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PDF MAP3242 Data sheet ( Hoja de datos )
| Número de pieza | MAP3242 | |
| Descripción | 4-channel LED Driver | |
| Fabricantes | MagnaChip | |
| Logotipo |  |
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Confidential
Datasheet Version 1.1
Datasheet - MAP3242
4-channel LED Driver for High Brightness LEDs
General Description
Features
MAP3242 is a 4-channel LED driver optimized for
8.5V to 36V Input Voltage Range
LED backlight application targeting mid and large size
Drive up to 4 Channels
LCD module. MAP3242 uses the boost MOSFET
65V FB Pin Voltage
externally and 4-channel current sources internally for
0.8V Min Headroom Voltage @ 150mA
driving high brightness White LEDs.
240mA Output Current per Channel
MAP3242 has 65V absolute Max. rating FB pins and
±2.5% Current Accuracy
input voltage is ranged from 8.5V ~ 36V and max LED
Initial Open FB Detection Function
current is 240mA per channel.
Programmable Boost Switching Frequency
MAP3242 features internal soft-start and 2.5% LED
(100KHz ~ 500KHz)
current accuracy including matching between
LED Current Set by both
channels
PWM and External DC Voltage
MAP3242 has various protections like output over-
Boost Over Current Protection
voltage, adjustable LED short, LED open, open
Output Over Voltage Protection
schottky diode and UVLO.
Adjustable LED Short Protection
MAP3242 has initial open FB detection function to
LED Open Protection
not boost the output voltage to OVP level except LED
Schottky Diode Open Protection
open event.
UVLO
MAP3242 is available 28 leads HSOP, 20 leads SOIC
and E-TSSOP with Halogen-free (fully RoHS
compliant).
Applications
High Brightness white LED backlighting for LCD
TVs and monitors
1 General LED lighting applications
Ordering Information
Part Number
MAP3242SHRH
MAP3242SIRH
MAP3242TERH
Top
Marking
MAP3242
MAP3242
MAP3242
Typical Application
Ambient
Temperature Range
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
Package
28Leads HSOP
20Leads SOIC
20Leads E-TSSOP
RoHS Status
Halogen Free
Halogen Free
Halogen Free
Jun 13th 2013
1 page  
Confidential
Electrical Characteristics
Unless noted, VIN = 12V, CIN = 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
VIN = 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 VDD pin
VEN_L : Logic Low
VEN_H : Logic High
Release UVLO
Hysteresis
Oscillator
fSW
Dmax
Reference
Internal Oscillator
Frequency
Max. Duty Cycle
RFSW=250 kΩ
RFSW=100 kΩ
VVLDO
IVLDO
VVDD
Protection
5V LDO Voltage
5V LDO Source Current
LDO Voltage for Gate Driver
VIN > 15V, No load current
VIN > 15V, No load current
VIN > 15V, No load current
TSD
Thermal Shutdown
Temperature
VOVP
Over-Voltage Threshold
on OVP pin
5
VLED_SHORT
LED Short Protection
Threshold on FB pins
tSCP LED Short Protection Time
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
VVLS=1V
VVLS=3V
fSW=500kHz (Note 1, 2)
ILED=90mA
ILED=240mA
(Note 1)
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
RADIM
Pull-down Resistor on ADIM pin
PWM Interface
ILED=150mA, VADIM=1.5V
ILED=120mA, VADIM=1.2V
VADIM=2.4V
VPWM=0V
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
VPWM_L : Logic Low
VPWM_H : Logic High
fSW=100kHz
VGATE
ISOURCE
ISINK
tRISE
tFALL
Gate Drive Voltage
Gate Source Current
Gate Sink Current
Gate Output Rising Time
Gate Output Falling Time
VIN > 15V
VIN > 15V, VGATE = 0.9* VVDD
VIN > 15V, VGATE = 0.1* VVDD
Gate load : 10Ω / 1nF
Gate load : 10Ω / 1nF
Datasheet Version 1.1
Min Typ Max
8.5 36
5 10
40
0.8
2.2
250 500
7.0 7.5
1.0
180 200 220
425 500 575
85 90
4.75 5 5.25
10
8.5 10 11.5
2.35
150
25
2.5
0.1
5
15
8.192
2.65
0.57 0.6 0.63
0.09
0.24
0.1
Unit
V
mA
µA
V
kΩ
V
kHz
%
V
mA
V
°C
V
V
ms
V
V
V
0.8 V
±2.5
%
240 mA
5 uA
0.9 2.4 V
250 500
kΩ
0.1 2.0 kHz
0.8
V
2.2
30 us
250 500
kΩ
8.5 10 11.5 V
20 mA
20 mA
0.1 0.5
us
0.1 0.5
us
Jun 13th 2013
5 Page 
Confidential
Datasheet Version 1.1
Application Information
CURRENT MODE BOOST SWITCHING
CONTROLLER OPERATION
The MAP3242 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 MAP3242 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.
LED CURRENT ADJUSTMENT
The MAP3242 sets the LED current through the
voltage level on the ADIM pin. ADIM pin voltage vs.
LED current is as following table. A 10kΩ/1% resistor
must be connected between the ISET pin and ground.
ADIM Voltage [V]
0.9
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
LED Current [mA]
90
100
120
140
160
180
200
220
240
The relationship between ADIM pin voltage, RISET
value and LED current is defiend by following equation.
INTERNAL 5V/10V REGULATOR
The MAP3242 has built-in 5V LDO regulator to supply
I
LED
[mA]
=
VADIM [V ]
RISET[kΩ]
×1000
internal analog and logic blocks. The LDO is powered up
when the EN pin is Logic High. A 2.2uF bypass capacitor is
The MAP3242 offers protection functions to limit excess
11
required on the VLDO pin for stable operation of the LDO.
A 10V LDO is used to drive external MOSFET connected
LED current increase at abnormall ISET and ADIM pin
voltage. If the ADIM or ISET pin voltage is at following
to the GATE pin. A 2.2uF bypass capacitor is required on conditions abnormally, the MAP3242 turns off the GATE
the VDD pin for stable operation of the LDO.
output and internal LED current sink MOSFETs.
DIMMING SCHEME
The brightness control of the LEDs is performed by a
pulse-width modulation of the channel current. When a
PWM signal is applied to the PWM pin, the current
generators are turned on and off mirroring the PWM pin
behavior.
When PWM signal stays at low level (<0.8V) for a long
time, the MAP3242 turns off the boost circuitry, but
internal circuit is enabled so the MAP3242 increases
the output voltage promptly.
If the on-time of inputted PWM signal is less than 3
fsw clock, the MAP3242 controls the Min. on-time of
output PWM by 2 or 3 fsw clock to prevent abnormal
turn-off or opreation. For example,
V_ISET ≤ 0.3V
V_ADIM ≥ 3.5V
Some application need to decrease LED current further at
abnormal pin voltage. In this case, a 2.5 ~ 2.7V zener
clamp is recommendable on the ADIM pin like following
circuit.
fsw=100kHz -> tON_MIN =20us to 30us
fsw=500kHz -> tON_MIN =4us to 6us
PARALLEL OPERATION
Even the MAP3242 has 4 channels and 240mA LED
current capability per channel, 2 channels and 480mA
application can be supported by tying 2FBs into 1ch, so
the LED current capability can be increased to 480mA.
Jun 13th 2013
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAP3242.PDF ] | |
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