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PDF MAP3222 Data sheet ( Hoja de datos )
| Número de pieza | MAP3222 | |
| Descripción | Dual Channel High Brightness LED Driver | |
| Fabricantes | MagnaChip | |
| Logotipo |  |
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Confidential
Datasheet Version 1.0
Datasheet - MAP3222
Dual Channel High Brightness LED Driver
General Description
MAP3222 is high efficiency dual channel boost type
PWM driver in single package. It is designed for high
brightness LED driver optimized for backlighting
system for large size LCD module.
MAP3222 offers the function of accurate and fast LED
dimming control using PWM interface and external
dimming MOSFET.
MAP3222 has the over-voltage protection, UVLO,
LED short current and Boost switch current limit
protection.
Features
Dual output into single package
Wide input voltage range up to 20V
PWM Dimming
Current Mode Control Type
Auto Restart Mode Protection
Programmable Output Over Voltage Protection
Programmable LED Short current Protection
Boost switch current limit protection
Power Good
Package : SOIC-20 Pin
MAP3222 is available in SOIC-20 Pin package with
Halogen-free (fully RoHS compliant).
For more information, please contact local MagnaChip
sales office in world-wide or visit MagnaChip’s website
at www.magnachip.com.
Applications
High Brightness white LED backlighting for LCD
TVs and monitors
General LED lighting applications
Ordering Information
Part Number
MAP3222SIRH
Top
Marking
MAP3222
Ambient
Temperature Range
-40℃ to +85℃
Typical Application
Package
SOIC-20 Pin
RoHS Status
Halogen Free
March 2011.
Page 1
1 page  
Confidential
Datasheet Version 1.0
Electrical Characteristics
VCC=12V, VPDIMI=5V, CGATE=CPDIMO=1nF, Ta=25℃, unless otherwise specified
SYMBOL
PARAMETER
TEST CONDITION
MIN TYP MAX UNIT
SUPPLY
VCC,OP
IQ
IOP
VUVLO
Input voltage range
Ta=-40℃ ~ 85℃
Operation quiescent current
PDIMI 1/2 =0V
Operation Current
PDIMI 1/2 =5V
Under-voltage lockout release threshold
-
Under-voltage lockout hysteresis
-
8.7 - 20 V
- 2 4 mA
- - 20 mA
7.7 8.2 8.7
V
- 1 -V
Oscillator
FOSC
Oscillator frequency
DMAX
Maximum duty cycle
GATE (CH1, CH2)
Ta= 25℃
Ta= -40℃ ~ 85℃
-
190 200 210 kHz
180 200 220 kHz
- 90 - %
ISOURCE
ISINK
TRISE
TFALL
Gate short circuit current
Gate sink current
GATE output rise time
GATE output fall time
VGATE=0, VCC =12V
VGATE=12V, VCC =12V
CGATE=1nF, VCC=12V
CGATE=1nF, VCC =12V
0.4 - - A
0.8 - - A
- 50 85 ns
- 25 45 ns
Current Sense (CH1, CH2)
TBLANK
TDELAY
VCS,MAX
Leading Edge Blanking
Delay to output of CS comparator(2)
Maximum CS Voltage
- 100 - 375 ns
VCOMP=5V
VCS=0V to 600mV step pulse
-
- 180 ns
VCC=12V, VADIM – VISEN > 0.2 0.35 0.4 0.45
V
Internal Transconductance Opamp (CH1, CH2)
AV Open loop DC Gain(2)
VCM Input common-mode range
Output Voltage Low Limit
VO
Output Voltage High Limit
Gm Transconductance(2)
IBIAS Input Bias current
- - 70 - dB
- 0.1 - 3.0 V
VCC=12V, VISEN – VADIM > 0.2 - 0.6 -
V
VCC=12V, VADIM – VISEN > 0.2 - 2.6 -
V
- 400 670 1000 uA/V
- - 0.5 1 nA
March 2011.
Page 5
5 Page 
Confidential
3. Output Over Voltage Protection (OVP)
When MAP3222’s output voltage is increased abnormally,
MAP3222 stops the switching to protect external components.
Datasheet Version 1.0
Fig 3. Schematic for Over voltage protection
MAP3222 has 200nS (Typ.) low pass filter on OVP pin, but
using external Capacitor (Ca) is recommended to minimize
noise. The total values of R1 and R2 need to be lower than
1Mohm.
OVP threshold voltage is 3.0V and OVP voltage can be set
as below.
- OVP set voltage :
VO1
=
3.0
×
R1 + R2
R2
- OVP release voltage :
VO1
=
2.7
×
R1 + R2
R2
Ch1: OVP, Ch2: Gate, Ch3: Vout
Fig 4. OVP Waveform
4. LED Short Current Protection (SCP)
To protect external components, MAP3222 has the LED short
protection. If the LED SCP threshold voltage changes based
on ADIM voltage as below, so if ISEN voltage is higher than
LED SCP threshold voltage, MAP3222 will be in LED SCP
mode disabling gate for boost MOSFET and dimming
MOSFET.
.
Fig 5. SCP threshold voltage based on ADIM voltage
Ch1: ISEN, Ch2: GATE, Ch3: PWMO, Ch3: I_LED
Fig 6. LED SCP waveform
5. Auto-Restart Protection
The MAP3222 offers Auto Restart protection function
which is recovered into normal operation mode when
protection condition is cleared. The auto restart time (TAR)
is fixed at 1mS,
It is recovered to normal operating mode if SCP or OVP
condition is cleared.
6. Power Good (PGOOD)
MAP3222 has the PGOOD pin to send out the LED
current status. PGOOD will be high when the LED current
is higher than 70% of normal LED current and will be low
when the LED current is below 70%.
March 2011.
Page 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAP3222.PDF ] | |
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