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PDF MAP3249 Data sheet ( Hoja de datos )
| Número de pieza | MAP3249 | |
| Descripción | 4-channel LED Driver | |
| Fabricantes | MagnaChip | |
| Logotipo |  |
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Confidential
Datasheet Version 1.2
Datasheet - MAP3249
4-channel LED Driver for High Brightness LEDs
General Description
MAP3249 is a 4-channel LED driver optimized for
LED backlight application targeting mid and large size
LCD module. MAP3249 uses the boost MOSFET
externally and 4-channel current sources internally for
driving high brightness White LEDs.
MAP3249 has 55V absolute Max. rating FB pins and
input voltage is ranged from 8.5V ~ 28V and max LED
current is 200mA per channel.
MAP3249 features internal soft-start and ±2.5%
LED current accuracy including matching between
channels.
MAP3249 has various protections like output over-
voltage, LED short/open, open schottky diode, UVLO
and thermal shutdown.
MAP3249 has an unused channel detection function
to not boost the output voltage to OVP at start-up.
MAP3249 is available 16 leads SOIC and E-TSSOP
with Halogen-free (fully RoHS compliant).
Features
8.5V to 28V Input Voltage Range
Drive up to 4 Channels
55V FB Pin Voltage
0.4V Headroom Voltage
200mA Output Current per Channel
±2.5% Current Accuracy
Programmable Boost Switching Frequency
(100KHz ~ 500KHz)
LED Current Set by both
PWM and External DC Voltage
Unused Channel Detection
Boost Over Current Protection
Output Over Voltage Protection
LED Short / Open Protection
Schottky Diode Open Protection
UVLO
Applications
High Brightness white LED backlighting for LCD
TVs and monitors
General LED lighting applications
1 Ordering Information
Part Number
MAP3249SIRH
MAP3249TERH
Top
Marking
MAP3249
MAP3249
Typical Application
Ambient
Temperature Range
-40℃ to +85℃
-40℃ to +85℃
Package
16Leads SOIC
16Leads E-TSSOP
RoHS Status
Halogen Free
Halogen Free
Oct 8th 2014
1 page  
Confidential
Electrical Characteristics
Unless noted, VVIN = 12V, CVIN = 1.0µF, and typical values are tested at TA = 25°C.
Parameter
Test Condition
General Input Output
VVIN Input Voltage Range
IQ Quiescent Current
Driving FBs at Min. setting with no load
ISD
Ground Pin Current in
Shutdown
VVIN = 12V, VEN = 0V
No Load Current on FB
VEN
REN
VUVLO
Logic Input Level on
EN pin
Pull-down resistor on EN pin
Under Voltage Lockout
Threshold Voltage on VIN pin
VEN_L : Logic Low
VEN_H : Logic High
Stop threshold
Start threshold
Oscillator
fSW
Dmax
Reference
VVLDO
Protection
Internal Oscillator
Frequency
Max. Duty Cycle
LDO Voltage
RFSW=250 kΩ
RFSW=100 kΩ
VVIN ≥ 8.5V, 0mA ≤ ILDO ≤ 10mA
TSD
Thermal Shutdown
Temperature
VOVP
Over-Voltage Threshold
on OVP pin
VLED_SHORT
LED Short Protection
Threshold on FB pins
tSCP LED Short Protection Time
5
VCS
Boost Over Current Protection
Threshold on CS pin
VOPEN
LED Open Protection
Threshold on FB pins
VSBDOPEN
SBD Open Protection
Threshold on OVP pin
LED Current Sink Regulator
Shutdown Temperature
Hysteresis, ΔTSD
Rising Over-Voltage Limit on OVP pin
Hysteresis, ΔVOVP
FB1 ~ FB4
fSW=500kHz (Note 1, 2)
ILED=90mA
ILED=200mA
VFB1~4
Min. FB1~FB4 Voltage
IFB Current Accuracy
IFB_max
Current Sink Max. Current
IFB_leakage Current Sink Leakage Current
VADIM
ADIM Input Voltage Range
PWM Interface
ILED=120mA
VADIM=2.0V
VPWM=0V, VFB=30V
fPWM PWM Dimming Frequency
VPWM
Logic Input Level on
PWM pin
tON_MIN
Min. On-Time (Note 1)
RPWM
Pull-down Resistor on PWM pin
Boost MOSFET GATE Driver
VGATE
ISOURCE
ISINK
tRISE
tFALL
Soft Start
GATE Drive Voltage
GATE Source Current
GATE Sink Current
GATE Output Rising Time
GATE Output Falling Time
VPWM_L : Logic Low
VPWM_H : Logic High
fSW=200kHz
VVIN ≥ 8.5V
VVIN ≥ 8.5, VGATE = 0.9* VVLDO
VVIN ≥ 8.5V, VGATE = 0.1* VVLDO
GATE load : 10Ω / 1nF
GATE load : 10Ω / 1nF
tSS Soft Start Time
fSW=200kHz (Note 1)
Note 1: These parameters, although guaranteed by design, are not tested in mass production.
Note 2: tscp = 1 × 4096
fsw
Datasheet Version 1.2
Min Typ Max
8.5 28
4 10
40
0.8
2.2
250 500
6.5 7.0
7.5 8.2
180 200 220
425 500 575
85 90
4.95 5.2 5.45
150
25
2.35 2.5 2.65
0.1
8.5
8.192
0.57 0.6 0.63
0.09
0.2
0.1
0.4
-2.5 +2.5
200
5
0.9 2.0
0.1 2.0
0.8
2.2
7
250 500
4.95 5.2 5.45
35
30
0.1 0.5
0.1 0.5
8.5 13.0
Unit
V
mA
µA
V
kΩ
V
kHz
%
V
°C
V
V
ms
V
V
V
V
%
mA
uA
V
kHz
V
us
kΩ
V
mA
mA
us
us
ms
Oct 8th 2014
5 Page 
Confidential
Datasheet Version 1.2
START-UP
UNDER VOLTAGE LOCKOUT
(1) The MAP3249 has soft-start circuitry internally
and the soft-start time(tss) is typical 8.5ms.
(2) ‘Unused Channel Detection Function’
There can be exist applications which do not use
all the FB pins(4 channel). Conventional multi-
channel LED drivers boost the output voltage to
OVP level to check open FB(s).
The MAP3249 detects unused FB(s) and
excludes corresponding FB(s) automatically from
headroom control before start-up. The unused
FB(s) must be connected to GND. This ensures
the output voltage is not boosted to OVP level at
start-up. If the unused FB(s) are not connected to
GND, the output voltage is boosted up to OVP level
like conventional boost LED driver.
If the input voltage falls below the UVLO level of
typical 6.5V on the VIN pin, the device will stop
switching and be reset. Operation will restart when the
VIN pin voltage rises to 7.5V. This ensures fail-safe
operation when the input voltage falls below Min. VIN
voltage of IC.
SBD OPEN PROTECTION
When OVP pin voltage is less than 0.1V, the
MAP3249 turns off the GATE output.
This protects the driver from damage if the output
schottky diode is open(defective or poor solder contact).
These features significantly reduce the start-up
current and prevent abnormal operation at start-up.
OUTPUT OVER VOLTAGE PROTECTION
To protect the boost converter when the load is open
or the output voltage becomes excessive for any
reason, the MAP3249 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. When the OVP pin voltage exceeds typical 2.5V, a
11 comparator turns off the external power MOSFET. This
switch is re-enabled after the OVP pin voltage drops typical
100mV 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.
A 5V zener diode is recommendable to avoid pin
damage when the RVOPL resistor is open abnormally.
The OVP voltage of output voltage can be calculated by
following equation.
VOUT
_ OVP[V ]
=
2.5 × (1 +
ROVPH
ROVPL
)
Oct 8th 2014
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAP3249.PDF ] | |
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