the other FB pins
will have a higher voltage, but the regulated current
source circuit on each channel will ensure that each
channel has the same current.
INTERNAL 5V/10V REGULATOR
The MAP3204 has built-in 5V LDO regulator to supply
internal analog and logic blocks. The LDO is powered up
when the EN pin is Logic High.
A 10V LDO is used to drive external MOSFET connected
to the GATE pin. A 2.2uF bypass capacitor is required for
stable operation of the LDO.
OVER VOLTAGE PROTECTION
To protect the boost converter when the load is open,
or the output voltage becomes excessive for any
reason, the MAP3204 features a dedicated
overvoltage feedback input. The OVP pin is connected
to the center tap of a resistive voltage-divider from the
high voltage output (see the typical application). When
the OVP pin voltage exceeds 1.25V, a comparator turns off
the external power MOSFET. This switch is re-enabled
after the OVP pin voltage drops 100mV(typical) hysteresis
below the protection threshold. This over voltage
protection feature ensures the boost converter fail-safe
operation when the LED channels are disconnected from
the output.
The OVP level can be calculated with the following
equation.
DIMMING SCHEME
When PWMI signal stays at low level (<0.8V) for a
long time, the MAP3204 turns off the boost circuitry, but
internal circuit is enabled so the MAP3204 increases
the output voltage promptly.
The minimum dimming on duty is 1% at 1kHz = 10us.
PARALLEL OPERATION
Even the MAP3204 has 4Ch and 150mA LED current
capability per channel, 2Ch and 300mA application can
be supported by tying 2FBs into 1ch, so the LED
current capability can be increased to 300mA.
LED OPEN PROTECTION
In case the voltage on LED current sink pins (FB1~4)
are below 0.2V due to LED open, the MAP3204 turns off
the corresponding string and the remaining string(s) will
continue operation. Once the LED open status is
removed, the corresponding string is automatically
recovered.
LED SHORT PROTECTION
If the voltage at any of the FB1-4 pins exceeds a
threshold of approximately 5.5V due to LED short
during normal operation, the MAP3204 turns off the
corresponding string and the remaining string(s) will
continue operation. If all the strings are shorted, the
MAP3204A will be shutdown and latched. The operation
is resumed by a toggling of the EN pin.
VOUT _ OVP = 1.25 × ROVPH + ROVPL
ROVPL
Jan. 28th 2011

6 Page







SeitenGesamt 11 Seiten
PDF Download[ MAP3204SIRH Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
MAP3204SIRH4-channel LED DriverMagnaChip
MagnaChip

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche